BlackTreeIndependent security intelligence
← Back to the CVE catalogue
Full vulnerability report · 2025
CVE-2022-49065High confidence

SUNRPC: Fix the svc_deferred_event trace class

Linux · Linux

7.5HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

1 package state
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Ubuntu releaseSource packageVendor stateFixed versionEvidence
Ubuntu 24.04 LTSnoble · standard archivelinux-raspi-realtimeAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2022-49065 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitykernel: SUNRPC: Fix the svc_deferred_event trace class
198 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • kernel as a component of Red Hat Enterprise Linux 6
  • kernel-abi-whitelists as a component of Red Hat Enterprise Linux 6
  • kernel-bootwrapper as a component of Red Hat Enterprise Linux 6
  • kernel-debug as a component of Red Hat Enterprise Linux 6
  • kernel-debug-devel as a component of Red Hat Enterprise Linux 6
  • kernel-devel as a component of Red Hat Enterprise Linux 6
  • kernel-doc as a component of Red Hat Enterprise Linux 6
  • kernel-firmware as a component of Red Hat Enterprise Linux 6
  • kernel-headers as a component of Red Hat Enterprise Linux 6
  • kernel-kdump as a component of Red Hat Enterprise Linux 6
  • kernel-kdump-devel as a component of Red Hat Enterprise Linux 6
  • kernel.src as a component of Red Hat Enterprise Linux 6
Summary
A flaw was found in the Linux kernel's SUNRPC subsystem. When the SUNRPC tracing subsystem is enabled, a NULL pointer dereference can occur if an `svc_rqst` is deferred. This vulnerability could allow a local attacker to cause a system crash, leading to a denial of service (DoS).
Remediation
Fix deferred
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2022-55139

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Fix the svc_deferred_event trace class Fix a NULL deref crash that occurs when an svc_rqst is deferred while the sunrpc tracing subsystem is enabled. svc_revisit() sets dr->xprt to NULL, so it can't be relied upon in the tracepoint to provide the remote's address. Unfortunately we can't revert the "svc_deferred_class" hunk in commit ece200ddd54b ("sunrpc: Save remote presentation address in svc_xprt for trace events") because there is now a specific check of event format specifiers for unsafe dereferences. The warning that check emits is: event svc_defer_recv has unsafe dereference of argument 1 A "%pISpc" format specifier with a "struct sockaddr *" is indeed flagged by this check. Instead, take the brute-force approach used by the svcrdma_qp_error tracepoint. Convert the dr::addr field into a presentation address in the TP_fast_assign() arm of the trace event, and store that as a string. This fix can be backported to -stable kernels. In the meantime, commit c6ced22997ad ("tracing: Update print fmt check to handle new __get_sockaddr() macro") is now in v5.18, so this wonky fix can be replaced with __sockaddr() and friends properly during the v5.19 merge window.

What

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Fix the svc_deferred_event trace class Fix a NULL deref crash that occurs when an svc_rqst is deferred while the sunrpc tracing subsystem is enabled. svc_revisit() sets dr->xprt to NULL, so it can't be relied upon in the tracepoint to provide the remote's address. Unfortunately we can't revert the "svc_deferred_class" hunk in commit ece200ddd54b ("sunrpc: Save remote presentation address in svc_xprt for trace events") because there is now a specific check of event format specifiers for unsafe dereferences. The warning that check emits is: event svc_defer_recv has unsafe dereference of argument 1 A "%pISpc" format specifier with a "struct sockaddr *" is indeed flagged by this check. Instead, take the brute-force approach used by the svcrdma_qp_error tracepoint. Convert the dr::addr field into a presentation address in the TP_fast_assign() arm of the trace event, and store that as a string. This fix can be backported to -stable kernels. In the meantime, commit c6ced22997ad ("tracing: Update print fmt check to handle new __get_sockaddr() macro") is now in v5.18, so this wonky fix can be replaced with __sockaddr() and friends properly during the v5.19 merge window.

Why

The product dereferences a pointer that it expects to be valid but is NULL.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Fix the svc_deferred_event trace class Fix a NULL deref crash that occurs when an svc_rqst is deferred while the sunrpc tracing subsystem is enabled. svc_revisit() sets dr->xprt to NULL, so it can't be relied upon in the tracepoint to provide the remote's address. Unfortunately we can't revert the "svc_deferred_class" hunk in commit ece200ddd54b ("sunrpc: Save remote presentation address in svc_xprt for trace events") because there is now a specific check of event format specifiers for unsafe dereferences. The warning that check emits is: event svc_defer_recv has unsafe dereference of argument 1 A "%pISpc" format specifier with a "struct sockaddr *" is indeed flagged by this check. Instead, take the brute-force approach used by the svcrdma_qp_error tracepoint. Convert the dr::addr field into a presentation address in the TP_fast_assign() arm of the trace event, and store that as a string. This fix can be backported to -stable kernels. In the meantime, commit c6ced22997ad ("tracing: Update print fmt check to handle new __get_sockaddr() macro") is now in v5.18, so this wonky fix can be replaced with __sockaddr() and friends properly during the v5.19 merge window.

Why

The product dereferences a pointer that it expects to be valid but is NULL.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → NULL Pointer Dereference → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-476 ↗

CWE-476: NULL Pointer Dereference. The product dereferences a pointer that it expects to be valid but is NULL.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-476
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

CERT-FR · French · CERTFR-2025-AVI-1057Multiples vulnérabilités dans les produits VMware

d?id=CVE-2022-49043 Référence CVE CVE-2022-49048 https://www.cve.org/CVERecord?id=CVE-2022-49048 Référence CVE CVE-2022-49049 https://www.cve.org/CVERecord?id=CVE-2022-49049 Référence CVE CVE-2022-49052 https://www.cve.org/CVERecord?id=CVE-2022-49052 Référence CVE CVE-2022-49057 https://www.cve.org/CVERecord?id=CVE-2022-49057 Référence CVE CVE-2022-49058 https://www.cve.org/CVERecord?id=CVE-2022-49058 Référence CVE CVE-2022-49061 https://www.cve.org/CVERecord?id=CVE-2022-49061 Référence CVE CVE-2022-49062 https://www.cve.org/CVERecord?id=CVE-2022-49062 Référence CVE CVE-2022-49064 https://www.cve.org/CVERecord?id=CVE-2022-49064 Référence CVE CVE-2022-49065 https://www.cve.org/CVERecord?id=CVE-2022-49065 Référence CVE CVE-2022-49066 https://www.cve.org/CVERecord?id=CVE-2022-49066 Référence CVE CVE-2022-49070 https://www.cve.org/CVERecord?id=CVE-2022-49070 Référence CVE CVE-2022-49072 https://www.cve.org/CVERecord?id=CVE-2022-49072 Référence CVE CVE-2022-49074 https://www.cve.org/CVERecord?id=CVE-2022-49074 Référence CVE CVE-2022-49077 https://www.cve.org/CVERecord?id=CVE-2022-49077 Référence CVE CVE-2022-49080 https://www.cve.org/CVERecord?id=CVE-2022-49080 Référence CVE CVE-2022-49086 https://www.cve.org/CVERecord?id=CVE-2022-49086 Référence CVE CVE-2022-49089 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2025-AVI-0336Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2022-49056 Référence CVE CVE-2022-49057 https://www.cve.org/CVERecord?id=CVE-2022-49057 Référence CVE CVE-2022-49058 https://www.cve.org/CVERecord?id=CVE-2022-49058 Référence CVE CVE-2022-49059 https://www.cve.org/CVERecord?id=CVE-2022-49059 Référence CVE CVE-2022-49060 https://www.cve.org/CVERecord?id=CVE-2022-49060 Référence CVE CVE-2022-49061 https://www.cve.org/CVERecord?id=CVE-2022-49061 Référence CVE CVE-2022-49062 https://www.cve.org/CVERecord?id=CVE-2022-49062 Référence CVE CVE-2022-49063 https://www.cve.org/CVERecord?id=CVE-2022-49063 Référence CVE CVE-2022-49064 https://www.cve.org/CVERecord?id=CVE-2022-49064 Référence CVE CVE-2022-49065 https://www.cve.org/CVERecord?id=CVE-2022-49065 Référence CVE CVE-2022-49066 https://www.cve.org/CVERecord?id=CVE-2022-49066 Référence CVE CVE-2022-49070 https://www.cve.org/CVERecord?id=CVE-2022-49070 Référence CVE CVE-2022-49071 https://www.cve.org/CVERecord?id=CVE-2022-49071 Référence CVE CVE-2022-49073 https://www.cve.org/CVERecord?id=CVE-2022-49073 Référence CVE CVE-2022-49074 https://www.cve.org/CVERecord?id=CVE-2022-49074 Référence CVE CVE-2022-49075 https://www.cve.org/CVERecord?id=CVE-2022-49075 Référence CVE CVE-2022-49076 https://www.cve.org/CVERecord?id=CVE-2022-49076 Référence CVE CVE-2022-49078 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2025-AVI-0307Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2022-49056 Référence CVE CVE-2022-49057 https://www.cve.org/CVERecord?id=CVE-2022-49057 Référence CVE CVE-2022-49058 https://www.cve.org/CVERecord?id=CVE-2022-49058 Référence CVE CVE-2022-49059 https://www.cve.org/CVERecord?id=CVE-2022-49059 Référence CVE CVE-2022-49060 https://www.cve.org/CVERecord?id=CVE-2022-49060 Référence CVE CVE-2022-49061 https://www.cve.org/CVERecord?id=CVE-2022-49061 Référence CVE CVE-2022-49062 https://www.cve.org/CVERecord?id=CVE-2022-49062 Référence CVE CVE-2022-49063 https://www.cve.org/CVERecord?id=CVE-2022-49063 Référence CVE CVE-2022-49064 https://www.cve.org/CVERecord?id=CVE-2022-49064 Référence CVE CVE-2022-49065 https://www.cve.org/CVERecord?id=CVE-2022-49065 Référence CVE CVE-2022-49066 https://www.cve.org/CVERecord?id=CVE-2022-49066 Référence CVE CVE-2022-49070 https://www.cve.org/CVERecord?id=CVE-2022-49070 Référence CVE CVE-2022-49071 https://www.cve.org/CVERecord?id=CVE-2022-49071 Référence CVE CVE-2022-49073 https://www.cve.org/CVERecord?id=CVE-2022-49073 Référence CVE CVE-2022-49074 https://www.cve.org/CVERecord?id=CVE-2022-49074 Référence CVE CVE-2022-49075 https://www.cve.org/CVERecord?id=CVE-2022-49075 Référence CVE CVE-2022-49076 https://www.cve.org/CVERecord?id=CVE-2022-49076 Référence CVE CVE-2022-49078 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2025-AVI-0252Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2022-49050 Référence CVE CVE-2022-49051 https://www.cve.org/CVERecord?id=CVE-2022-49051 Référence CVE CVE-2022-49054 https://www.cve.org/CVERecord?id=CVE-2022-49054 Référence CVE CVE-2022-49055 https://www.cve.org/CVERecord?id=CVE-2022-49055 Référence CVE CVE-2022-49058 https://www.cve.org/CVERecord?id=CVE-2022-49058 Référence CVE CVE-2022-49059 https://www.cve.org/CVERecord?id=CVE-2022-49059 Référence CVE CVE-2022-49060 https://www.cve.org/CVERecord?id=CVE-2022-49060 Référence CVE CVE-2022-49061 https://www.cve.org/CVERecord?id=CVE-2022-49061 Référence CVE CVE-2022-49063 https://www.cve.org/CVERecord?id=CVE-2022-49063 Référence CVE CVE-2022-49065 https://www.cve.org/CVERecord?id=CVE-2022-49065 Référence CVE CVE-2022-49066 https://www.cve.org/CVERecord?id=CVE-2022-49066 Référence CVE CVE-2022-49073 https://www.cve.org/CVERecord?id=CVE-2022-49073 Référence CVE CVE-2022-49074 https://www.cve.org/CVERecord?id=CVE-2022-49074 Référence CVE CVE-2022-49076 https://www.cve.org/CVERecord?id=CVE-2022-49076 Référence CVE CVE-2022-49078 https://www.cve.org/CVERecord?id=CVE-2022-49078 Référence CVE CVE-2022-49082 https://www.cve.org/CVERecord?id=CVE-2022-49082 Référence CVE CVE-2022-49083 https://www.cve.org/CVERecord?id=CVE-2022-49083 Référence CVE CVE-2022-49084 https://www.cve.org/CVERecord?id=

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
kernel as a component of Red Hat Enterprise Linux 6; kernel-abi-whitelists as a component of Red Hat Enterprise Linux 6; kernel-bootwrapper as a component of Red Hat Enterprise Linux 6; kernel-debug as a component of Red Hat Enterprise Linux 6; kernel-debug-devel as a component of Red Hat Enterprise Linux 6; kernel-devel as a component of Red Hat Enterprise Linux 6; kernel-doc as a component of Red Hat Enterprise Linux 6; kernel-firmware as a component of Red Hat Enterprise Linux 6; kernel-headers as a component of Red Hat Enterprise Linux 6; kernel-kdump as a component of Red Hat Enterprise Linux 6; kernel-kdump-devel as a component of Red Hat Enterprise Linux 6; kernel.src as a component of Red Hat Enterprise Linux 6; perf as a component of Red Hat Enterprise Linux 6; python-perf as a component of Red Hat Enterprise Linux 6; bpftool as a component of Red Hat Enterprise Linux 7; kernel as a component of Red Hat Enterprise Linux 7; kernel-abi-whitelists as a component of Red Hat Enterprise Linux 7; kernel-bootwrapper as a component of Red Hat Enterprise Linux 7; kernel-debug as a component of Red Hat Enterprise Linux 7; kernel-debug-devel as a component of Red Hat Enterprise Linux 7; kernel-devel as a component of Red Hat Enterprise Linux 7; kernel-doc as a component of Red Hat Enterprise Linux 7; kernel-headers as a component of Red Hat Enterprise Linux 7; kernel-kdump as a component of Red Hat Enterprise Linux 7; kernel-kdump-devel as a component of Red Hat Enterprise Linux 7; kernel-rt as a component of Red Hat Enterprise Linux 7; kernel-rt-debug as a component of Red Hat Enterprise Linux 7; kernel-rt-debug-devel as a component of Red Hat Enterprise Linux 7; kernel-rt-debug-kvm as a component of Red Hat Enterprise Linux 7; kernel-rt-devel as a component of Red Hat Enterprise Linux 7; and 168 more
Fixed
< 4.17; 5.10.112 ≤ 5.10.*; 5.15.35 ≤ 5.15.*; 5.17.4 ≤ 5.17.*; 5.18 ≤ *
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 26 Feb 2025 · Last source change 5 Aug 2026, 08:53 UTC · CWE-476 · NULL Pointer Dereference

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2022-55139
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCISA ADP
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2022-55139↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference↗Patch or update reference↗Patch or update reference↗Patch or update reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2022-49065 · cve.blacktree.nl