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Full vulnerability report · 2022
CVE-2022-1204High confidence

A use-after-free flaw was found in the Linux kernel’s Amateur Radio AX.25 protocol functionality in the way a user connects with the protocol

Unknown · Kernel

5.5MediumCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 0.40% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Unknown Kernel and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

5 package states
Package result overrides the generic status

BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 1 affected package state shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.

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.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.5.17.3-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.5.17.3-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.5.17.3-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.5.17.3-1Debian Security Tracker ↗Source updated 6 Oct 2026
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 Ubuntu Security ↗Source updated 5 Oct 2026
Optional official sources

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

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

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-2022-24544

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 actionPatch only the product branches with a verified fix

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

A use-after-free flaw was found in the Linux kernel’s Amateur Radio AX.25 protocol functionality in the way a user connects with the protocol. This flaw allows a local user to crash the system.

What

A use-after-free flaw was found in the Linux kernel’s Amateur Radio AX.25 protocol functionality in the way a user connects with the protocol. This flaw allows a local user to crash the system.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may disrupt the affected service.

What

A use-after-free flaw was found in the Linux kernel’s Amateur Radio AX.25 protocol functionality in the way a user connects with the protocol. This flaw allows a local user to crash the system.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

How

An attacker operating through local access may attempt exploitation with low privileges. 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.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
local access → Use After Free → disrupt the affected service
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
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-416 ↗

CWE-416: Use After Free. The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:L/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.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level 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
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
Denial of serviceCWE-416Public exploit reference
A

Official authority intelligence

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

BSI · German · WID-SEC-2022-0162Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Ein lokaler Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um einen Denial of Service Angriff durchzuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20220831Security Bulletin 31 Aug 2022

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 31 Aug 2022, published on 31 August 2022. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-878Multiples vulnérabilités dans le noyau Linux d'Ubuntu

30 septembre 2022 https://ubuntu.com/security/notices/USN-5650-1 Bulletin de sécurité Ubuntu du 30 septembre 2022 https://ubuntu.com/security/notices/USN-5652-1 Bulletin de sécurité Ubuntu du 30 septembre 2022 https://ubuntu.com/security/notices/USN-5648-1 Référence CVE CVE-2021-33655 https://www.cve.org/CVERecord?id=CVE-2021-33655 Référence CVE CVE-2021-33656 https://www.cve.org/CVERecord?id=CVE-2021-33656 Référence CVE CVE-2021-4037 https://www.cve.org/CVERecord?id=CVE-2021-4037 Référence CVE CVE-2022-0850 https://www.cve.org/CVERecord?id=CVE-2022-0850 Référence CVE CVE-2022-1199 https://www.cve.org/CVERecord?id=CVE-2022-1199 Référence CVE CVE-2022-1204 https://www.cve.org/CVERecord?id=CVE-2022-1204 Référence CVE CVE-2022-1729 https://www.cve.org/CVERecord?id=CVE-2022-1729 Référence CVE CVE-2022-20368 https://www.cve.org/CVERecord?id=CVE-2022-20368 Référence CVE CVE-2022-2318 https://www.cve.org/CVERecord?id=CVE-2022-2318 Référence CVE CVE-2022-26365 https://www.cve.org/CVERecord?id=CVE-2022-26365 Référence CVE CVE-2022-2639 https://www.cve.org/CVERecord?id=CVE-2022-2639 Référence CVE CVE-2022-2964 https://www.cve.org/CVERecord?id=CVE-2022-2964 Référence CVE CVE-2022-2978 https://www.cve.org/CVERecord?id=CVE-2022-2978 Référence CVE CVE-2022-3028 https://www.cve.org/CVERecord?id=CVE-2022-302

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-689Multiples vulnérabilités dans le noyau Linux d'Ubuntu

De multiples vulnérabilités ont été découvertes dans le noyau Linux d'Ubuntu. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire, un déni de service à distance et une atteinte à l'intégrité des données.

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-645Multiples vulnérabilités dans le noyau Linux d'Ubuntu

cve.org/CVERecord?id=CVE-2021-39714 Référence CVE CVE-2021-4197 https://www.cve.org/CVERecord?id=CVE-2021-4197 Référence CVE CVE-2021-4202 https://www.cve.org/CVERecord?id=CVE-2021-4202 Référence CVE CVE-2022-0330 https://www.cve.org/CVERecord?id=CVE-2022-0330 Référence CVE CVE-2022-0500 https://www.cve.org/CVERecord?id=CVE-2022-0500 Référence CVE CVE-2022-1011 https://www.cve.org/CVERecord?id=CVE-2022-1011 Référence CVE CVE-2022-1195 https://www.cve.org/CVERecord?id=CVE-2022-1195 Référence CVE CVE-2022-1198 https://www.cve.org/CVERecord?id=CVE-2022-1198 Référence CVE CVE-2022-1199 https://www.cve.org/CVERecord?id=CVE-2022-1199 Référence CVE CVE-2022-1204 https://www.cve.org/CVERecord?id=CVE-2022-1204 Référence CVE CVE-2022-1205 https://www.cve.org/CVERecord?id=CVE-2022-1205 Référence CVE CVE-2022-1353 https://www.cve.org/CVERecord?id=CVE-2022-1353 Référence CVE CVE-2022-1419 https://www.cve.org/CVERecord?id=CVE-2022-1419 Référence CVE CVE-2022-1516 https://www.cve.org/CVERecord?id=CVE-2022-1516 Référence CVE CVE-2022-1652 https://www.cve.org/CVERecord?id=CVE-2022-1652 Référence CVE CVE-2022-1679 https://www.cve.org/CVERecord?id=CVE-2022-1679 Référence CVE CVE-2022-1734 https://www.cve.org/CVERecord?id=CVE-2022-1734 Référence CVE CVE-2022-1789 https://www.cve.org/CVERecord?id=CVE-2022-1789 Ré

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-606Multiples vulnérabilités dans le noyau Linux de Debian

.cve.org/CVERecord?id=CVE-2022-0854 Référence CVE CVE-2022-1011 https://www.cve.org/CVERecord?id=CVE-2022-1011 Référence CVE CVE-2022-1012 https://www.cve.org/CVERecord?id=CVE-2022-1012 Référence CVE CVE-2022-1016 https://www.cve.org/CVERecord?id=CVE-2022-1016 Référence CVE CVE-2022-1048 https://www.cve.org/CVERecord?id=CVE-2022-1048 Référence CVE CVE-2022-1184 https://www.cve.org/CVERecord?id=CVE-2022-1184 Référence CVE CVE-2022-1195 https://www.cve.org/CVERecord?id=CVE-2022-1195 Référence CVE CVE-2022-1198 https://www.cve.org/CVERecord?id=CVE-2022-1198 Référence CVE CVE-2022-1199 https://www.cve.org/CVERecord?id=CVE-2022-1199 Référence CVE CVE-2022-1204 https://www.cve.org/CVERecord?id=CVE-2022-1204 Référence CVE CVE-2022-1205 https://www.cve.org/CVERecord?id=CVE-2022-1205 Référence CVE CVE-2022-1353 https://www.cve.org/CVERecord?id=CVE-2022-1353 Référence CVE CVE-2022-1419 https://www.cve.org/CVERecord?id=CVE-2022-1419 Référence CVE CVE-2022-1516 https://www.cve.org/CVERecord?id=CVE-2022-1516 Référence CVE CVE-2022-1652 https://www.cve.org/CVERecord?id=CVE-2022-1652 Référence CVE CVE-2022-1729 https://www.cve.org/CVERecord?id=CVE-2022-1729 Référence CVE CVE-2022-1734 https://www.cve.org/CVERecord?id=CVE-2022-1734 Référence CVE CVE-2022-1974 https://www.cve.org/CVERecord?id=CVE-2022-1974 Ré

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-527Multiples vulnérabilités dans le noyau Linux d'Ubuntu

.cve.org/CVERecord?id=CVE-2022-0168 Référence CVE CVE-2022-1011 https://www.cve.org/CVERecord?id=CVE-2022-1011 Référence CVE CVE-2022-1012 https://www.cve.org/CVERecord?id=CVE-2022-1012 Référence CVE CVE-2022-1016 https://www.cve.org/CVERecord?id=CVE-2022-1016 Référence CVE CVE-2022-1048 https://www.cve.org/CVERecord?id=CVE-2022-1048 Référence CVE CVE-2022-1158 https://www.cve.org/CVERecord?id=CVE-2022-1158 Référence CVE CVE-2022-1195 https://www.cve.org/CVERecord?id=CVE-2022-1195 Référence CVE CVE-2022-1198 https://www.cve.org/CVERecord?id=CVE-2022-1198 Référence CVE CVE-2022-1199 https://www.cve.org/CVERecord?id=CVE-2022-1199 Référence CVE CVE-2022-1204 https://www.cve.org/CVERecord?id=CVE-2022-1204 Référence CVE CVE-2022-1205 https://www.cve.org/CVERecord?id=CVE-2022-1205 Référence CVE CVE-2022-1263 https://www.cve.org/CVERecord?id=CVE-2022-1263 Référence CVE CVE-2022-1353 https://www.cve.org/CVERecord?id=CVE-2022-1353 Référence CVE CVE-2022-1419 https://www.cve.org/CVERecord?id=CVE-2022-1419 Référence CVE CVE-2022-1516 https://www.cve.org/CVERecord?id=CVE-2022-1516 Référence CVE CVE-2022-1651 https://www.cve.org/CVERecord?id=CVE-2022-1651 Référence CVE CVE-2022-1671 https://www.cve.org/CVERecord?id=CVE-2022-1671 Référence CVE CVE-2022-1734 https://www.cve.org/CVERecord?id=CVE-2022-1734 Ré

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-415Multiples vulnérabilités dans le noyau Linux de Debian

De multiples vulnérabilités ont été découvertes dans le noyau Linux de Debian. Elles permettent à un attaquant de provoquer un déni de service, une atteinte à la confidentialité des données et une élévation de privilèges.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2022-017982Linux の Linux Kernel 他複数ベンダの製品における解放済みメモリの使用に関する脆弱性

Linux の Linux Kernel 他複数ベンダの製品には、解放済みメモリの使用に関する脆弱性が存在します。

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.
Fix availability varies by product
Affected
Kernel: Not-Known.
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 29 Aug 2022 · Last source change 2 Aug 2024, 23:55 UTC · CWE-416 · Use After Free

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
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-2022-24544
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD modified after enrichment

Missing structured fields: affected product. Missing data is not evidence of low risk; review the primary advisory.

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
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-2022-1204 · cve.blacktree.nl