n/a: Loop with Unreachable Exit Condition ('Infinite Loop')
n/a · n/a
9.8CriticalCVSS 3.1
Recommended action
Within 72 hours
Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.
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 release
Source package
Vendor state
Fixed version
Evidence
Ubuntu 24.04 LTSnoble · standard archive
linux-raspi-realtime
Affected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.
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-2018-13327
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 72 hours
Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.
Patch available
01
What, why and how
In the Linux kernel before 4.20.2, kernel/sched/fair.c mishandles leaf cfs_rq's, which allows attackers to cause a denial of service (infinite loop in update_blocked_averages) or possibly have unspecified other impact by inducing a high load.
What
In the Linux kernel before 4.20.2, kernel/sched/fair.c mishandles leaf cfs_rq's, which allows attackers to cause a denial of service (infinite loop in update_blocked_averages) or possibly have unspecified other impact by inducing a high load.
Why
A malformed condition prevents a loop from making progress or terminating, allowing resource exhaustion.
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 before 4.20.2, kernel/sched/fair.c mishandles leaf cfs_rq's, which allows attackers to cause a denial of service (infinite loop in update_blocked_averages) or possibly have unspecified other impact by inducing a high load.
Why
A malformed condition prevents a loop from making progress or terminating, allowing resource exhaustion.
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 → Loop with Unreachable Exit Condition ('Infinite Loop') → 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-835: Loop with Unreachable Exit Condition ('Infinite Loop'). The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.
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:H/I:H/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.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.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-835
A
Official authority intelligence
Only matched European and national findings are included. Language selectors and unavailable sources are omitted.
ENISA EUVD · EUVD-2018-13327Official EUVD mapping
0 linked advisory records.
Official EUVD record ↗CERT-FR · French · CERTFR-2023-AVI-0664Multiples vulnérabilités dans le noyau Linux de SUSE
su-20233318-1/
Bulletin de sécurité SUSE SUSE-SU-2023:3324-1 du 16 août 2023
https://www.suse.com/support/update/announcement/2023/suse-su-20233324-1/
Bulletin de sécurité SUSE SUSE-SU-2023:3329-1 du 16 août 2023
https://www.suse.com/support/update/announcement/2023/suse-su-20233329-1/
Bulletin de sécurité SUSE SUSE-SU-2023:3333-1 du 16 août 2023
https://www.suse.com/support/update/announcement/2023/suse-su-20233333-1/
Bulletin de sécurité SUSE SUSE-SU-2023:3349-1 du 17 août 2023
https://www.suse.com/support/update/announcement/2023/suse-su-20233349-1/
Référence CVE CVE-2017-18344
https://www.cve.org/CVERecord?id=CVE-2017-18344
Référence CVE CVE-2018-20784
https://www.cve.org/CVERecord?id=CVE-2018-20784
Référence CVE CVE-2018-3639
https://www.cve.org/CVERecord?id=CVE-2018-3639
Référence CVE CVE-2022-40982
https://www.cve.org/CVERecord?id=CVE-2022-40982
Référence CVE CVE-2022-45919
https://www.cve.org/CVERecord?id=CVE-2022-45919
Référence CVE CVE-2023-0459
https://www.cve.org/CVERecord?id=CVE-2023-0459
Référence CVE CVE-2023-1637
https://www.cve.org/CVERecord?id=CVE-2023-1637
Référence CVE CVE-2023-1829
https://www.cve.org/CVERecord?id=CVE-2023-1829
Référence CVE CVE-2023-20569
https://www.cve.org/CVERecord?id=CVE-2023-20569
Référence CVE CVE-2023-20593
https://www.cve.org/CVERecord?id=CVE-2023
Official advisory ↗CERT-FR · French · CERTFR-2023-AVI-0544Multiples vulnérabilités dans le noyau Linux de SUSE
4-1/
Bulletin de sécurité SUSE SUSE-SU-2023:2805-1 du 11 juillet 2023
https://www.suse.com/support/update/announcement/2023/suse-su-20232805-1/
Bulletin de sécurité SUSE SUSE-SU-2023:2808-1 du 11 juillet 2023
https://www.suse.com/support/update/announcement/2023/suse-su-20232808-1/
Bulletin de sécurité SUSE SUSE-SU-2023:2809-1 du 11 juillet 2023
https://www.suse.com/support/update/announcement/2023/suse-su-20232809-1/
Bulletin de sécurité SUSE SUSE-SU-2023:2810-1 du 12 juillet 2023
https://www.suse.com/support/update/announcement/2023/suse-su-20232810-1/
Référence CVE CVE-2017-5753
https://www.cve.org/CVERecord?id=CVE-2017-5753
Référence CVE CVE-2018-20784
https://www.cve.org/CVERecord?id=CVE-2018-20784
Référence CVE CVE-2020-24588
https://www.cve.org/CVERecord?id=CVE-2020-24588
Référence CVE CVE-2022-2196
https://www.cve.org/CVERecord?id=CVE-2022-2196
Référence CVE CVE-2022-3523
https://www.cve.org/CVERecord?id=CVE-2022-3523
Référence CVE CVE-2022-3566
https://www.cve.org/CVERecord?id=CVE-2022-3566
Référence CVE CVE-2022-36280
https://www.cve.org/CVERecord?id=CVE-2022-36280
Référence CVE CVE-2022-38096
https://www.cve.org/CVERecord?id=CVE-2022-38096
Référence CVE CVE-2022-4269
https://www.cve.org/CVERecord?id=CVE-2022-4269
Référence CVE CVE-2022-45884
https://www.cve.org/CVERecord?id=CVE-2022
Official advisory ↗CERT-FR · French · CERTFR-2022-AVI-555Multiples vulnérabilités dans le noyau Linux de SUSE
su-20222079- du 14 juin 2022
https://www.suse.com/support/update/announcement/2022/suse-su-20222079-1/
Bulletin de sécurité le noyau Linux de SUSE suse-su-20222080- du 14 juin 2022
https://www.suse.com/support/update/announcement/2022/suse-su-20222080-1/
Bulletin de sécurité le noyau Linux de SUSE suse-su-20222082- du 14 juin 2022
https://www.suse.com/support/update/announcement/2022/suse-su-20222082-1/
Bulletin de sécurité le noyau Linux de SUSE suse-su-20222083- du 14 juin 2022
https://www.suse.com/support/update/announcement/2022/suse-su-20222083-1/
Référence CVE CVE-2017-13695
https://www.cve.org/CVERecord?id=CVE-2017-13695
Référence CVE CVE-2018-20784
https://www.cve.org/CVERecord?id=CVE-2018-20784
Référence CVE CVE-2018-7755
https://www.cve.org/CVERecord?id=CVE-2018-7755
Référence CVE CVE-2019-19377
https://www.cve.org/CVERecord?id=CVE-2019-19377
Référence CVE CVE-2019-20811
https://www.cve.org/CVERecord?id=CVE-2019-20811
Référence CVE CVE-2020-10769
https://www.cve.org/CVERecord?id=CVE-2020-10769
Référence CVE CVE-2021-20292
https://www.cve.org/CVERecord?id=CVE-2021-20292
Référence CVE CVE-2021-20321
https://www.cve.org/CVERecord?id=CVE-2021-20321
Référence CVE CVE-2021-28688
https://www.cve.org/CVERecord?id=CVE-2021-28688
Référence CVE CVE-2021-33061
https://www.cve.org/CVERecord?id=CV
Official advisory ↗CERT-FR · French · CERTFR-2019-AVI-419Multiples vulnérabilités dans le noyau Linux d'Ubuntu
Official advisory ↗CERT-FR · French · CERTFR-2019-AVI-361Multiples vulnérabilités dans le noyau Linux de Red Hat
De multiples vulnérabilités ont été découvertes dans le noyau Linux de
Red Hat. Elles permettent à un attaquant de provoquer un problème de
sécurité non spécifié par l'éditeur, une élévation de privilèges et un
déni de service à distance.
Official advisory ↗JVN iPedia · Japanese · JVNDB-2018-014607Linux Kernel におけるリソースの枯渇に関する脆弱性
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.
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 22 Feb 2019 · Last source change 5 Aug 2024, 12:12 UTC · CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
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 2026-09-01
European sourceENISA EUVD · EUVD-2018-13327
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceNIST NVD
NVD statusNVD modified after enrichment
Core structured fields are present and their contributing authorities are shown above.
Affected versionsThe structured affected or fixed version information changed.
Before
n/a · Fixed: No fixed version is explicitly recorded in the structured CVE data.
After
n/a · 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.
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.