The decode_data function in drivers/net/hamradio/6pack.c in the Linux kernel before 5.13.13 has a slab out-of-bounds write
Unknown · Unknown
7.8HighCVSS 3.1
Recommended action
Patch only the product branches with a verified fix
High 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.
Published severityHigh→Operational priority:High, 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 1.56% 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
Confirm that the asset runs Unknown Unknown and falls inside the recorded affected range.
Verify the installed build against the product-specific fixed version after deployment.
Validate exposure, authentication requirements and compensating controls in the actual environment.
Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
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.
Canonical Ubuntu Security: 1 affected package state with no published fix
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 release
Source package
Vendor state
Fixed version
Evidence
Debian trixietrixie · source
linux
Vendor fix publishedDebian records a fixed source-package version for this release.
Affected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
The vendor explicitly identifies these products as affected by this CVE.
SLES 15 SP1 CHOST Images for Amazon EC2
SLES 15 SP2 CHOST Images for Amazon EC2
SLES 15 SP3 CHOST Images for Amazon EC2
SLES 15 SP4 CHOST Images for Amazon EC2
SLES 15 SP5 CHOST Images for Amazon EC2
SLES 15 SP1 CHOST Images for Google
SLES 15 SP2 CHOST Images for Google
SLES 15 SP3 CHOST Images for Google
SLES 15 SP4 CHOST Images for Google
SLES 15 SP5 CHOST Images for Google
SLES 15 SP1 CHOST Images for Microsoft Azure
SLES 15 SP2 CHOST Images for Microsoft Azure
Summary
The decode_data function in drivers/net/hamradio/6pack.c in the Linux kernel before 5.13.13 has a slab out-of-bounds write. Input from a process that has the CAP_NET_ADMIN capability can lead to root access.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
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-2021-28998
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
High 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
The decode_data function in drivers/net/hamradio/6pack.c in the Linux kernel before 5.13.13 has a slab out-of-bounds write. Input from a process that has the CAP_NET_ADMIN capability can lead to root access.
What
The decode_data function in drivers/net/hamradio/6pack.c in the Linux kernel before 5.13.13 has a slab out-of-bounds write. Input from a process that has the CAP_NET_ADMIN capability can lead to root access.
Why
A bounds error lets data be written beyond the intended memory region, potentially corrupting control data.
How
An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
The decode_data function in drivers/net/hamradio/6pack.c in the Linux kernel before 5.13.13 has a slab out-of-bounds write. Input from a process that has the CAP_NET_ADMIN capability can lead to root access.
Why
A bounds error lets data be written beyond the intended memory region, potentially corrupting control data.
How
An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
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 → Out-of-bounds Write → cause the confidentiality, integrity or availability impact described by the vendor
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-787: Out-of-bounds Write. The product writes data past the end, or before the beginning, of the intended buffer.
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:H/I:H/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.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
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
CWE-787Public exploit reference
A
Official authority intelligence
Only matched European and national findings are included. Language selectors and unavailable sources are omitted.
ENISA EUVD · EUVD-2021-28998Official EUVD mapping
0 linked advisory records.
Official EUVD record ↗Cyber Security Agency of Singapore · English · CSA-SB-20211006Security Bulletin 06 Oct 2021
The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 06 Oct 2021, published on 6 October 2021. Open the linked bulletin for the product, severity and reference information published in that issue.
Official advisory ↗CERT-FR · French · CERTFR-2022-AVI-265Multiples vulnérabilités dans le noyau Linux de Ubuntu
Official advisory ↗CERT-FR · French · CERTFR-2021-AVI-969Multiples vulnérabilités dans le noyau Linux de Debian
VERecord?id=CVE-2021-3753
Référence CVE CVE-2021-3760
https://www.cve.org/CVERecord?id=CVE-2021-3760
Référence CVE CVE-2021-3816
https://www.cve.org/CVERecord?id=CVE-2021-3816
Référence CVE CVE-2021-38198
https://www.cve.org/CVERecord?id=CVE-2021-38198
Référence CVE CVE-2021-38199
https://www.cve.org/CVERecord?id=CVE-2021-38199
Référence CVE CVE-2021-3820
https://www.cve.org/CVERecord?id=CVE-2021-3820
Référence CVE CVE-2021-38204
https://www.cve.org/CVERecord?id=CVE-2021-38204
Référence CVE CVE-2021-40490
https://www.cve.org/CVERecord?id=CVE-2021-40490
Référence CVE CVE-2021-41864
https://www.cve.org/CVERecord?id=CVE-2021-41864
Référence CVE CVE-2021-42008
https://www.cve.org/CVERecord?id=CVE-2021-42008
Référence CVE CVE-2021-4273
https://www.cve.org/CVERecord?id=CVE-2021-4273
Référence CVE CVE-2021-43389
https://www.cve.org/CVERecord?id=CVE-2021-43389
Gestion détaillée du document
le 20 décembre 2021
Version initiale
Alertes
Avis
Bulletins d’actualités
Mentions légales
Conditions générales
À propos
Contact
cyber.gouv.fr
service-public.fr
legifrance.gouv.fr
info.gouv.fr
france.fr
info.gouv.fr/risques
Premier Ministre / Secrétariat Général de la Défense et de la Sécurité Nationale / Agence nationale de la
sécurité des systèmes d'information
Official advisory ↗CERT-FR · French · CERTFR-2021-AVI-934Multiples vulnérabilités dans le noyau Linux de SUSE
VERecord?id=CVE-2021-3759
Référence CVE CVE-2021-3760
https://www.cve.org/CVERecord?id=CVE-2021-3760
Référence CVE CVE-2021-3764
https://www.cve.org/CVERecord?id=CVE-2021-3764
Référence CVE CVE-2021-3772
https://www.cve.org/CVERecord?id=CVE-2021-3772
Référence CVE CVE-2021-38160
https://www.cve.org/CVERecord?id=CVE-2021-38160
Référence CVE CVE-2021-38198
https://www.cve.org/CVERecord?id=CVE-2021-38198
Référence CVE CVE-2021-38204
https://www.cve.org/CVERecord?id=CVE-2021-38204
Référence CVE CVE-2021-40490
https://www.cve.org/CVERecord?id=CVE-2021-40490
Référence CVE CVE-2021-41864
https://www.cve.org/CVERecord?id=CVE-2021-41864
Référence CVE CVE-2021-42008
https://www.cve.org/CVERecord?id=CVE-2021-42008
Référence CVE CVE-2021-42252
https://www.cve.org/CVERecord?id=CVE-2021-42252
Référence CVE CVE-2021-42739
https://www.cve.org/CVERecord?id=CVE-2021-42739
Référence CVE CVE-2021-43389
https://www.cve.org/CVERecord?id=CVE-2021-43389
Gestion détaillée du document
le 10 décembre 2021
Version initiale
Alertes
Avis
Bulletins d’actualités
Mentions légales
Conditions générales
À propos
Contact
cyber.gouv.fr
service-public.fr
legifrance.gouv.fr
info.gouv.fr
france.fr
info.gouv.fr/risques
Premier Ministre / Secrétariat Général de la Défense et de la Sécurité Nationale / Agence nationale de la
sécurité de
Official advisory ↗CERT-FR · French · CERTFR-2021-AVI-923Multiples vulnérabilités dans le noyau Linux de SUSE
VERecord?id=CVE-2021-3760
Référence CVE CVE-2021-3764
https://www.cve.org/CVERecord?id=CVE-2021-3764
Référence CVE CVE-2021-3772
https://www.cve.org/CVERecord?id=CVE-2021-3772
Référence CVE CVE-2021-38160
https://www.cve.org/CVERecord?id=CVE-2021-38160
Référence CVE CVE-2021-38198
https://www.cve.org/CVERecord?id=CVE-2021-38198
Référence CVE CVE-2021-38204
https://www.cve.org/CVERecord?id=CVE-2021-38204
Référence CVE CVE-2021-3896
https://www.cve.org/CVERecord?id=CVE-2021-3896
Référence CVE CVE-2021-40490
https://www.cve.org/CVERecord?id=CVE-2021-40490
Référence CVE CVE-2021-41864
https://www.cve.org/CVERecord?id=CVE-2021-41864
Référence CVE CVE-2021-42008
https://www.cve.org/CVERecord?id=CVE-2021-42008
Référence CVE CVE-2021-42252
https://www.cve.org/CVERecord?id=CVE-2021-42252
Référence CVE CVE-2021-42739
https://www.cve.org/CVERecord?id=CVE-2021-42739
Référence CVE CVE-2021-43389
https://www.cve.org/CVERecord?id=CVE-2021-43389
Gestion détaillée du document
le 08 décembre 2021
Version initiale
Alertes
Avis
Bulletins d’actualités
Mentions légales
Conditions générales
À propos
Contact
cyber.gouv.fr
service-public.fr
legifrance.gouv.fr
info.gouv.fr
france.fr
info.gouv.fr/risques
Premier Ministre / Secrétariat Général de la Défense et de la Sécurité Nationale / Agence nationale de la
sécurité de
Official advisory ↗CERT-FR · French · CERTFR-2021-AVI-916Multiples vulnérabilités dans le noyau Linux de SUSE
VERecord?id=CVE-2021-3759
Référence CVE CVE-2021-3760
https://www.cve.org/CVERecord?id=CVE-2021-3760
Référence CVE CVE-2021-3764
https://www.cve.org/CVERecord?id=CVE-2021-3764
Référence CVE CVE-2021-3772
https://www.cve.org/CVERecord?id=CVE-2021-3772
Référence CVE CVE-2021-38160
https://www.cve.org/CVERecord?id=CVE-2021-38160
Référence CVE CVE-2021-38198
https://www.cve.org/CVERecord?id=CVE-2021-38198
Référence CVE CVE-2021-38204
https://www.cve.org/CVERecord?id=CVE-2021-38204
Référence CVE CVE-2021-40490
https://www.cve.org/CVERecord?id=CVE-2021-40490
Référence CVE CVE-2021-41864
https://www.cve.org/CVERecord?id=CVE-2021-41864
Référence CVE CVE-2021-42008
https://www.cve.org/CVERecord?id=CVE-2021-42008
Référence CVE CVE-2021-42252
https://www.cve.org/CVERecord?id=CVE-2021-42252
Référence CVE CVE-2021-42739
https://www.cve.org/CVERecord?id=CVE-2021-42739
Référence CVE CVE-2021-43389
https://www.cve.org/CVERecord?id=CVE-2021-43389
Gestion détaillée du document
le 03 décembre 2021
Version initiale
Alertes
Avis
Bulletins d’actualités
Mentions légales
Conditions générales
À propos
Contact
cyber.gouv.fr
service-public.fr
legifrance.gouv.fr
info.gouv.fr
france.fr
info.gouv.fr/risques
Premier Ministre / Secrétariat Général de la Défense et de la Sécurité Nationale / Agence nationale de la
sécurité de
Official advisory ↗CERT-FR · French · CERTFR-2021-AVI-893Multiples vulnérabilités dans le noyau Linux de SUSE
De multiples vulnérabilités ont été découvertes dans le noyau Linux de
SUSE. Certaines d'entre elles permettent à un attaquant de provoquer un
déni de service, une atteinte à l'intégrité des données et une atteinte
à la confidentialité des données.
Official advisory ↗CERT-FR · French · CERTFR-2021-AVI-886Multiples vulnérabilités dans le noyau Linux de SUSE
De multiples vulnérabilités ont été découvertes dans le noyau Linux de
SUSE. Certaines d'entre elles permettent à un attaquant de provoquer un
problème de sécurité non spécifié par l'éditeur, un déni de service et
une atteinte à l'intégrité des données.
Official advisory ↗CERT-FR · French · CERTFR-2021-AVI-880Multiples vulnérabilités dans le noyau Linux de SUSE
De multiples vulnérabilités ont été découvertes dans le noyau Linux de
SUSE. Elles permettent à un attaquant de provoquer une atteinte à
l'intégrité des données, un déni de service et une élévation de
privilèges.
Official advisory ↗CERT-FR · French · CERTFR-2021-AVI-869Multiples vulnérabilités dans SUSE le noyau Linux de SUSE
De multiples vulnérabilités ont été découvertes dans SUSE le noyau Linux
de SUSE. Certaines d'entre elles permettent à un attaquant de provoquer
un problème de sécurité non spécifié par l'éditeur, une exécution de
code arbitraire et un déni de service.
Official advisory ↗CERT-FR · French · CERTFR-2021-AVI-859Multiples vulnérabilités dans le noyau Linux de SUSE
De multiples vulnérabilités ont été découvertes dans le noyau Linux de
SUSE. Certaines d'entre elles permettent à un attaquant de provoquer un
problème de sécurité non spécifié par l'éditeur, un déni de service et
un contournement de la politique de sécurité.
Official advisory ↗CERT-FR · French · CERTFR-2021-AVI-814Multiples 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 un
contournement de la politique de sécurité.
Official advisory ↗CERT-FR · French · CERTFR-2021-AVI-798Multiples 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 et une atteinte à
la confidentialité des données.
Official advisory ↗JVN iPedia · Japanese · JVNDB-2021-021242Linux の Linux Kernel 等複数ベンダの製品における境界外書き込みに関する脆弱性
Linux の Linux Kernel 等複数ベンダの製品には、境界外書き込みに関する脆弱性が存在します。
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.
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 4 Oct 2021 · Last source change 4 Aug 2024, 03:22 UTC · CWE-787 · Out-of-bounds Write
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-2021-28998
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceNIST NVD
NVD statusNVD modified after enrichment
Missing structured fields: affected product. Missing data is not evidence of low risk; review the primary advisory.
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.