mtd: afs: validate v2 image info bounds
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · Low · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
In the Linux kernel, the following vulnerability has been resolved: mtd: afs: validate v2 image info bounds The AFS v2 parser uses footer[8] to locate the image information block inside the current erase block, then uses the image information region_count to walk entries from a fixed local array. The footer offset and region count come from flash contents and are not checked against the erase block or the local image-info array before use. Reject v2 entries whose image information offset would underflow the erase block calculation, and reject region counts that cannot fit in the local image-info array before walking region entries.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 7 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift Container Platform 5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-89954
- 2026-10-03 Alias added: GHSA-jx3v-9v24-f367
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-11-06 Affected versions changed · Red Hat
- 2026-11-06 CVSS score added · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/1bec05a68414cf8d0cab6cb42445b8603f32ffc4
- https://git.kernel.org/stable/c/3ad8ff12fd44b08af9212ac4883a7e29d2ab7348
- https://git.kernel.org/stable/c/875daa3c750814ff2e2dc050239c390048f0bcd0
- https://git.kernel.org/stable/c/da740539e8f370767317e24615349b9342a6e773
- https://git.kernel.org/stable/c/1edea8900ca3e405c1421d8b5c29f97107874f72
- https://git.kernel.org/stable/c/18916f475057cbd2fb8ea6ae86e6b85884ad1d53
- https://git.kernel.org/stable/c/d14e6298139f58a87a87d7022e26a7f37f0ddce7
- https://git.kernel.org/stable/c/e9290031f736e99ad17c25c00311c92c266843b7
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Sources
- CVE-2026-89954 · CVE Program
- CVE-2026-89954 · NVD
- FIRST EPSS
- GHSA-jx3v-9v24-f367 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-89954 · Red Hat security data · CC BY 4.0
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