CVE-2026-89954
mtd: afs: validate v2 image info bounds
Description
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.
INFO
Published Date :
Sept. 16, 2026, 11:17 a.m.
Last Modified :
Sept. 16, 2026, 3:18 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to the resolved version.
- Apply the patch for mtd: afs: validate v2 image info bounds.
- Ensure footer offset and region count are validated.
- Reject invalid image information entries.
References to Advisories, Solutions, and Tools
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CVE-2026-89954.
CWE - Common Weakness Enumeration
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associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
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approaches employed by adversaries to exploit the CVE-2026-89954
weaknesses.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 16, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 16, 2026
Action Type Old Value New Value Added Description 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. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/89xxx/CVE-2026-89954.json">CVE-2026-89954</a> Added Reference https://git.kernel.org/stable/c/18916f475057cbd2fb8ea6ae86e6b85884ad1d53 Added Reference https://git.kernel.org/stable/c/1bec05a68414cf8d0cab6cb42445b8603f32ffc4 Added Reference https://git.kernel.org/stable/c/1edea8900ca3e405c1421d8b5c29f97107874f72 Added Reference https://git.kernel.org/stable/c/3ad8ff12fd44b08af9212ac4883a7e29d2ab7348 Added Reference https://git.kernel.org/stable/c/875daa3c750814ff2e2dc050239c390048f0bcd0 Added Reference https://git.kernel.org/stable/c/d14e6298139f58a87a87d7022e26a7f37f0ddce7 Added Reference https://git.kernel.org/stable/c/da740539e8f370767317e24615349b9342a6e773 Added Reference https://git.kernel.org/stable/c/e9290031f736e99ad17c25c00311c92c266843b7