CVE-2026-89954
HIGH
Published Sep 16, 2026
Modified Sep 16, 2026
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.
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CVSS v3.1 Score
8.0
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
References
Other References
https://git.kernel.org/stable/c/18916f475057cbd2fb8ea6ae86e6b85884ad1d53
https://git.kernel.org/stable/c/1bec05a68414cf8d0cab6cb42445b8603f32ffc4
https://git.kernel.org/stable/c/1edea8900ca3e405c1421d8b5c29f97107874f72
https://git.kernel.org/stable/c/3ad8ff12fd44b08af9212ac4883a7e29d2ab7348
https://git.kernel.org/stable/c/875daa3c750814ff2e2dc050239c390048f0bcd0
https://git.kernel.org/stable/c/d14e6298139f58a87a87d7022e26a7f37f0ddce7
https://git.kernel.org/stable/c/da740539e8f370767317e24615349b9342a6e773
https://git.kernel.org/stable/c/e9290031f736e99ad17c25c00311c92c266843b7
Frequently Asked Questions
What is CVE-2026-89954? +
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. It has a CVSS v3.1 base score of 8.0 (HIGH).
How severe is CVE-2026-89954? +
CVE-2026-89954 has a CVSS v3.1 score of 8.0 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
How do I check if I'm vulnerable to CVE-2026-89954? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.