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CVE-2026-89954: mtd: afs: validate v2 image info bounds

• Severity: high (CVSS 8.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-19

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.

Affected products

• Linux kernel: 5.2 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

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

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