EUVD-2026-28614
GHSA-7669-mcjm-pwg9
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionNVD
In the Linux kernel, the following vulnerability has been resolved:
crypto: caam - fix overflow on long hmac keys
When a key longer than block size is supplied, it is copied and then hashed into the real key. The memory allocated for the copy needs to be rounded to DMA cache alignment, as otherwise the hashed key may corrupt neighbouring memory.
The copying is performed using kmemdup, however this leads to an overflow: reading more bytes (aligned_len - keylen) from the keylen source buffer. Fix this by replacing kmemdup with kmalloc, followed by memcpy.
AnalysisAI
Buffer overflow in the Linux kernel's CAAM crypto driver allows local authenticated attackers to corrupt memory and potentially execute arbitrary code with elevated privileges. The vulnerability occurs when HMAC keys exceeding the algorithm's block size are processed - the driver allocates DMA-aligned memory but uses kmemdup() to copy only the actual key length, then reads beyond the source buffer boundary during hashing. …
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RemediationAI
Within 24 hours: Inventory all Linux systems running kernel versions prior to 6.3 and identify those using CAAM crypto driver (check: grep -i caam /boot/config-$(uname -r)). Within 7 days: Deploy kernel patches to affected systems-minimum versions are 6.6.134, 6.12.81, 6.18.22, 6.19.12, or 7.0 depending on currently deployed branch; prioritize production systems first. …
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