Bug 2440660 (CVE-2025-71231)

Summary: CVE-2025-71231 kernel: Linux kernel: Denial of Service due to out-of-bounds index in IAA crypto module
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel. A local, privileged user could exploit this by triggering a scenario where the `find_empty_iaa_compression_mode` function returns an out-of-bounds index. This can lead to an invalid array access, resulting in a kernel crash and a denial of service. In some cases, it may also risk memory corruption.
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Description OSIDB Bzimport 2026-02-18 16:02:55 UTC 
In the Linux kernel, the following vulnerability has been resolved:

crypto: iaa - Fix out-of-bounds index in find_empty_iaa_compression_mode

The local variable 'i' is initialized with -EINVAL, but the for loop
immediately overwrites it and -EINVAL is never returned.

If no empty compression mode can be found, the function would return the
out-of-bounds index IAA_COMP_MODES_MAX, which would cause an invalid
array access in add_iaa_compression_mode().

Fix both issues by returning either a valid index or -EINVAL.
Comment 1 Alexander B 2026-02-18 18:51:12 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026021805-CVE-2025-71231-5cc3@gregkh/T