Bug 2400635 (CVE-2025-39924)

Summary: CVE-2025-39924 kernel: erofs: fix invalid algorithm for encoded extents
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-10-01 09:02:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

erofs: fix invalid algorithm for encoded extents

The current algorithm sanity checks do not properly apply to new
encoded extents.

Unify the algorithm check with Z_EROFS_COMPRESSION(_RUNTIME)_MAX
and ensure consistency with sbi->available_compr_algs.
Comment 1 Alexander B 2025-10-02 11:54:52 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100124-CVE-2025-39924-1a11@gregkh/T