What’s Vulnerable › Vulnerabilities

CVE-2025-39924: erofs: fix invalid algorithm for encoded extents

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-01 · updated 2026-10-19

Description

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.

Affected products

• Linux kernel: from 6.15 before 6.16.8; 6.17-rc1, 6.17-rc2, 6.17-rc3, 6.17-rc4, 6.17-rc5 — fixed in 6.16.8

How to fix

Upgrade to a fixed version: Linux kernel 6.16.8. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/131897c65e2b86cf14bec7379f44aa8fbb407526
• https://git.kernel.org/stable/c/db5d7abd379a8dcf030be8f52f99cadf7e397ba8

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