SB20260720196 - Race condition in Linux kernel erofs

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-64031)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in the erofs managed cache handling in z_erofs_fill_bio_vec() and z_erofs_bind_cache() when processing unaligned compressed extents from a crafted image. A local user can provide a crafted image to trigger duplicate managed folio additions and cause a denial of service.

This only impacts unaligned data compression, such as with the -E48bit feature and zstd compression.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/038166f873c4caf6e85cfd4ea0c5a5ba297b4e8b
• https://git.kernel.org/stable/c/425d32d6288d7d845e486af9419bbedccd8c9103
• https://git.kernel.org/stable/c/649932fc3815eda2f24eb4de4b3a5e94886ee0b9