SB20260824243 - Race condition in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-74591)

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

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 an incorrect index restoration error in __filemap_add_folio() when retrying folio insertion after dropping the lock and reallocating memory. A local user can trigger a race condition to cause a denial of service.

The issue can result in a folio being stored at an incorrect xarray index after lock reacquisition if the conflict is resolved by another thread in the meantime.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/267ecd2eb7759c26f1a026eb0a5b231071534c9c
• https://git.kernel.org/stable/c/4917e3ebcab50f0265e8ca01c8567de4c4a47511
• https://git.kernel.org/stable/c/86da3f7e1e609e1e8bfbab198af68467c5a015a5