SB2026072046 - Race condition in Linux kernel netfslib size handling

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-64160)

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 netfslib size handling when concurrently updating or reading remote_i_size and zero_point. A local user can trigger concurrent filesystem operations to cause a denial of service.

The issue can corrupt i_size_seqcount and make subsequent i_size_read() calls loop forever, and the advisory highlights 32-bit systems as affected by tearing concerns.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2c8f4742bb76117d735f92a3932d85239b16c494
• https://git.kernel.org/stable/c/55970f238d495517edc961d55c44c772594d0969