SB2026092873 - Operation on a Resource after Expiration or Release in Linux kernel smb client

Description

This security bulletin contains information about 1 vulnerability.

1) Operation on a Resource after Expiration or Release (CVE-ID: CVE-2026-98124)

CWE-ID: CWE-672 - Operation on a Resource after Expiration or Release

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to disclose stale file contents.

The vulnerability exists due to improper cache invalidation in FS-Cache handling for SMB client server-side range operations when performing server-side range operations on a file. A local user can perform a server-side range operation and read the affected file to disclose stale file contents.

FS-Cache must be enabled on a CIFS mount with an active CacheFiles backend.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/448ba0ae65ca61064183564d2983c9aa59bd6ba7
• https://git.kernel.org/stable/c/93c6e5a8d7c5071d586c1411596d5db5faad22b2