SB20260928298 - Improper Check or Handling of Exceptional Conditions in Linux kernel fs

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-97902)

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

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

The vulnerability exists due to improper error handling in thaw_super_locked() when handling nested filesystem thaw operations. A local privileged user can cause bdev_thaw() to retain an elevated filesystem-freeze count after releasing a freeze hold to cause a denial of service.

The condition occurs when a FIFREEZE freeze is nested with bdev_freeze().

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/111339816138f042a59778322f941edc26903484
• https://git.kernel.org/stable/c/76e478499913dc1f368aebe85b28b7d1265985ff
• https://git.kernel.org/stable/c/fe967191e5851ea79818c5fe4e781c3882139218
• https://git.kernel.org/stable/c/ff2a694f6613d54ebd77ba72583d4d94446f55bd