SB20260918254 - Improper Check for Unusual or Exceptional Conditions in Linux kernel nilfs2

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-90418)

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

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 improper handling of an inconsistent dirty state in nilfs_copy_dirty_pages() when copying dirty DAT folios or pages to the shadow page cache. A local user can trigger the dirty-state mismatch to cause a denial of service.

The condition can occur after metadata corruption causes the filesystem to transition to read-only mode.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/3904fb0ee741ebbbc27ec8f50a9bb6cd31e8af05
• https://git.kernel.org/stable/c/4e1f21e7540b25d83f86b50780836ed7d2afcc93
• https://git.kernel.org/stable/c/5166a21b12f549774f2983fa86d2526ea9e66ace
• https://git.kernel.org/stable/c/66f4ad3ce158902e5f98afea93189972ed8750c2
• https://git.kernel.org/stable/c/f181155baf0c93a74ebe804c6cecbe970e78ee9e