SB20260816176 - Improper Check or Handling of Exceptional Conditions in Linux kernel netfs writeback rolling buffer operations

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-74542)

CWE-ID: CWE-703 - Improper Check or Handling of 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 memory allocation failure in netfs writeback rolling buffer operations when processing writeback requests under memory pressure. A local user can trigger folio_queue allocation failure to cause a denial of service.

The issue can lead to a kernel warning in netfs_writepages.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1d78d56c43ef3768183e8370e7367b162700e049
• https://git.kernel.org/stable/c/3f6d7f8a5416d852648d15a05e895f1195ee8a85