SB20260928316 - Use of Uninitialized Variable in Linux kernel netfs

Description

This security bulletin contains information about 1 vulnerability.

1) Use of Uninitialized Variable (CVE-ID: CVE-2026-97610)

CWE-ID: CWE-457 - Use of Uninitialized Variable

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause incorrect error reporting.

The vulnerability exists due to use of an uninitialized return value in netfs_unbuffered_write() when preparing the first subrequest for a synchronous write fails. A local user can trigger a synchronous CIFS write for which request preparation fails to cause incorrect error reporting.

The issue is reachable when cifs_prepare_write() fails to reopen the file or obtain credits.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2e38d500471d097cda87d7d374bbc1b13493075d
• https://git.kernel.org/stable/c/3d038eebdbd400c3bc4b66bd8aa0dff0c2bcce26
• https://git.kernel.org/stable/c/f18e8774f4d3137fa0a5fb8ffa83d59a719666d8