SB2026050854 - Improper Check or Handling of Exceptional Conditions in Linux kernel nfs

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-43470)

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

CVSSv4: 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/E:U/U:Clear

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

The vulnerability exists due to improper handling of directory aliases in nfs3_proc_create when processing concurrent file creation and removal operations with the same name. A local user can trigger concurrent create and open operations without O_EXCL to cause a denial of service.

The issue can result in a kernel oops when a negative dentry is supplied to do_dentry_open during finish_open.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/203c792cb4315360d49973ae2e57feeb6d3dcf7e
• https://git.kernel.org/stable/c/410666a298c34ebd57256fde6b24c96bd23059a2
• https://git.kernel.org/stable/c/7e2963773760a664684435201960dd2fb712f1b5
• https://git.kernel.org/stable/c/9ee1770fcb2f1b48354622b926e7dc10222805f5