SB20261023186 - Improper control of a resource through its lifetime in Linux kernel xfs

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-98975)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to corrupt data in files that share filesystem blocks.

The vulnerability exists due to improper management of reflink flags in the XFS mapping-exchange and extent-swap paths when exchanging mappings between files that retain shared blocks. A local user can perform an affected exchange and subsequently write to a shared block whose inode has lost its reflink flag, causing an in-place write instead of copy-on-write to corrupt another file sharing that block.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1fa2f3a7ef7ee0f2503a4b0afe24bc8c9d0820be
• https://git.kernel.org/stable/c/4756c94260e69ce42612b8220c3614f02f7a11d5
• https://git.kernel.org/stable/c/7d3b9b2c9dc57f93f36c716ab752548cb4db9900
• https://git.kernel.org/stable/c/d84d6c1a7f1e2de9e601703a326a4c1b7b421943