SB20260928382 - Always-Incorrect Control Flow Implementation in Linux kernel xfs libxfs

Description

This security bulletin contains information about 1 vulnerability.

1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-97547)

CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause data corruption between reflink-related files.

The vulnerability exists due to improper reflink flag handling in xmi_can_exchange_reflink_flags in XFS exchange-range operations when exchanging full-file ranges with XFS_EXCHMAPS_INO1_WRITTEN requested. A local user can exchange full-file ranges between files with shared extents to cause data corruption between reflink-related files.

Hole and unwritten mappings from the first file can be skipped during the exchange.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/56f87ac2b9543be2be529b831666682e6df4bc40
• https://git.kernel.org/stable/c/8ae30b9a8c207f9bd03a98eda7b5d641daa79bdb
• https://git.kernel.org/stable/c/a23eca88448e52eb1a81549862df7adce794fafb
• https://git.kernel.org/stable/c/fac32b9950a2aab3f8659d23b2947b8fb305c3fe