SB20260827105 - Out-of-bounds write in Linux kernel xfs

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-80536)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to an out-of-bounds write in xlog_recover_do_reg_buffer() when processing a crafted XFS filesystem image during mount-time log recovery. A remote attacker can mount a specially crafted filesystem image to execute arbitrary code.

The issue is reachable during mount-time recovery on production kernels where the bounds check was enforced only by an ASSERT().

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/813f8136a2ce1fee266d02a7df73db6e8a541604
• https://git.kernel.org/stable/c/edaf5b6bd625356893da20d69a259b34a9de2694
• https://git.kernel.org/stable/c/f8288214459ead7e87d26e5822f62c14a4f2ed6b