SB20260918409 - Improper control of a resource through its lifetime in Linux kernel btrfs

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-90260)

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

CVSSv4: 5.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to corrupt filesystem metadata and cause a denial of service.

The vulnerability exists due to improper control of an extent buffer's lifetime in the Btrfs zoned filesystem write path when writing a freed-but-still-dirty tree block. A local user can trigger writeout of a freed-but-still-dirty tree block to corrupt filesystem metadata and cause a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/92484ad014f2e2b0e0e7bbc1610951e978cf557c
• https://git.kernel.org/stable/c/98e3747587f9f87f010d8d7e55786216249a94af
• https://git.kernel.org/stable/c/db4b9eefc8ee0bcaeee4d5e6a7313905f6a2fe7c