SB20261023206 - Missing Release of Resource after Effective Lifetime in Linux kernel btrfs

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-98961)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

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

The vulnerability allows a local user to cause a denial of service by leaving filesystem locks held, potentially blocking subsequent operations.

The vulnerability exists due to missing release of inode and extent locks in the Btrfs io_uring encoded-read failure handling when allocation of the pages array fails. A local user can trigger an encoded-read operation that encounters this allocation failure to leave the locks held and potentially block subsequent filesystem operations.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2797eb38773a96914ccedeec71eb2144645400b2
• https://git.kernel.org/stable/c/ada1fc725a4db407294ae90a0d40ef1c46f457f2
• https://git.kernel.org/stable/c/b6e8add5d79d1f6f819a054c833bab452bd7365d