SB20261023205 - Memory leak in Linux kernel btrfs

Description

This security bulletin contains information about 1 vulnerability.

1) Memory leak (CVE-ID: CVE-2026-98960)

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

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

The vulnerability allows a local user to exhaust kernel memory, potentially causing a denial of service.

The vulnerability exists due to a memory leak in the Btrfs io_uring encoded read and write handlers when requests return -EAGAIN and are cancelled or the ring exits before reissue. A local user can repeatedly trigger these request lifecycles to leave btrfs_uring_encoded_data allocations unreleased, potentially exhausting kernel memory and causing a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/4d9c1e0a7fb2cfb1cc924acafc194d2c15c3e83e
• https://git.kernel.org/stable/c/51562a8cb11628d3a5e105b4c347ec5473e5745f