Use-after-free in Linux kernel - CVE-2026-98091
Published: September 28, 2026
Vulnerability identifier: #VU152371
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98091
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a kernel warning.
The vulnerability exists due to use-after-free in the btrfs device transaction update list when system chunk creation fails while creating the first metadata chunk for a sprout filesystem. A local user can create a sprout filesystem that encounters a system chunk creation failure to cause a kernel warning.
Affected software
Linux kernel
How to mitigate CVE-2026-98091
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3