Use-after-free in Linux kernel - CVE-2026-90278
Published: September 18, 2026
Vulnerability identifier: #VU151204
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-2026-90278
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger use-after-free access to llbitmap storage.
The vulnerability exists due to incorrect teardown ordering in the md bitmap teardown path when stopping an md device configured with llbitmap while RAID1 behind-write completions are pending. A local user can stop an affected md device while RAID1 behind-write completions are pending to trigger use-after-free access to llbitmap storage.
Affected software
Linux kernel
How to mitigate CVE-2026-90278
Install security update from vendor's repository.