Use-after-free in Linux kernel - CVE-2026-99280
Published: November 8, 2026
Vulnerability identifier: #VU161899
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-99280
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to potentially cause a denial of service by triggering access to freed kernel memory.
The vulnerability exists due to a use-after-free in ksmbd session file-table handling when a procfs file-counter read overlaps with file-table destruction during previous-session replacement. A local user can read session file counters during this operation to access the file table's idr during or after its destruction, potentially causing a kernel crash.
Affected software
Linux kernel
How to mitigate CVE-2026-99280
Install security update from vendor's repository.