Use-after-free in Linux kernel - CVE-2026-31533
Published: April 24, 2026
Vulnerability identifier: #VU127614
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-31533
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a use-after-free.
The vulnerability exists due to use-after-free in tls_do_encryption() when handling an -EBUSY error path during asynchronous encryption processing. A local user can trigger asynchronous encryption and a subsequent sendmsg to cause a use-after-free.
The issue occurs because a pending cryptd callback may access a freed tls_rec after cleanup state is corrupted by double handling of encrypt_pending and scatterlist restoration.
How to mitigate CVE-2026-31533
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/02f3ecadb23558bbe068e6504118f1b712d4ece0
- https://git.kernel.org/stable/c/0e43e0a3c94044acc74b8e0927c27972eb5a59e8
- https://git.kernel.org/stable/c/2694d408b0e595024e0fc1d64ff9db0358580f74
- https://git.kernel.org/stable/c/414fc5e5a5aff776c150f1b86770e0a25a35df3a
- https://git.kernel.org/stable/c/5d70eb25b41e9b010828cd12818b06a0c3b04412
- https://git.kernel.org/stable/c/a9b8b18364fffce4c451e6f6fd218fa4ab646705
- https://git.kernel.org/stable/c/aa9facde6c5005205874c37db3fd25799d741baf