Use-after-free in Linux kernel - CVE-2026-43050
Published: May 2, 2026
Vulnerability identifier: #VU128861
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-43050
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 denial of service.
The vulnerability exists due to a use-after-free in sock_def_readable() when accessing priv->lecd during concurrent socket teardown. A local user can trigger a race condition to cause a denial of service.
The issue occurs because concurrent code paths dereference priv->lecd without protection while lec_atm_close() clears the pointer and the socket may be freed via RCU.
How to mitigate CVE-2026-43050
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/317843d5355062020649124eb4a0d7acbcc3f53e
- https://git.kernel.org/stable/c/3989740fa4978e1d2d51ecc62be1b01093e104ad
- https://git.kernel.org/stable/c/3e8b25f32f2f35549d03d77da030a24a45bdef5b
- https://git.kernel.org/stable/c/5fbbb1ff936d7ff9528d929c1549977e8123d8a8
- https://git.kernel.org/stable/c/750a33f417f3d196b86375f8d9f8938bacf130fe
- https://git.kernel.org/stable/c/922814879542c2e397b0e9641fd36b8202a8e555
- https://git.kernel.org/stable/c/abc10f85a3965ac14b9ed7ad3e67b35604a63aa3
- https://git.kernel.org/stable/c/b256d055da47258e63f8b40965f276c5f23d229a