SB2026050212 - Use-after-free in Linux kernel atm
Published: May 2, 2026
Security Bulletin ID
SB2026050212
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-43050)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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
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.
Remediation
Install update from vendor's website.
References
- 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