SB20260720113 - Use-after-free in Linux kernel unix
Published: July 20, 2026
Security Bulletin ID
SB20260720113
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-2026-64109)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.8 [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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in unix_stream_data_wait() in net/unix/af_unix.c when processing racing recv() operations on the same AF_UNIX stream socket. A local user can trigger concurrent peek and normal receive operations to cause a denial of service.
Exploitation requires a race condition between a peeking recv() call and a normal recv() call on the same socket.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/26342087fac93b3932e6af61dc91ec029cb8a623
- https://git.kernel.org/stable/c/38bccb927d83d7d52e5b20015a172a0b6101d11e
- https://git.kernel.org/stable/c/5f162f95a95834f06a8ec6140889272ad12e842f
- https://git.kernel.org/stable/c/acdff9907478e82208475b1151700d0b71dcdc63
- https://git.kernel.org/stable/c/be309f8eae8b474a4a617eaae01324da996fc719