Use-after-free in Linux kernel - CVE-2026-89789
Published: September 17, 2026
Vulnerability identifier: #VU150500
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89789
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose and modify sensitive information and cause a denial of service.
The vulnerability exists due to use-after-free in the gtp_newlink() error path in drivers/net/gtp.c when handling gtp_newlink() error paths concurrently with gtp encapsulation receive operations. A local user can trigger the race condition to disclose and modify sensitive information and cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-89789
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/3ca3da5c305caa873ddb81e8c6b118143f6dd3d1
- https://git.kernel.org/stable/c/6f815c2fb6ab20385f81c353cdad0ea3b88132af
- https://git.kernel.org/stable/c/7677eb2cbf2cc7446de474c01a6b06277c0051e5
- https://git.kernel.org/stable/c/8d85498016a5bb56339734a14c276209fa65bafc
- https://git.kernel.org/stable/c/d989e22ae9802c52c56ad4284d0caf26696cf6ae
- https://git.kernel.org/stable/c/e3b9aa0773abd5d4ed90be41ce5306c146d5b09e
- https://git.kernel.org/stable/c/fcafb2b1430824bae4258c01a439ec97ca0c6973
- https://git.kernel.org/stable/c/fd8396cfecbd904468c71362f08aaa25f96d5337