Use-after-free in Linux kernel - CVE-2026-90393
Published: September 18, 2026
Vulnerability identifier: #VU151089
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90393
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger a use-after-free condition.
The vulnerability exists due to a race condition in bpf_netns_link_update_prog when concurrently executing BPF_LINK_UPDATE operations on the same network namespace link. A local user can race program updates to trigger a use-after-free condition.
Affected software
Linux kernel
How to mitigate CVE-2026-90393
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/277168cb9d153ce8e9c3f9275670e32ae61b41d6
- https://git.kernel.org/stable/c/5c5997836381010fc5907b36bc17d3b19407e933
- https://git.kernel.org/stable/c/79a66fd997d4eecf17302d613194879eb32e0986
- https://git.kernel.org/stable/c/923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7
- https://git.kernel.org/stable/c/bda86e9f31b9a296b6e64a51c91dc776fc9f613e
- https://git.kernel.org/stable/c/bdddf3e1493ee973619c154a57071ce67f78598b
- https://git.kernel.org/stable/c/d462b5481d77ce7df8a5ff89a699386f00c9214d
- https://git.kernel.org/stable/c/f4ce6803df4095777191d800bebc50219b615ca0