Use-after-free in Linux kernel - CVE-2026-90392
Published: September 18, 2026
Vulnerability identifier: #VU151088
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-2026-90392
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 use-after-free in bpf_link_show_fdinfo and bpf_link_get_info_by_fd when reading BPF link information while a linked program is concurrently replaced via bpf_link_update. A local user can concurrently replace a linked program and read BPF link information to trigger a use-after-free condition.
Affected software
Linux kernel
How to mitigate CVE-2026-90392
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/79347e42cfbc9e78872922e8f08a70609c9af82f
- https://git.kernel.org/stable/c/85cf991c881e7198be32be05a9daa2625390c8b3
- https://git.kernel.org/stable/c/863f3ddd0b8ac65abfb50d3be0869268ac0e277b
- https://git.kernel.org/stable/c/a5c936ac904767fc1d943d40b0308bcb2ae2509b
- https://git.kernel.org/stable/c/d7d7208e2603b45724b684f4df73904fb347741e