CVE-2026-90392
Published Sep 17, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix potential UAF when reading bpf link info In bpf_link_show_fdinfo and bpf_link_get_info_by_fd, link->prog is accessed without holding any locks. If the prog is concurrently replaced via bpf_link_update, the old prog can be freed, leading to a potential UAF issue. Fix this by accessing link->prog under RCU protection to safely fetch the pointer and guarantee its lifetime while reading its fields.
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References
Other 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
Frequently Asked Questions
What is CVE-2026-90392? +
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix potential UAF when reading bpf link info
In bpf_link_show_fdinfo and bpf_link_get_info_by_fd, link->prog is
accessed without holding any locks. If the prog is concurrently replaced
via bpf_link_update, the old prog can be freed, leading to a potential
UAF issue.
Fix this by accessing link->prog under RCU protection to safely fetch
the pointer and guarantee its lifetime while reading its fields.
How do I check if I'm vulnerable to CVE-2026-90392? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.