High severity7.8NVD Advisory· Published Sep 17, 2026· Updated Oct 30, 2026
CVE-2026-90392
CVE-2026-90392
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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Affected products
3- osv-coords2 versions
< 7.2.8-1.1+ 1 more
- (no CPE)range: < 7.2.8-1.1
- (no CPE)range: >= 5.7.0, < 6.1.191
Patches
Vulnerability mechanics
References
6- git.kernel.org/stable/c/4c8432a332d4a24dc2742f56062a53d8fad36f53nvd
- git.kernel.org/stable/c/79347e42cfbc9e78872922e8f08a70609c9af82fnvd
- git.kernel.org/stable/c/85cf991c881e7198be32be05a9daa2625390c8b3nvd
- git.kernel.org/stable/c/863f3ddd0b8ac65abfb50d3be0869268ac0e277bnvd
- git.kernel.org/stable/c/a5c936ac904767fc1d943d40b0308bcb2ae2509bnvd
- git.kernel.org/stable/c/d7d7208e2603b45724b684f4df73904fb347741envd
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