CVE-2026-90392high

CVE-2026-90392: high-severity vulnerability in Linux

bpf: Fix potential UAF when reading bpf link info

Published · Updated

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.8epss 0.2%
exploitation probability
0.2%top 94% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · Linux
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References
https://git.kernel.org/stable/c/79347e42cfbc9e78872922e8f08a70609c9af82fhttps://git.kernel.org/stable/c/85cf991c881e7198be32be05a9daa2625390c8b3https://git.kernel.org/stable/c/863f3ddd0b8ac65abfb50d3be0869268ac0e277bhttps://git.kernel.org/stable/c/a5c936ac904767fc1d943d40b0308bcb2ae2509bhttps://git.kernel.org/stable/c/d7d7208e2603b45724b684f4df73904fb347741e