CVEvulnerability
CVE-2026-90392
7.8 HIGH
Official page ↗
- Status
- Received
- Published
- 2026-09-17
- Last modified
- 2026-10-19
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- CVSS 3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)
- 7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
References
- https://git.kernel.org/stable/c/79347e42cfbc9e78872922e8f08a70609c9af82f git.kernel.org
- https://git.kernel.org/stable/c/85cf991c881e7198be32be05a9daa2625390c8b3 git.kernel.org
- https://git.kernel.org/stable/c/863f3ddd0b8ac65abfb50d3be0869268ac0e277b git.kernel.org
- https://git.kernel.org/stable/c/a5c936ac904767fc1d943d40b0308bcb2ae2509b git.kernel.org
- https://git.kernel.org/stable/c/d7d7208e2603b45724b684f4df73904fb347741e git.kernel.org