CVE-2026-90392
Published: September 19, 2026Last modified: September 28, 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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Vulnerable (6.1.182-r0) |
| 25 LTS | linux-lts | Fixed (6.12.111-r0) | |
| Stream | linux-lts | Fixed (6.18.53-r0) |
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