CVE-2026-93144
Published: September 19, 2026Last modified: November 3, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject writes through untrusted BTF pointers check_ptr_to_btf_access() lets program-type btf_struct_access callbacks validate writes before the default BTF access path rejects non-read accesses. That bypasses the read-only policy for untrusted BTF pointers created by helpers such as bpf_rdonly_cast(). Reject non-read accesses through PTR_UNTRUSTED BTF pointers at the common entry point, before the callback branch to handle all cases.
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 | Not affected (6.1.33-r0) |
| 25 LTS | linux-lts | Fixed (6.12.115-r0) | |
| Stream | linux-lts | Fixed (6.18.58-r0) |
References
- https://git.kernel.org/stable/c/19d5566b84ca1af0256d0d0003e1a081580c3ba3
- https://git.kernel.org/stable/c/56f92fecd80419567288b7972caa90107033836e
- https://git.kernel.org/stable/c/644cf4e77c2770d4246f6d12f99bc80d253b0ec6
- https://git.kernel.org/stable/c/ac65c710cc643cbc52b899627577357867249530
- https://git.kernel.org/stable/c/c4dc883447ae38c4e22a29cc016046fa65d88994