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.
References5
- git.kernel.org/stable/c/19d5566b84ca1af0256d0d0003e1a081580c3ba3
- git.kernel.org/stable/c/56f92fecd80419567288b7972caa90107033836e
- git.kernel.org/stable/c/644cf4e77c2770d4246f6d12f99bc80d253b0ec6
- git.kernel.org/stable/c/ac65c710cc643cbc52b899627577357867249530
- git.kernel.org/stable/c/c4dc883447ae38c4e22a29cc016046fa65d88994
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 8 · as of 8 November 2026
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