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CVE-2026-93144: bpf: Reject writes through untrusted BTF pointers

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-21

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.

Affected products

• Linux kernel: 6.2 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

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

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