What’s Vulnerable › Vulnerabilities

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

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-10-19

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.

Affected products

• Linux kernel: 6.7 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

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

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