nfsd: initialize DRC hash table before registering shrinker

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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.

Source published

24 Sep 2026 15:10:34 UTC

Source modified

19 Oct 2026 09:07:23 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

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