CVE-2026-89676

CVE CVE-2026-89676EUVD EUVD-2026-76588Published 2026-09-11T19:46:00.000ZLast changed 2026-09-13T06:32:58.000ZCVSS 9.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix stale s2s_cp_stateids IDR entry for async COPY For an async COPY, nfsd4_copy() called nfs4_init_copy_state() before dup_copy_fields(), so the s2s_cp_stateids IDR was pointed at &u->copy->cp_stateid -- memory in the per-rqstp COMPOUND buffer that is reused by the next request. dup_copy_fields() copies only the value into async_copy, so the IDR slot dangled at the transient buffer for the whole background copy. Any IDR walker then dereferences reused request memory: the laundromat reads cs_type from it and, if the bytes look like an expired NFS4_COPYNOTIFY_STID, follows into refcount_dec()/idr_remove()/kfree() on garbage; manage_cpntf_state() has the same exposure via idr_find(). Duplicate the fields first, then register the stateid on the stable async_copy. result->cb_stateid is unchanged.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <14b978e8d05ce018d0afbeb6611833ef91713a02; 4.20; patch: 7.3-rc1; patch: 7.2.4; patch: 6.18.50; patch: 0; e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <9b4e5e9ba5ae13808b8a6d229d87c54611ba0e7a; e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <d0beaee498e11880e72826026db0e9c9890fc114

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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