nfsd: initialize copy-notify stateid before publishing it

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89669
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:53 UTC
Updated2026-09-11 20:19:53 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nfsd: initialize copy-notify stateid before publishing it nfsd4_copy_notify() finished initializing the cpntf state after nfs4_alloc_init_cpntf_state() had already linked it into the s2s_cp_stateids IDR and the parent's sc_cp_list, with cs_count == 1 (the membership reference) and none held for the caller. A racing OFFLOAD_CANCEL (crafted cl_id == nn->s2s_cp_cl_id plus the guessable so_id) could reach manage_cpntf_state() and free the entry, turning the caller's subsequent cpn_cnr_stateid read and cp_p_stateid/cp_p_clid writes into use-after-free. The owning clientid was also only recorded after publication, so it could not gate an ownership check in that window. Record cp_p_stateid and cp_p_clid inside nfs4_alloc_init_cpntf_state() before nfs4_init_cp_state() publishes the entry, and return it with an extra reference. The caller reads the stateid under that reference and drops it with nfs4_put_cpntf_state(); on a late error the laundromat reaps the entry.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 624322f1adc58acd0b69f77a6ddc764207e97241 e08a3dcaca0505f861e344a387f37f94d95dbdc2 git Not specified
CNA Linux Linux affected 624322f1adc58acd0b69f77a6ddc764207e97241 a4d7fedcaaf33e60a01e53eafca9041ef966212f git Not specified
CNA Linux Linux affected 624322f1adc58acd0b69f77a6ddc764207e97241 4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b git Not specified
CNA Linux Linux affected 624322f1adc58acd0b69f77a6ddc764207e97241 129643893b79f8a3c6b72045f933fbab5ee424ca git Not specified
CNA Linux Linux affected 5.6 Not specified
CNA Linux Linux unaffected 5.6 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a4d7fedcaaf33e60a01e53eafca9041ef966212f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e08a3dcaca0505f861e344a387f37f94d95dbdc2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/129643893b79f8a3c6b72045f933fbab5ee424ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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