CVE-2026-89669

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89669

Key Details

CVE	CVE-2026-89669
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-19
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In 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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89669
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89669

Source

Reference

NVD

CVE