CVE-2026-89669: Red Hat initialize copy-notify stateid before publishing it
This Red Hat advisory covers CVE-2026-89669 in Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 and Shadow Migration Toolkit for Virtualization for RHEL 10.
Key facts
- Vendor rating
- High, CVSS 7
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H· base score 9.8, scored by LinuxAttack vector: network. Attack complexity: low. Privileges required: none. User interaction: none. Scope: unchanged. Confidentiality impact: high. Integrity impact: high. Availability impact: high.- EPSS
- 0.69% chance of exploitation in the next 30 days (53rd percentile). FIRST EPSS, .
- CISA KEV
- Not listed (catalogue checked )
- Fixed in
- kernel-0:6.12.0-211.64.1.el10_2, kernel-0:5.14.0-687.56.1.el9_8, RHSA-2026:77690 and 1 more below
- Source published
- Source revised
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
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. A use-after-free vulnerability exists due to improper initialization of the copy-notify state ID before its publication.
A remote attacker could exploit this by sending a crafted `OFFLOAD_CANCEL` operation, leading to a race condition that frees the state ID prematurely.
Text from the source record.
How to fix CVE-2026-89669
Upgrade to a fixed release named by Red Hat:
- kernel-0:6.12.0-211.64.1.el10_2
- kernel-0:5.14.0-687.56.1.el9_8
- RHSA-2026:77690
- RHSA-2026:77689
CVE-2026-89669 in other vendors' advisories
- NetApp: NTAP-20261002-0014, critical severity
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