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Critical 2 vendors · 2 advisories

CVE-2026-89669: nfsd: initialize copy-notify stateid before publishing it

CVE-2026-89669 key facts

CISA KEV
Not listed (catalogue checked )
Highest advisory rating
Critical
CVSS base score
9.8 (NetApp), 7 (Red Hat)
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, .
Fixed releases
  • 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
Vendor advisories
2 from NetApp, Red Hat
Assigned by
Linux (CNA)
CVE record published
Listed by VulniPulse
Record changed

Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-89669; each belongs to its advisory, not to every product listed. How records are collected and checked.

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.

Text from the CVE.org record (Linux).

How do I fix CVE-2026-89669?

Upgrade to a fixed release named by the vendor:

  • 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

Vendor advisories for CVE-2026-89669

NetApp

1 advisory
  • Advisory severityCritical9.8

    Critical [CVE-2026-89669] Linux Kernel Vulnerability in NetApp Products

    NTAP-20261002-0014Source published Source updated

    Linux kernel versions 5.6-rc1 through 6.12.108, 6.13-rc1 through 6.18.49 and 6.19-rc1 through 7.2.3 are susceptible to a vulnerability which when successfully exploited could lead to disclosure of sensitive information, addition or modification of data or Denial of Service (DoS). NetApp reports that one or more additional products remain under investigation; review the canonical advisory for current status. NetApp states there is no workaround available at this time.

    Affected products in this advisory
    No product details extracted. Check the source bulletin.
    Source-reported affected versions
    • 6.12.108
    • 6.13
    • 6.18.49
    • 6.19

    1 more entries in the full advisory.

    Source-reported fixed versions
    No fixed-version detail extracted. This does not mean no fix exists.
    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityHigh7.0

    High [CVE-2026-89669] initialize copy-notify stateid before publishing it

    CVE-2026-89669Source published Source updated

    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…

    Affected products in this advisory
    • Red Hat Enterprise Linux 10
    • Red Hat Enterprise Linux 9
    • Shadow Migration Toolkit for Virtualization for RHEL 10
    • Red Hat OpenShift Container Platform 4

    1 more entries in the full advisory.

    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    • 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
    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin

References

Timeline

  1. CVE record published
  2. First vendor advisory listed by VulniPulse
  3. CVE record last updated

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