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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 39/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.69% (FIRST EPSS); higher than 52.4% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 129643893b79f8a3c6b72045f933fbab5ee424ca, 4415a692346a39fdb647cbd717eda510159aaf55, 4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 129643893b79f8a3c6b72045f933fbab5ee424ca, 4415a692346a39fdb647cbd717eda510159aaf55, 4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Sep 11, 2026
Updated
Oct 19, 2026
EPSS
0.6% · 52th percentile
CWE
—

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CNA vs NVD score

NVD
—
CNA · Linux
9.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.6affected
    • 624322f1adc58acd0b69f77a6ddc764207e97241 and later · before 863b6e995665472f2af5be2436a874ab6a9e5ac6affected · git
    • 624322f1adc58acd0b69f77a6ddc764207e97241 and later · before d18d36395d973ef7372c8e6724970585f75b5c0baffected · git
    • 624322f1adc58acd0b69f77a6ddc764207e97241 and later · before 4415a692346a39fdb647cbd717eda510159aaf55affected · git
    • 624322f1adc58acd0b69f77a6ddc764207e97241 and later · before 9caad13b7cfe9ccb90cc405ac77335800e086595affected · git
    • 624322f1adc58acd0b69f77a6ddc764207e97241 and later · before e08a3dcaca0505f861e344a387f37f94d95dbdc2affected · git
    • 624322f1adc58acd0b69f77a6ddc764207e97241 and later · before a4d7fedcaaf33e60a01e53eafca9041ef966212faffected · git
    • 624322f1adc58acd0b69f77a6ddc764207e97241 and later · before 4cdef96892f4fa6e70c405b6e8f2fd6972f3b64baffected · git
    • 624322f1adc58acd0b69f77a6ddc764207e97241 and later · before 129643893b79f8a3c6b72045f933fbab5ee424caaffected · git
    • before 5.6not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-89667Sep 11, 2026 · nfsd: close shrinker/GC/fsnotify vs per-net shutdown race in filecache
    32Monitor
  • ← EarlierCVE-2026-89668Sep 11, 2026 · nfsd: move nfsd_debugfs_init() after nfsd4_init_slabs() in init_nfsd()
    31Monitor
  • Later →CVE-2026-89670Sep 11, 2026 · nfsd: hold rcu across localio cmpxchg retry
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux129643893b79f8a3c6b72045f933fbab5ee424caVendor (CNA)
Linux Linux4415a692346a39fdb647cbd717eda510159aaf55Vendor (CNA)
Linux Linux4cdef96892f4fa6e70c405b6e8f2fd6972f3b64bVendor (CNA)
Linux Linux863b6e995665472f2af5be2436a874ab6a9e5ac6Vendor (CNA)
Linux Linux9caad13b7cfe9ccb90cc405ac77335800e086595Vendor (CNA)
Linux Linuxa4d7fedcaaf33e60a01e53eafca9041ef966212fVendor (CNA)
Linux Linuxd18d36395d973ef7372c8e6724970585f75b5c0bVendor (CNA)
Linux Linuxe08a3dcaca0505f861e344a387f37f94d95dbdc2Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
almalinux:kernel5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)

+20

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records