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TI-2026-60706 Aliases CVE-2026-89663GHSA-7jrm-g6vx-3834

nfsd: revoke copy-notify stateids before dropping their reference

Priority LOW 38Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 13 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

In the Linux kernel, the following vulnerability has been resolved: nfsd: revoke copy-notify stateids before dropping their reference Copy-notify stateids live in the s2s_cp_stateids IDR and on their parent stid's sc_cp_list, pinned by a single membership reference. _free_cpntf_state_locked() only unlinks an entry once its refcount reaches zero, so any revoke path that runs while a concurrent find_cpntf_state()/manage_cpntf_state() holder has elevated cs_count drops the reference without unlinking, leaving the entry discoverable with its membership reference already consumed. A second revoke or a laundromat tick then frees it while the reader still holds the pointer -- a KASAN-detectable use-after-free at the reader's nfs4_put_cpntf_state(). This affected all three revoke paths: - The parent-stid drain (nfs4_free_cpntf_statelist()) repeatedly called _free_cpntf_state_locked() on the first list entry; a holder that had bumped cs_count made it return early, so the next iteration re-decremented and burned the holder's reference. - OFFLOAD_CANCEL (manage_cpntf_state()) and laundromat expiry likewise used _free_cpntf_state_locked() and could drop 2->1 without unlinking. Add revoke_cpntf_state_locked(), which unhashes the entry from the IDR and sc_cp_list first (deferring the final free to any holder), and use it from all three revoke paths. The drain now walks with list_for_each_entry_safe() and revokes each entry unconditionally, so it terminates in one pass per entry regardless of cs_count. The unhash is gated on !list_empty(&cps->cp_list); the idr_remove() gate matters because idr_alloc_cyclic() may have recycled the so_id by then. Keep _free_cpntf_state_locked() for the reference-holder put path only, where a concurrent revoke may already have unlinked the entry (its list_del_init() then a no-op).

Why it matters now

EPSS 0.00455 39th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.270, 5.15.221, 6.1.188 +5Red Hat: 3 advisoriesRed Hat: 13 fixed, 2 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux5.6 and later5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3Patch availableCNA
  • Linux VendorLinux Affected 5.6 and later Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*——Linux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3

Red Hat 3 advisories

  • RHSA-2026:89197 Released 2026-10-27 · Red Hat rating Critical
    OpenShift Container Platform 4.22.20 bug fix and security update
    • Red Hat OpenShift Container Platform 4.22 rhcos-aarch64-4.22.9.8.202610241758-0, rhcos-ppc64le-4.22.9.8.202610241758-0, rhcos-s390x-4.22.9.8.202610241758-0 +1
  • RHSA-2026:77689 Released 2026-10-08 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.56.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.56.1.el9_8, kernel-64k-devel-5.14.0-687.56.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.56.1.el9_8, kernel-64k-5.14.0-687.56.1.el9_8, kernel-64k-core-5.14.0-687.56.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.56.1.el9_8, libperf-5.14.0-687.56.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.56.1.el9_8, kernel-rt-64k-5.14.0-687.56.1.el9_8, kernel-rt-64k-core-5.14.0-687.56.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.56.1.el9_8, kernel-rt-core-5.14.0-687.56.1.el9_8, kernel-rt-debug-5.14.0-687.56.1.el9_8 +9
  • RHSA-2026:77690 Released 2026-10-08 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • 10Base-SMTV kernel-modules-internal-6.12.0-211.64.1.el10_2
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.64.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.64.1.el10_2, kernel-64k-devel-6.12.0-211.64.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.64.1.el10_2, kernel-64k-6.12.0-211.64.1.el10_2, kernel-64k-core-6.12.0-211.64.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.64.1.el10_2, libperf-6.12.0-211.64.1.el10_2
    • Red Hat Enterprise Linux Hidden (v. 10) kernel-modules-internal-6.12.0-211.64.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.64.1.el10_2, kernel-rt-64k-6.12.0-211.64.1.el10_2, kernel-rt-64k-core-6.12.0-211.64.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.64.1.el10_2, kernel-rt-core-6.12.0-211.64.1.el10_2, kernel-rt-debug-6.12.0-211.64.1.el10_2 +9

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat OpenShift Container Platform 5AffectedNo fix yet
10Base-SMTVFixed RHSA-2026:77690
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:77690
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:77689
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:77690
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:77689
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:77690
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:77689
Red Hat Enterprise Linux Hidden (v. 10)Fixed RHSA-2026:77690
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:77690
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:77689
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:77690
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:77689
Red Hat OpenShift Container Platform 4.22Fixed RHSA-2026:89197
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat OpenShift Container Platform 4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-89663
  2. 2026-10-03 Alias added: GHSA-7jrm-g6vx-3834
  3. 2026-10-09 Fix available: RHSA-2026:77689 · Red Hat
  4. 2026-10-09 Fix available: RHSA-2026:77690 · Red Hat
  5. 2026-10-09 Fix available: 10Base-SMTV, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 9) +9 · Red Hat
  6. 2026-10-19 Fix available: Linux/[email protected] · CNA
  7. 2026-10-28 Fix available: Red Hat OpenShift Container Platform 4.22 · Red Hat
  8. 2026-10-29 Fix available: RHSA-2026:89197 · Red Hat
  9. 2026-10-30 Affected versions changed · Red Hat

References

Other 8

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
See all 21741 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences