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TI-2026-46120 Aliases CVE-2026-64556GHSA-mpx2-cmqf-859j

perf/core: Detach event groups during remove_on_exec

Priority LOW 35CWE-662Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 14 fixed, 1 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: perf/core: Detach event groups during remove_on_exec perf_event_remove_on_exec() removes events by calling perf_event_exit_event(). For top-level events, this removes the event from the context with DETACH_EXIT only. This can leave inconsistent group state when a removed event is a group leader and the group contains siblings without remove_on_exec. If the group was active, the surviving siblings can remain active and attached to the removed leader's sibling list, but are no longer represented by a valid group leader on the PMU context active lists. A later close of the removed leader uses DETACH_GROUP and can promote the still-active siblings from this stale group state. The next schedule-in can then add an already-linked active_list entry again, corrupting the PMU context active list. With DEBUG_LIST enabled, this is caught as a list_add double-add in merge_sched_in(). Fix this by detaching group relationships when remove_on_exec removes an event. This preserves the existing task-exit and revoke behavior, while ensuring surviving siblings are ungrouped before the removed event leaves the context.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00162 5th percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.1.191, 6.6.145, 6.12.96 +3Red Hat: 4 advisoriesRed Hat: 14 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux5.13 and later6.1.191, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2Patch availableCNA
  • Linux VendorLinux Affected 5.13 and later Fixed in 6.1.191, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2 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 6.1.191, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2

Red Hat 4 advisories

  • RHSA-2026:72623 Released 2026-09-28 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.53.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.53.1.el9_8, kernel-64k-devel-5.14.0-687.53.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.53.1.el9_8, kernel-64k-5.14.0-687.53.1.el9_8, kernel-64k-core-5.14.0-687.53.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.53.1.el9_8, libperf-5.14.0-687.53.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.53.1.el9_8, kernel-rt-64k-5.14.0-687.53.1.el9_8, kernel-rt-64k-core-5.14.0-687.53.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.53.1.el9_8, kernel-rt-core-5.14.0-687.53.1.el9_8, kernel-rt-debug-5.14.0-687.53.1.el9_8 +9
  • RHSA-2026:72624 Released 2026-09-28 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.61.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.61.1.el10_2, kernel-64k-devel-6.12.0-211.61.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.61.1.el10_2, kernel-64k-6.12.0-211.61.1.el10_2, kernel-64k-core-6.12.0-211.61.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.61.1.el10_2, libperf-6.12.0-211.61.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.61.1.el10_2, kernel-rt-64k-6.12.0-211.61.1.el10_2, kernel-rt-64k-core-6.12.0-211.61.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.61.1.el10_2, kernel-rt-core-6.12.0-211.61.1.el10_2, kernel-rt-debug-6.12.0-211.61.1.el10_2 +9
  • RHSA-2026:72468 Released 2026-09-28 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.169.1.el8_10, kernel-4.18.0-553.169.1.el8_10, kernel-abi-stablelists-4.18.0-553.169.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.169.1.el8_10
Show 1 more Red Hat advisories
  • RHSA-2026:72467 Released 2026-09-28 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.169.1.rt7.510.el8_10, kernel-rt-core-4.18.0-553.169.1.rt7.510.el8_10, kernel-rt-debug-4.18.0-553.169.1.rt7.510.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.169.1.rt7.510.el8_10, kernel-rt-core-4.18.0-553.169.1.rt7.510.el8_10, kernel-rt-debug-4.18.0-553.169.1.rt7.510.el8_10 +7

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 Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:72624
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:72623
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:72624
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:72468
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:72623
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:72468
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:72624
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:72623
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:72467
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:72467
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:72624
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:72623
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:72624
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:72623
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-64556
  2. 2026-10-03 Alias added: GHSA-mpx2-cmqf-859j
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-20 Weakness changed · CISA ADP
  5. 2026-10-30 Fix available: Linux/Linux@1d3e1102273f09180262496658e7eeed8a5a7b59, Linux/[email protected] · CNA
  6. 2026-10-30 1 new reference · CNA

References

Other 6

  • 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