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TI-2026-52535 Aliases CVE-2026-74753GHSA-4mpw-g9mg-jrm7

perf: Reject exited events as group leaders

Priority LOW 35Published · 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, 3 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: Reject exited events as group leaders perf_event_remove_on_exec() sets remove-on-exec events to the EXIT state and detaches their group relationships. The event's file descriptor can remain open, however, and perf_event_open() currently accepts that event as a group leader because its early validation rejects only REVOKED and DEAD events. A new sibling can consequently be linked to the detached leader. When the leader is closed, perf_group_detach() observes that its PERF_ATTACH_GROUP bit is already clear and skips the new sibling. The sibling then retains a group_leader pointer to the freed event. Reject group leaders in the EXIT state. Perform the check while holding the shared context mutex so that an exec in the target task cannot detach the leader between validation and group attachment. [peterz: make the earlier test fully consistent]

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00129 2nd percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.2, 6.6.156, 6.12.108 +2Red Hat: 4 advisoriesRed Hat: 14 fixed, 3 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
LinuxLinux6.1.191 to before 6.26.2Patch availableCNA
LinuxLinux6.6.145 to before 6.6.156; 6.12.96 to before 6.12.108; 6.18.39 to before 6.18.46; 7.1.4 to before 7.1.106.6.156, 6.12.108, 6.18.46, 7.1.10Patch availableCNA
  • Linux VendorLinux Affected 6.1.191 to before 6.2 Fixed in 6.2 Patch available CNA
  • Linux VendorLinux Affected 6.6.145 to before 6.6.156; 6.12.96 to before 6.12.108; 6.18.39 to before 6.18.46; 7.1.4 to before 7.1.10 Fixed in 6.6.156, 6.12.108, 6.18.46, 7.1.10 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 6.2
  • Fix · CNA Linux (Linux) Fixed in 6.6.156, 6.12.108, 6.18.46, 7.1.10

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 6AffectedNo fix yet
Red Hat Enterprise Linux 7AffectedNo fix yet
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

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-74753
  2. 2026-10-03 Alias added: GHSA-4mpw-g9mg-jrm7
  3. 2026-10-18 CISA SSVC decision points changed
  4. 2026-10-30 Fix available: Linux/[email protected] · CNA

References

Other 5

  • 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