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TI-2023-02096 Aliases CVE-2023-2235GHSA-hwwj-xrc2-6hxg

Use-after-free in Linux kernel's Performance Events subsystem

Priority LOW 36CWE-416Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

A use-after-free vulnerability in the Linux Kernel Performance Events system can be exploited to achieve local privilege escalation. The perf_group_detach function did not check the event's siblings' attach_state before calling add_event_to_groups(), but remove_on_exec made it possible to call list_del_event() on before detaching from their group, making it possible to use a dangling pointer causing a use-after-free vulnerability. We recommend upgrading past commit fd0815f632c24878e325821943edccc7fde947a2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0025 16th percentileScored 2026-11-07
Fix Fixed Linux Kernel (Linux): 6.3Red Hat: 8 advisories

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
LinuxLinux Kernel5.13 to before 6.36.3Patch availableCNA
  • Linux Kernel VendorLinux Affected 5.13 to before 6.3 Fixed in 6.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*5.13 to before 5.15.104; 5.16 to before 6.1.21; 6.2 to before 6.2.8VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.13 to before 5.15.104; 5.16 to before 6.1.21; 6.2 to before 6.2.8 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux Kernel (Linux) Fixed in 6.3

Red Hat 8 advisories

  • RHSA-2023:5627 Released 2023-10-10 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v.8.6) kernel-tools-libs-devel-4.18.0-372.75.1.el8_6
    • Red Hat Enterprise Linux BaseOS EUS (v.8.6) bpftool-4.18.0-372.75.1.el8_6, kernel-4.18.0-372.75.1.el8_6, kernel-abi-stablelists-4.18.0-372.75.1.el8_6 +19
    • Red Hat Virtualization 4 Hypervisor for RHEL 8 kernel-devel-4.18.0-372.75.1.el8_6, perf-4.18.0-372.75.1.el8_6
  • RHSA-2023:4517 Released 2023-08-08 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-477.21.1.el8_8, kernel-4.18.0-477.21.1.el8_8, kernel-abi-stablelists-4.18.0-477.21.1.el8_8 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-477.21.1.el8_8
  • RHSA-2023:4541 Released 2023-08-08 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-477.21.1.rt7.284.el8_8, kernel-rt-core-4.18.0-477.21.1.rt7.284.el8_8, kernel-rt-debug-4.18.0-477.21.1.rt7.284.el8_8 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-477.21.1.rt7.284.el8_8, kernel-rt-core-4.18.0-477.21.1.rt7.284.el8_8, kernel-rt-debug-4.18.0-477.21.1.rt7.284.el8_8 +7
Show 5 more Red Hat advisories
  • RHSA-2023:4137 Released 2023-07-18 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat CodeReady Linux Builder EUS (v.9.0) kernel-tools-libs-devel-5.14.0-70.64.1.el9_0
    • Red Hat Enterprise Linux AppStream EUS (v.9.0) kernel-debug-devel-5.14.0-70.64.1.el9_0, kernel-debug-devel-matched-5.14.0-70.64.1.el9_0, kernel-devel-5.14.0-70.64.1.el9_0 +5
    • Red Hat Enterprise Linux BaseOS EUS (v.9.0) bpftool-5.14.0-70.64.1.el9_0, kernel-5.14.0-70.64.1.el9_0, kernel-abi-stablelists-5.14.0-70.64.1.el9_0 +14
  • RHSA-2023:4138 Released 2023-07-18 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time EUS (v.9.0) kernel-rt-5.14.0-70.64.1.rt21.135.el9_0, kernel-rt-core-5.14.0-70.64.1.rt21.135.el9_0, kernel-rt-debug-5.14.0-70.64.1.rt21.135.el9_0 +7
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0) kernel-rt-5.14.0-70.64.1.rt21.135.el9_0, kernel-rt-core-5.14.0-70.64.1.rt21.135.el9_0, kernel-rt-debug-5.14.0-70.64.1.rt21.135.el9_0 +9
  • RHSA-2023:3708 Released 2023-06-21 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux NFV (v. 9) kernel-rt-5.14.0-284.18.1.rt14.303.el9_2, kernel-rt-core-5.14.0-284.18.1.rt14.303.el9_2, kernel-rt-debug-5.14.0-284.18.1.rt14.303.el9_2 +11
    • Red Hat Enterprise Linux RT (v. 9) kernel-rt-5.14.0-284.18.1.rt14.303.el9_2, kernel-rt-core-5.14.0-284.18.1.rt14.303.el9_2, kernel-rt-debug-5.14.0-284.18.1.rt14.303.el9_2 +9
  • RHSA-2023:3723 Released 2023-06-21 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-284.18.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.18.1.el9_2, kernel-64k-devel-5.14.0-284.18.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS (v. 9) bpftool-7.0.0-284.18.1.el9_2, kernel-5.14.0-284.18.1.el9_2, kernel-64k-5.14.0-284.18.1.el9_2 +29
    • Red Hat Enterprise Linux CRB (v. 9) kernel-tools-libs-devel-5.14.0-284.18.1.el9_2
  • RHSA-2023:3705 Released 2023-06-21 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux BaseOS (v. 9) kpatch-patch-5_14_0-284_11_1-1-1.el9_2

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat CodeReady Linux Builder EUS (v.8.6)Fixed RHSA-2023:5627
Red Hat CodeReady Linux Builder EUS (v.9.0)Fixed RHSA-2023:4137
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2023:3723
Red Hat Enterprise Linux AppStream EUS (v.9.0)Fixed RHSA-2023:4137
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2023:4517
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2023:3705, RHSA-2023:3723
Red Hat Enterprise Linux BaseOS EUS (v.8.6)Fixed RHSA-2023:5627
Red Hat Enterprise Linux BaseOS EUS (v.9.0)Fixed RHSA-2023:4137
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2023:4517
Red Hat Enterprise Linux CRB (v. 9)Fixed RHSA-2023:3723
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2023:4541
Red Hat Enterprise Linux NFV (v. 9)Fixed RHSA-2023:3708
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2023:4541
Red Hat Enterprise Linux RT (v. 9)Fixed RHSA-2023:3708
Red Hat Enterprise Linux Real Time EUS (v.9.0)Fixed RHSA-2023:4138
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)Fixed RHSA-2023:4138
Red Hat Virtualization 4 Hypervisor for RHEL 8Fixed RHSA-2023:5627
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux AppStream (v. 9)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-2235
  2. 2026-10-03 Alias added: GHSA-hwwj-xrc2-6hxg

References

Patch 2

  • 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-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
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

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