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TI-2023-02097 Aliases CVE-2023-2236GHSA-j4r5-9qqm-p694

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

Priority HIGH 69CWE-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. Impact type from CWE-416 and the CVSS impact.

Summary

A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local privilege escalation. Both io_install_fixed_file and its callers call fput in a file in case of an error, causing a reference underflow which leads to a use-after-free vulnerability. We recommend upgrading past commit 9d94c04c0db024922e886c9fd429659f22f48ea4.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00428 37th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Fixed Linux Kernel (Linux): 6.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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 Kernel5.19 to before 6.16.1Patch availableCNA
  • Linux Kernel VendorLinux Affected 5.19 to before 6.1 Fixed in 6.1 Patch available CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*5.19 to before 6.0.11VulnerableLinux
cpe:2.3:a:netapp:hci_baseboard_management_controller:h300s:*:*:*:*:*:*:*h300sVulnerableNetApp
cpe:2.3:a:netapp:hci_baseboard_management_controller:h410c:*:*:*:*:*:*:*h410cVulnerableNetApp
cpe:2.3:a:netapp:hci_baseboard_management_controller:h410s:*:*:*:*:*:*:*h410sVulnerableNetApp
cpe:2.3:a:netapp:hci_baseboard_management_controller:h500s:*:*:*:*:*:*:*h500sVulnerableNetApp
cpe:2.3:a:netapp:hci_baseboard_management_controller:h700s:*:*:*:*:*:*:*h700sVulnerableNetApp
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.19 to before 6.0.11 Vulnerable ·Linux
  • cpe:2.3:a:netapp:hci_baseboard_management_controller:h300s:*:*:*:*:*:*:* Versions h300s Vulnerable ·NetApp
  • cpe:2.3:a:netapp:hci_baseboard_management_controller:h410c:*:*:*:*:*:*:* Versions h410c Vulnerable ·NetApp
  • cpe:2.3:a:netapp:hci_baseboard_management_controller:h410s:*:*:*:*:*:*:* Versions h410s Vulnerable ·NetApp
  • cpe:2.3:a:netapp:hci_baseboard_management_controller:h500s:*:*:*:*:*:*:* Versions h500s Vulnerable ·NetApp
  • cpe:2.3:a:netapp:hci_baseboard_management_controller:h700s:*:*:*:*:*:*:* Versions h700s Vulnerable ·NetApp

Remediation

  • Fix · CNA Linux Kernel (Linux) Fixed in 6.1

Vendor assessments

Red Hat

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

Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-2236
  2. 2026-10-03 Alias added: GHSA-j4r5-9qqm-p694

References

Exploit 2

Advisory 1

  • 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