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Fencer Vulns
high 7.8

CVE-2023-1281 json

UAF in Linux kernel's tcindex (traffic control index filter) implementation

published 2023-03-22 3 y ago modified 2026-07-30 3 mo ago also EUVD-2023-23548

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits
0
none known

Summary

Use After Free vulnerability in Linux kernel traffic control index filter (tcindex) allows Privilege Escalation. The imperfect hash area can be updated while packets are traversing, which will cause a use-after-free when 'tcf_exts_exec()' is called with the destroyed tcf_ext. A local attacker user can use this vulnerability to elevate its privileges to root.

This issue affects Linux Kernel: from 4.14 before git commit ee059170b1f7e94e55fa6cadee544e176a6e59c2.

Patch / fix

  • Linux Linux Kernel 5.10.169, 5.15.95, 6.1.13, 6.2.0
  • linux Debian 14, Debian 13, Debian 12 6.1.15-1

debian advisories DEBIAN-CVE-2023-1281

  • linux Ubuntu 18.04 LTS 4.15.0-209.220
  • linux Ubuntu 20.04 LTS 5.4.0-147.164
  • linux Ubuntu 22.04 LTS 5.15.0-70.77
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1154.167
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1100.108
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1034.38
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1103.112
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1032.40

ubuntu advisories UBUNTU-CVE-2023-1281

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 8 4.18.0-477.21.1.el8_8
  • perf RHEL 8 4.18.0-477.21.1.el8_8
  • bpftool RHEL 8 4.18.0-477.21.1.el8_8
  • kernel-core RHEL 8 4.18.0-477.21.1.el8_8
  • kernel-tools RHEL 8 4.18.0-477.21.1.el8_8
  • python3-perf RHEL 8 4.18.0-477.21.1.el8_8
  • kernel-modules RHEL 8 4.18.0-477.21.1.el8_8
  • kernel-zfcpdump RHEL 8 4.18.0-477.21.1.el8_8

red hat advisories RHSA-2023:4517RHSA-2023:4541RHSA-2023:4145RHSA-2023:4146RHSA-2023:4531RHSA-2023:4256

  • kernel-syms SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS +1 more 5.3.18-150200.24.148.1
  • kernel-source SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS +1 more 5.3.18-150200.24.148.1
  • kernel-default SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE Live Patching 15 SP2 +3 more 5.3.18-150200.24.148.1
  • kernel-preempt SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS +1 more 5.3.18-150200.24.148.1
  • kernel-obs-build SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS +1 more 5.3.18-150200.24.148.1
  • kernel-default-base SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS +1 more 5.3.18-150200.24.148.1.150200.9.71.1
  • dtb-aarch64 openSUSE Leap 15.4 5.3.18-150300.59.118.1
  • kernel-64kb SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS, SLE High Performance Computing 15 SP3-ESPOS +1 more 5.3.18-150300.59.118.1

suse advisories SUSE-SU-2023:4319-1SUSE-SU-2023:4280-1SUSE-SU-2023:4273-1SUSE-SU-2023:1800-1SUSE-SU-2023:1811-1SUSE-SU-2023:1892-1

  • kernel AlmaLinux 8 4.18.0-477.21.1.el8_8
  • perf AlmaLinux 8 4.18.0-477.21.1.el8_8
  • bpftool AlmaLinux 8 4.18.0-477.21.1.el8_8
  • kernel-core AlmaLinux 8 4.18.0-477.21.1.el8_8
  • kernel-tools AlmaLinux 8 4.18.0-477.21.1.el8_8
  • python3-perf AlmaLinux 8 4.18.0-477.21.1.el8_8
  • kernel-modules AlmaLinux 8 4.18.0-477.21.1.el8_8
  • kernel-zfcpdump AlmaLinux 8 4.18.0-477.21.1.el8_8

almalinux advisories ALSA-2023:4517ALSA-2023:4541

  • kernel-rt Rocky Linux 8 4.18.0-477.21.1.rt7.284.el8_8
  • kernel Rocky Linux 8 4.18.0-477.21.1.el8_8

rocky linux advisories RLSA-2023:4541RLSA-2023:4517

  • kernel CBL-Mariner 2.0 5.15.102.1-3

azure linux advisories AZL-25690

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-1281 updated cvss 7.8

kernel: tcindex: use-after-free vulnerability in traffic control index filter allows privilege escalation

  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: workaround, no fix planned “Will not fix”
  • Red Hat CodeReady Linux Builder EUS (v.8.6) kernel-debuginfo-common-x86_64 4.18.0-372.64.1.el8_6, kernel-debuginfo-common-aarch64 4.18.0-372.64.1.el8_6, kernel-debuginfo-common-ppc64le 4.18.0-372.64.1.el8_6
    fixed: vendor fix RHSA-2023:4130
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-477.21.1.el8_8, kernel 4.18.0-477.21.1.el8_8, bpftool 4.18.0-477.21.1.el8_8, kernel-core 4.18.0-477.21.1.el8_8, kernel-tools 4.18.0-477.21.1.el8_8, python3-perf 4.18.0-477.21.1.el8_8, +18 more
    fixed: vendor fix RHSA-2023:4517
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) perf 4.18.0-193.109.1.el8_2, kernel 4.18.0-193.109.1.el8_2, bpftool 4.18.0-193.109.1.el8_2, kernel-core 4.18.0-193.109.1.el8_2, kernel-tools 4.18.0-193.109.1.el8_2, python3-perf 4.18.0-193.109.1.el8_2, +8 more
    fixed: vendor fix RHSA-2023:4125
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.97.1.el8_4, kernel 4.18.0-305.97.1.el8_4, bpftool 4.18.0-305.97.1.el8_4, kernel-core 4.18.0-305.97.1.el8_4, kernel-tools 4.18.0-305.97.1.el8_4, python3-perf 4.18.0-305.97.1.el8_4, +8 more
    fixed: vendor fix RHSA-2023:4256
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.1) perf 4.18.0-147.85.1.el8_1, kernel 4.18.0-147.85.1.el8_1, bpftool 4.18.0-147.85.1.el8_1, kernel-core 4.18.0-147.85.1.el8_1, kernel-tools 4.18.0-147.85.1.el8_1, python3-perf 4.18.0-147.85.1.el8_1, +14 more
    fixed: vendor fix RHSA-2023:3852
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.2) perf 4.18.0-193.109.1.el8_2, kernel 4.18.0-193.109.1.el8_2, bpftool 4.18.0-193.109.1.el8_2, kernel-core 4.18.0-193.109.1.el8_2, kernel-tools 4.18.0-193.109.1.el8_2, python3-perf 4.18.0-193.109.1.el8_2, +13 more
    fixed: vendor fix RHSA-2023:4125
  • Red Hat Enterprise Linux BaseOS E4S (v.8.4) perf 4.18.0-305.97.1.el8_4, kernel 4.18.0-305.97.1.el8_4, bpftool 4.18.0-305.97.1.el8_4, kernel-core 4.18.0-305.97.1.el8_4, kernel-tools 4.18.0-305.97.1.el8_4, python3-perf 4.18.0-305.97.1.el8_4, +20 more
    fixed: vendor fix RHSA-2023:4256
show 11 more
  • Red Hat Enterprise Linux BaseOS EUS (v.8.6) perf 4.18.0-372.64.1.el8_6, kernel 4.18.0-372.64.1.el8_6, bpftool 4.18.0-372.64.1.el8_6, kernel-core 4.18.0-372.64.1.el8_6, kernel-tools 4.18.0-372.64.1.el8_6, python3-perf 4.18.0-372.64.1.el8_6, +21 more
    fixed: vendor fix RHSA-2023:4130
  • Red Hat Enterprise Linux BaseOS TUS (v. 8.2) perf 4.18.0-193.109.1.el8_2, kernel 4.18.0-193.109.1.el8_2, bpftool 4.18.0-193.109.1.el8_2, kernel-core 4.18.0-193.109.1.el8_2, kernel-tools 4.18.0-193.109.1.el8_2, python3-perf 4.18.0-193.109.1.el8_2, +8 more
    fixed: vendor fix RHSA-2023:4125
  • Red Hat Enterprise Linux BaseOS TUS (v.8.4) perf 4.18.0-305.97.1.el8_4, kernel 4.18.0-305.97.1.el8_4, bpftool 4.18.0-305.97.1.el8_4, kernel-core 4.18.0-305.97.1.el8_4, kernel-tools 4.18.0-305.97.1.el8_4, python3-perf 4.18.0-305.97.1.el8_4, +8 more
    fixed: vendor fix RHSA-2023:4256
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-477.21.1.el8_8, kernel-debuginfo-common-aarch64 4.18.0-477.21.1.el8_8, kernel-debuginfo-common-ppc64le 4.18.0-477.21.1.el8_8
    fixed: vendor fix RHSA-2023:4517
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-477.21.1.rt7.284.el8_8, kernel-rt-kvm 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-modules 4.18.0-477.21.1.rt7.284.el8_8, kernel-rt-debug-kvm 4.18.0-477.21.1.rt7.284.el8_8, kernel-rt-debug-core 4.18.0-477.21.1.rt7.284.el8_8, +4 more
    fixed: vendor fix RHSA-2023:4541
  • Red Hat Enterprise Linux NFV E4S (v.8.4) kernel-rt 4.18.0-305.97.1.rt7.172.el8_4, kernel-rt-kvm 4.18.0-305.97.1.rt7.172.el8_4, kernel-rt-core 4.18.0-305.97.1.rt7.172.el8_4, kernel-rt-modules 4.18.0-305.97.1.rt7.172.el8_4, kernel-rt-debug-kvm 4.18.0-305.97.1.rt7.172.el8_4, kernel-rt-debug-core 4.18.0-305.97.1.rt7.172.el8_4, +4 more Red Hat Enterprise Linux NFV TUS (v.8.4) kernel-rt 4.18.0-305.97.1.rt7.172.el8_4, kernel-rt-kvm 4.18.0-305.97.1.rt7.172.el8_4, kernel-rt-core 4.18.0-305.97.1.rt7.172.el8_4, kernel-rt-modules 4.18.0-305.97.1.rt7.172.el8_4, kernel-rt-debug-kvm 4.18.0-305.97.1.rt7.172.el8_4, kernel-rt-debug-core 4.18.0-305.97.1.rt7.172.el8_4, +4 more
    fixed: vendor fix RHSA-2023:4255
  • Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2) kernel-rt 4.18.0-193.109.1.rt13.160.el8_2, kernel-rt-kvm 4.18.0-193.109.1.rt13.160.el8_2, kernel-rt-core 4.18.0-193.109.1.rt13.160.el8_2, kernel-rt-modules 4.18.0-193.109.1.rt13.160.el8_2, kernel-rt-debug-kvm 4.18.0-193.109.1.rt13.160.el8_2, kernel-rt-debug-core 4.18.0-193.109.1.rt13.160.el8_2, +4 more Red Hat Enterprise Linux Real Time TUS (v. 8.2) kernel-rt 4.18.0-193.109.1.rt13.160.el8_2, kernel-rt-core 4.18.0-193.109.1.rt13.160.el8_2, kernel-rt-modules 4.18.0-193.109.1.rt13.160.el8_2, kernel-rt-debug-core 4.18.0-193.109.1.rt13.160.el8_2, kernel-rt-debug-modules 4.18.0-193.109.1.rt13.160.el8_2, kernel-rt-modules-extra 4.18.0-193.109.1.rt13.160.el8_2, +2 more
    fixed: vendor fix RHSA-2023:4126
  • 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-modules 4.18.0-477.21.1.rt7.284.el8_8, kernel-rt-debug-core 4.18.0-477.21.1.rt7.284.el8_8, kernel-rt-debug-modules 4.18.0-477.21.1.rt7.284.el8_8, kernel-rt-modules-extra 4.18.0-477.21.1.rt7.284.el8_8, +2 more
    fixed: vendor fix RHSA-2023:4541
  • Red Hat Enterprise Linux RT TUS (v.8.4) kernel-rt 4.18.0-305.97.1.rt7.172.el8_4, kernel-rt-core 4.18.0-305.97.1.rt7.172.el8_4, kernel-rt-modules 4.18.0-305.97.1.rt7.172.el8_4, kernel-rt-debug-core 4.18.0-305.97.1.rt7.172.el8_4, kernel-rt-debug-modules 4.18.0-305.97.1.rt7.172.el8_4, kernel-rt-modules-extra 4.18.0-305.97.1.rt7.172.el8_4, +2 more
    fixed: vendor fix RHSA-2023:4255
  • Red Hat Virtualization 4 Hypervisor for RHEL 8 perf 4.18.0-372.64.1.el8_6, kernel-debuginfo-common-x86_64 4.18.0-372.64.1.el8_6
    fixed: vendor fix RHSA-2023:4130
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
20 mo ago

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux Kernel

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.