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Fencer Vulns
high 7.8

CVE-2023-1829 json

Use-after-free in tcindex (traffic control index filter) in the Linux Kernel

published 2023-04-12 3 y ago modified 2026-07-29 3 mo ago also EUVD-2023-24031

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 64%
public exploits
0
none known

Summary

A use-after-free vulnerability in the Linux Kernel traffic control index filter (tcindex) can be exploited to achieve local privilege escalation. The tcindex_delete function which does not properly deactivate filters in case of a perfect hashes while deleting the underlying structure which can later lead to double freeing the structure. A local attacker user can use this vulnerability to elevate its privileges to root.

We recommend upgrading past commit 8c710f75256bb3cf05ac7b1672c82b92c43f3d28 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ .

Patch / fix

  • Linux Linux Kernel 4.14.308, 4.19.276, 5.4.235, 5.10.173, 5.15.100, 6.1.18, 6.2.5, 6.3.0
  • linux Debian 14, Debian 13, Debian 12 6.1.20-1

debian advisories DEBIAN-CVE-2023-1829

  • linux Ubuntu 18.04 LTS 4.15.0-210.221
  • linux Ubuntu 20.04 LTS 5.4.0-148.165
  • linux Ubuntu 22.04 LTS 5.15.0-71.78
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1155.168
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1101.109
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1035.39
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1104.113
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1034.42

ubuntu advisories UBUNTU-CVE-2023-1829

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-2023:4962RHSA-2023:4789RHSA-2023:7417RHSA-2023:7434

  • dtb-aarch64 openSUSE Leap 15.5 5.14.21-150500.55.68.1
  • kernel-64kb SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.68.1
  • kernel-syms SLE Module for Development Tools 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.68.1
  • kernel-obs-qa openSUSE Leap 15.5 5.14.21-150500.55.68.1
  • kernel-source SLE Module for Development Tools 15 SP5, SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.68.1
  • kernel-default SLE Workstation Extension 15 SP5, SLE Module for Legacy 15 SP5, SLE Module for Basesystem 15 SP5 +4 more 5.14.21-150500.55.68.1
  • kernel-kvmsmall openSUSE Leap 15.5 5.14.21-150500.55.68.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.68.1

suse advisories SUSE-SU-2025:0244-1SUSE-SU-2025:0240-1SUSE-SU-2025:0238-1SUSE-SU-2025:0137-1SUSE-SU-2025:0106-1SUSE-SU-2025:0103-1

  • suse-module-tools openSUSE Tumbleweed 16.0.36-1.1

opensuse advisories openSUSE-SU-2024:13281-1

  • 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 5.15.107.1-2

azure linux advisories AZL-26169

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-2023-1829 updated cvss 7.4

kernel: Use-after-free vulnerability in the Linux Kernel traffic control index filter

  • 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 4.18.0-372.70.1.el8_6, kernel-debuginfo-common-aarch64 4.18.0-372.70.1.el8_6, kernel-debuginfo-common-ppc64le 4.18.0-372.70.1.el8_6
    fixed: vendor fix RHSA-2023:4789
  • 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 4.18.0-193.119.1.el8_2, kernel 4.18.0-193.119.1.el8_2, bpftool 4.18.0-193.119.1.el8_2, kernel-core 4.18.0-193.119.1.el8_2, kernel-tools 4.18.0-193.119.1.el8_2, python3-perf 4.18.0-193.119.1.el8_2, +8 more
    fixed: vendor fix RHSA-2023:7434
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.103.1.el8_4, kernel 4.18.0-305.103.1.el8_4, bpftool 4.18.0-305.103.1.el8_4, kernel-core 4.18.0-305.103.1.el8_4, kernel-tools 4.18.0-305.103.1.el8_4, python3-perf 4.18.0-305.103.1.el8_4, +8 more
    fixed: vendor fix RHSA-2023:4962
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.1) perf 4.18.0-147.87.1.el8_1, kernel 4.18.0-147.87.1.el8_1, bpftool 4.18.0-147.87.1.el8_1, kernel-core 4.18.0-147.87.1.el8_1, kernel-tools 4.18.0-147.87.1.el8_1, python3-perf 4.18.0-147.87.1.el8_1, +14 more
    fixed: vendor fix RHSA-2023:4515
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.2) perf 4.18.0-193.119.1.el8_2, kernel 4.18.0-193.119.1.el8_2, bpftool 4.18.0-193.119.1.el8_2, kernel-core 4.18.0-193.119.1.el8_2, kernel-tools 4.18.0-193.119.1.el8_2, python3-perf 4.18.0-193.119.1.el8_2, +12 more
    fixed: vendor fix RHSA-2023:7434
  • Red Hat Enterprise Linux BaseOS E4S (v.8.4) perf 4.18.0-305.103.1.el8_4, kernel 4.18.0-305.103.1.el8_4, bpftool 4.18.0-305.103.1.el8_4, kernel-core 4.18.0-305.103.1.el8_4, kernel-tools 4.18.0-305.103.1.el8_4, python3-perf 4.18.0-305.103.1.el8_4, +21 more
    fixed: vendor fix RHSA-2023:4962
show 11 more
  • Red Hat Enterprise Linux BaseOS EUS (v.8.6) perf 4.18.0-372.70.1.el8_6, kernel 4.18.0-372.70.1.el8_6, bpftool 4.18.0-372.70.1.el8_6, kernel-core 4.18.0-372.70.1.el8_6, kernel-tools 4.18.0-372.70.1.el8_6, python3-perf 4.18.0-372.70.1.el8_6, +21 more
    fixed: vendor fix RHSA-2023:4789
  • Red Hat Enterprise Linux BaseOS TUS (v. 8.2) perf 4.18.0-193.119.1.el8_2, kernel 4.18.0-193.119.1.el8_2, bpftool 4.18.0-193.119.1.el8_2, kernel-core 4.18.0-193.119.1.el8_2, kernel-tools 4.18.0-193.119.1.el8_2, python3-perf 4.18.0-193.119.1.el8_2, +8 more
    fixed: vendor fix RHSA-2023:7434
  • Red Hat Enterprise Linux BaseOS TUS (v.8.4) perf 4.18.0-305.103.1.el8_4, kernel 4.18.0-305.103.1.el8_4, bpftool 4.18.0-305.103.1.el8_4, kernel-core 4.18.0-305.103.1.el8_4, kernel-tools 4.18.0-305.103.1.el8_4, python3-perf 4.18.0-305.103.1.el8_4, +8 more
    fixed: vendor fix RHSA-2023:4962
  • 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 4.18.0-305.103.1.rt7.178.el8_4, kernel-rt-kvm 4.18.0-305.103.1.rt7.178.el8_4, kernel-rt-core 4.18.0-305.103.1.rt7.178.el8_4, kernel-rt-modules 4.18.0-305.103.1.rt7.178.el8_4, kernel-rt-debug-kvm 4.18.0-305.103.1.rt7.178.el8_4, kernel-rt-debug-core 4.18.0-305.103.1.rt7.178.el8_4, +4 more Red Hat Enterprise Linux NFV TUS (v.8.4) kernel-rt 4.18.0-305.103.1.rt7.178.el8_4, kernel-rt-kvm 4.18.0-305.103.1.rt7.178.el8_4, kernel-rt-core 4.18.0-305.103.1.rt7.178.el8_4, kernel-rt-modules 4.18.0-305.103.1.rt7.178.el8_4, kernel-rt-debug-kvm 4.18.0-305.103.1.rt7.178.el8_4, kernel-rt-debug-core 4.18.0-305.103.1.rt7.178.el8_4, +4 more
    fixed: vendor fix RHSA-2023:4961
  • Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2) kernel-rt 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-kvm 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-core 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-modules 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-debug-kvm 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-debug-core 4.18.0-193.119.1.rt13.170.el8_2, +4 more Red Hat Enterprise Linux Real Time TUS (v. 8.2) kernel-rt 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-core 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-modules 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-debug-core 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-debug-modules 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-modules-extra 4.18.0-193.119.1.rt13.170.el8_2, +2 more
    fixed: vendor fix RHSA-2023:7431
  • 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 4.18.0-305.103.1.rt7.178.el8_4, kernel-rt-core 4.18.0-305.103.1.rt7.178.el8_4, kernel-rt-modules 4.18.0-305.103.1.rt7.178.el8_4, kernel-rt-debug-core 4.18.0-305.103.1.rt7.178.el8_4, kernel-rt-debug-modules 4.18.0-305.103.1.rt7.178.el8_4, kernel-rt-modules-extra 4.18.0-305.103.1.rt7.178.el8_4, +2 more
    fixed: vendor fix RHSA-2023:4961
  • Red Hat Virtualization 4 Hypervisor for RHEL 8 perf 4.18.0-372.70.1.el8_6, kernel-debuginfo-common-x86_64 4.18.0-372.70.1.el8_6
    fixed: vendor fix RHSA-2023:4789
  • 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
21 mo ago

Exploit prediction

1.06% chance of exploitation in the next 30 days, higher than 64% 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.