CVE-2023-4921
Use-after-free in Linux kernel's net/sched: sch_qfq component
02 Description
Use-after-free in Linux kernel's net/sched: sch_qfq component
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 0.41% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 35.9% of scored records. A rank, not a probability.
- NVD base score
- 7.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-10-14.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2023-09-12 19:45Z3 YR AGO
- Last updated
- 2026-10-14 21:49Z14 DAYS AGO
- Reserved
- 2023-09-12
- Assigning CNA
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.8)
- CNA CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-416Use After FreeVariant
- Data version
- 5.2
- Document digest
- af3230f157669232dc6b6cc8474a49ae5623bb7a7e65709d3e49d10bb6945e33
05 Affected products
06 References
- git.kernel.orghttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8fc134fee27f2263988ae38920bc03da416b03d8
- kernel.dancehttps://kernel.dance/8fc134fee27f2263988ae38920bc03da416b03d8
- lists.debian.orghttps://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
- lists.debian.orghttps://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-794697.html
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-769027.html
07 Fixed in
AlmaLinux 8
- bpftool Fixed in 4.18.0-513.18.1.el8_9
- kernel Fixed in 4.18.0-513.18.1.el8_9
- kernel-abi-stablelists Fixed in 4.18.0-513.18.1.el8_9
- kernel-core Fixed in 4.18.0-513.18.1.el8_9
- kernel-cross-headers Fixed in 4.18.0-513.18.1.el8_9
- kernel-debug Fixed in 4.18.0-513.18.1.el8_9
- kernel-debug-core Fixed in 4.18.0-513.18.1.el8_9
- kernel-debug-devel Fixed in 4.18.0-513.18.1.el8_9
- kernel-debug-modules Fixed in 4.18.0-513.18.1.el8_9
- kernel-debug-modules-extra Fixed in 4.18.0-513.18.1.el8_9
- kernel-devel Fixed in 4.18.0-513.18.1.el8_9
- kernel-doc Fixed in 4.18.0-513.18.1.el8_9
- kernel-modules Fixed in 4.18.0-513.18.1.el8_9
- kernel-modules-extra Fixed in 4.18.0-513.18.1.el8_9
- kernel-tools Fixed in 4.18.0-513.18.1.el8_9
- kernel-tools-libs Fixed in 4.18.0-513.18.1.el8_9
- kernel-tools-libs-devel Fixed in 4.18.0-513.18.1.el8_9
- kernel-zfcpdump Fixed in 4.18.0-513.18.1.el8_9
- kernel-zfcpdump-core Fixed in 4.18.0-513.18.1.el8_9
- kernel-zfcpdump-devel Fixed in 4.18.0-513.18.1.el8_9
- kernel-zfcpdump-modules Fixed in 4.18.0-513.18.1.el8_9
- kernel-zfcpdump-modules-extra Fixed in 4.18.0-513.18.1.el8_9
- perf Fixed in 4.18.0-513.18.1.el8_9
- python3-perf Fixed in 4.18.0-513.18.1.el8_9
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- bpftool Fixed in 4.18.0-513.18.1.el8_9
- kernel Fixed in 4.18.0-513.18.1.el8_9
- kernel-abi-stablelists Fixed in 4.18.0-513.18.1.el8_9
- kernel-core Fixed in 4.18.0-513.18.1.el8_9
- kernel-cross-headers Fixed in 4.18.0-513.18.1.el8_9
- kernel-debug Fixed in 4.18.0-513.18.1.el8_9
- kernel-debug-core Fixed in 4.18.0-513.18.1.el8_9
- kernel-debug-devel Fixed in 4.18.0-513.18.1.el8_9
- kernel-debug-modules Fixed in 4.18.0-513.18.1.el8_9
- kernel-debug-modules-extra Fixed in 4.18.0-513.18.1.el8_9
- kernel-devel Fixed in 4.18.0-513.18.1.el8_9
- kernel-doc Fixed in 4.18.0-513.18.1.el8_9
- kernel-modules Fixed in 4.18.0-513.18.1.el8_9
- kernel-modules-extra Fixed in 4.18.0-513.18.1.el8_9
- kernel-tools Fixed in 4.18.0-513.18.1.el8_9
- kernel-tools-libs Fixed in 4.18.0-513.18.1.el8_9
- kernel-tools-libs-devel Fixed in 4.18.0-513.18.1.el8_9
- kernel-zfcpdump Fixed in 4.18.0-513.18.1.el8_9
- kernel-zfcpdump-core Fixed in 4.18.0-513.18.1.el8_9
- kernel-zfcpdump-devel Fixed in 4.18.0-513.18.1.el8_9
- kernel-zfcpdump-modules Fixed in 4.18.0-513.18.1.el8_9
- kernel-zfcpdump-modules-extra Fixed in 4.18.0-513.18.1.el8_9
- perf Fixed in 4.18.0-513.18.1.el8_9
- python3-perf Fixed in 4.18.0-513.18.1.el8_9
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- linux Fixed in 6.1.55-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- linux Fixed in 6.5.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- linux Fixed in 6.5.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- linux-hwe-edge No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- linux-aws-5.0 No fix yet
- linux-aws-5.3 No fix yet
- linux-azure No fix yet
- linux-azure-5.3 No fix yet
- linux-azure-edge No fix yet
- linux-gcp No fix yet
- linux-gcp-5.3 No fix yet
- linux-gke-4.15 No fix yet
- linux-gke-5.4 No fix yet
- linux-gkeop-5.4 No fix yet
- linux-hwe No fix yet
- linux-hwe-edge No fix yet
- linux-oem No fix yet
- linux-oracle-5.0 No fix yet
- linux-oracle-5.3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- linux Fixed in 5.4.0-165.182
- linux-aws Fixed in 5.4.0-1112.121
- linux-aws-5.11 No fix yet
- linux-aws-5.13 No fix yet
- linux-aws-5.15 Fixed in 5.15.0-1048.53~20.04.1
- linux-aws-5.8 No fix yet
- linux-azure Fixed in 5.4.0-1118.125
- linux-azure-5.11 No fix yet
- linux-azure-5.13 No fix yet
- linux-azure-5.15 Fixed in 5.15.0-1050.57~20.04.1
- linux-azure-5.8 No fix yet
- linux-azure-fde No fix yet
- linux-bluefield Fixed in 5.4.0-1073.79
- linux-gcp Fixed in 5.4.0-1116.125
- linux-gcp-5.11 No fix yet
- linux-gcp-5.13 No fix yet
- linux-gcp-5.15 Fixed in 5.15.0-1045.53~20.04.2
- linux-gcp-5.8 No fix yet
- linux-gke No fix yet
- linux-gke-5.15 No fix yet
- linux-gkeop Fixed in 5.4.0-1079.83
- linux-gkeop-5.15 Fixed in 5.15.0-1031.37~20.04.1
- linux-hwe-5.11 No fix yet
- linux-hwe-5.13 No fix yet
- linux-hwe-5.15 Fixed in 5.15.0-87.97~20.04.1
- linux-hwe-5.8 No fix yet
- linux-ibm Fixed in 5.4.0-1059.64
- linux-ibm-5.15 Fixed in 5.15.0-1041.44~20.04.1
- linux-intel-5.13 No fix yet
- linux-intel-iotg-5.15 Fixed in 5.15.0-1043.49~20.04.1
- linux-iot Fixed in 5.4.0-1024.25
- linux-kvm Fixed in 5.4.0-1101.107
- linux-lowlatency-hwe-5.15 Fixed in 5.15.0-87.96~20.04.1
- linux-nvidia-tegra-5.15 Fixed in 5.15.0-1019.19~20.04.1
- linux-oem-5.10 No fix yet
- linux-oem-5.13 No fix yet
- linux-oem-5.14 No fix yet
- linux-oem-5.6 No fix yet
- linux-oracle Fixed in 5.4.0-1111.120
- linux-oracle-5.11 No fix yet
10 further packages in Ubuntu 20.04 LTS not shown (first 40 listed).
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- linux Fixed in 5.15.0-87.97
- linux-allwinner-5.19 No fix yet
- linux-aws Fixed in 5.15.0-1048.53
- linux-aws-5.19 No fix yet
- linux-aws-6.2 Fixed in 6.2.0-1014.14~22.04.1
- linux-aws-6.5 No fix yet
- linux-azure Fixed in 5.15.0-1050.57
- linux-azure-5.19 No fix yet
- linux-azure-6.2 Fixed in 6.2.0-1015.15~22.04.1
- linux-azure-6.5 No fix yet
- linux-azure-fde Fixed in 5.15.0-1050.57.1
- linux-azure-fde-5.19 No fix yet
- linux-azure-fde-6.2 Fixed in 6.2.0-1015.15~22.04.1.1
- linux-gcp Fixed in 5.15.0-1045.53
- linux-gcp-5.19 No fix yet
- linux-gcp-6.2 Fixed in 6.2.0-1017.19~22.04.1
- linux-gke Fixed in 5.15.0-1045.50
- linux-gkeop Fixed in 5.15.0-1031.37
- linux-hwe-5.19 No fix yet
- linux-hwe-6.2 Fixed in 6.2.0-35.35~22.04.1
- linux-ibm Fixed in 5.15.0-1041.44
- linux-intel-iotg Fixed in 5.15.0-1043.49
- linux-kvm Fixed in 5.15.0-1045.50
- linux-lowlatency Fixed in 5.15.0-87.96
- linux-lowlatency-hwe-5.19 No fix yet
- linux-lowlatency-hwe-6.2 Fixed in 6.2.0-1015.15~22.04.1
- linux-nvidia Fixed in 5.15.0-1039.39
- linux-nvidia-6.2 Fixed in 6.2.0-1011.11
- linux-nvidia-6.5 Fixed in 6.5.0-1007.7
- linux-nvidia-tegra Fixed in 5.15.0-1019.19
- linux-nvidia-tegra-igx Fixed in 5.15.0-1006.6
- linux-oem-5.17 No fix yet
- linux-oem-6.0 No fix yet
- linux-oem-6.1 Fixed in 6.1.0-1025.25
- linux-oem-6.5 Fixed in 6.5.0-1007.7
- linux-oracle Fixed in 5.15.0-1046.52
- linux-raspi Fixed in 5.15.0-1041.44
- linux-realtime No fix yet
- linux-riscv No fix yet
- linux-riscv-5.19 No fix yet
3 further packages in Ubuntu 22.04 LTS not shown (first 40 listed).
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- linux-raspi-realtime No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Nvidia-BlueField 22.04 LTS
- linux-bluefield Fixed in 5.15.0-1028.30
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- linux Fixed in 3.13.0-197.248Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-aws Fixed in 4.4.0-1124.130Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure Fixed in 4.15.0-1171.186~14.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-lts-xenial Fixed in 4.4.0-246.280~14.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- linux Fixed in 4.4.0-246.280Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-aws Fixed in 4.4.0-1162.177Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-aws-hwe Fixed in 4.15.0-1162.175~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure Fixed in 4.15.0-1171.186~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-gcp Fixed in 4.15.0-1156.173~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-hwe Fixed in 4.15.0-219.230~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-kvm Fixed in 4.4.0-1125.135Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-oracle Fixed in 4.15.0-1125.136~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- linux Fixed in 4.15.0-219.230Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-aws Fixed in 4.15.0-1162.175Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-aws-5.4 Fixed in 5.4.0-1112.121~18.04.2Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure-4.15 Fixed in 4.15.0-1171.186Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure-5.4 Fixed in 5.4.0-1118.125~18.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-gcp-4.15 Fixed in 4.15.0-1156.173Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-gcp-5.4 Fixed in 5.4.0-1116.125~18.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-hwe-5.4 Fixed in 5.4.0-165.182~18.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-ibm-5.4 Fixed in 5.4.0-1059.64~18.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-kvm Fixed in 4.15.0-1146.151Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-oracle Fixed in 4.15.0-1125.136Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-oracle-5.4 Fixed in 5.4.0-1111.120~18.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-raspi-5.4 Fixed in 5.4.0-1096.107~18.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS-preview 22.04 LTS
- linux-fips No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS-updates 16.04 LTS
- linux-fips Fixed in 4.4.0-1094.101Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS-updates 18.04 LTS
- linux-aws-fips Fixed in 4.15.0-2101.107Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 4.15.0-2080.86Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 4.15.0-1117.128Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 4.15.0-2064.69Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS-updates 20.04 LTS
- linux-aws-fips Fixed in 5.4.0-1112.121+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 5.4.0-1118.125+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 5.4.0-1087.96Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 5.4.0-1116.125+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS 16.04 LTS
- linux-fips No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS 18.04 LTS
- linux-aws-fips No fix yet
- linux-azure-fips No fix yet
- linux-fips No fix yet
- linux-gcp-fips No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS 20.04 LTS
- linux-aws-fips No fix yet
- linux-azure-fips No fix yet
- linux-fips No fix yet
- linux-gcp-fips No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro Realtime 22.04 LTS
- linux-intel-iot-realtime Fixed in 5.15.0-1041.43Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-realtime Fixed in 5.15.0-1049.55Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.