01 Record
CVE-2026-23406
apparmor: fix side-effect bug in match_char() macro usage
HighPUBLISHEDCNA: Linux
CNA base score7.8 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
02 Description
apparmor: fix side-effect bug in match_char() macro usage
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 0.17% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 7.2% 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
- Analyzed. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Low. 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
- 2026-04-01 08:36Z7 MO AGO
- Last updated
- 2026-08-05 12:21Z2 MO AGO
- Reserved
- 2026-01-13
- Assigning CNA
- Linux
- 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
- Data version
- 5.2
- Document digest
- a5cb4cea03b20dce0b73c27b6de717aecd63b1c63d0467a94da88971a48ea51c
05 Affected products
VendorProductVersionsPlatforms
LinuxLinux074c1cd798cb0b481d7eaa749b64aa416563c053 to < c7dc56d8b37eda1396feeec3ab1c7ecee5eae31b, 074c1cd798cb0b481d7eaa749b64aa416563c053 to < f16f2e5936c0f5f0d11fdf10d2be3e47e7108e42, 074c1cd798cb0b481d7eaa749b64aa416563c053 to < 1fc94f16098213d01e56c97feed9b3ecf0147a37, 074c1cd798cb0b481d7eaa749b64aa416563c053 to < 5a184f7cbdeaad17e16dedf3c17d0cd622edfed8, 074c1cd798cb0b481d7eaa749b64aa416563c053 to < b73c1dff8a9d7eeaebabf8097a5b2de192f40913, 074c1cd798cb0b481d7eaa749b64aa416563c053 to < 0510d1ba0976f97f521feb2b75b0572ea5df3ceb, 074c1cd798cb0b481d7eaa749b64aa416563c053 to < 383b7270faf42564f133134c2fc3c24bbae52615, 074c1cd798cb0b481d7eaa749b64aa416563c053 to < 8756b68edae37ff546c02091989a4ceab3f20abd, 4.17—
06 References
- git.kernel.orghttps://git.kernel.org/stable/c/c7dc56d8b37eda1396feeec3ab1c7ecee5eae31b
- git.kernel.orghttps://git.kernel.org/stable/c/f16f2e5936c0f5f0d11fdf10d2be3e47e7108e42
- git.kernel.orghttps://git.kernel.org/stable/c/1fc94f16098213d01e56c97feed9b3ecf0147a37
- git.kernel.orghttps://git.kernel.org/stable/c/5a184f7cbdeaad17e16dedf3c17d0cd622edfed8
- git.kernel.orghttps://git.kernel.org/stable/c/b73c1dff8a9d7eeaebabf8097a5b2de192f40913
- git.kernel.orghttps://git.kernel.org/stable/c/0510d1ba0976f97f521feb2b75b0572ea5df3ceb
- git.kernel.orghttps://git.kernel.org/stable/c/383b7270faf42564f133134c2fc3c24bbae52615
- git.kernel.orghttps://git.kernel.org/stable/c/8756b68edae37ff546c02091989a4ceab3f20abd
07 Fixed in
Debian 12
- linux Fixed in 6.1.164-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- linux Fixed in 6.12.74-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- linux Fixed in 6.19.6-2
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-aws-5.11 No fix yet
- linux-aws-5.13 No fix yet
- linux-aws-5.8 No fix yet
- linux-azure-5.11 No fix yet
- linux-azure-5.13 No fix yet
- linux-azure-5.8 No fix yet
- linux-azure-fde No fix yet
- linux-gcp-5.11 No fix yet
- linux-gcp-5.13 No fix yet
- linux-gcp-5.8 No fix yet
- linux-gke No fix yet
- linux-gke-5.15 No fix yet
- linux-gkeop No fix yet
- linux-gkeop-5.15 No fix yet
- linux-hwe-5.11 No fix yet
- linux-hwe-5.13 No fix yet
- linux-hwe-5.8 No fix yet
- linux-intel-5.13 No fix yet
- 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-5.11 No fix yet
- linux-oracle-5.13 No fix yet
- linux-oracle-5.8 No fix yet
- linux-raspi2 No fix yet
- linux-riscv No fix yet
- linux-riscv-5.11 No fix yet
- linux-riscv-5.8 No fix yet
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 5.15.0-173.183
- linux-allwinner-5.19 No fix yet
- linux-aws Fixed in 5.15.0-1103.110
- linux-aws-5.19 No fix yet
- linux-aws-6.2 No fix yet
- linux-aws-6.5 No fix yet
- linux-aws-6.8 Fixed in 6.8.0-1050.53~22.04.1
- linux-azure Fixed in 5.15.0-1109.118
- linux-azure-5.19 No fix yet
- linux-azure-6.2 No fix yet
- linux-azure-6.5 No fix yet
- linux-azure-6.8 Fixed in 6.8.0-1051.57~22.04.1
- linux-azure-fde Fixed in 5.15.0-1109.118.1
- linux-azure-fde-5.19 No fix yet
- linux-azure-fde-6.2 No fix yet
- linux-azure-fde-6.8 Fixed in 6.8.0-1058.65~22.04.1
- linux-gcp Fixed in 5.15.0-1103.112
- linux-gcp-5.19 No fix yet
- linux-gcp-6.2 No fix yet
- linux-gcp-6.5 No fix yet
- linux-gcp-6.8 Fixed in 6.8.0-1052.55~22.04.1
- linux-gke Fixed in 5.15.0-1099.105
- linux-gkeop Fixed in 5.15.0-1086.94
- linux-hwe-5.19 No fix yet
- linux-hwe-6.2 No fix yet
- linux-hwe-6.5 No fix yet
- linux-hwe-6.8 Fixed in 6.8.0-106.106~22.04.1
- linux-ibm Fixed in 5.15.0-1097.100
- linux-ibm-6.8 Fixed in 6.8.0-1049.49~22.04.1
- linux-intel-iot-realtime No fix yet
- linux-intel-iotg Fixed in 5.15.0-1098.104
- linux-kvm Fixed in 5.15.0-1095.100
- linux-lowlatency Fixed in 5.15.0-173.183
- linux-lowlatency-hwe-5.19 No fix yet
- linux-lowlatency-hwe-6.2 No fix yet
- linux-lowlatency-hwe-6.5 No fix yet
- linux-lowlatency-hwe-6.8 Fixed in 6.8.0-106.106.1~22.04.1
- linux-nvidia Fixed in 5.15.0-1098.99
- linux-nvidia-6.2 No fix yet
- linux-nvidia-6.5 No fix yet
20 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 Fixed in 6.8.0-106.106
- linux-aws Fixed in 6.8.0-1050.53
- linux-aws-6.14 No fix yet
- linux-aws-6.17 Fixed in 6.17.0-1009.9~24.04.2
- linux-azure Fixed in 6.8.0-1051.57
- linux-azure-6.11 No fix yet
- linux-azure-6.14 No fix yet
- linux-azure-6.17 Fixed in 6.17.0-1010.10~24.04.1
- linux-azure-fde Fixed in 6.8.0-1058.65
- linux-azure-fde-6.14 No fix yet
- linux-azure-nvidia No fix yet
- linux-azure-nvidia-6.14 No fix yet
- linux-gcp Fixed in 6.8.0-1052.55
- linux-gcp-6.11 No fix yet
- linux-gcp-6.14 No fix yet
- linux-gcp-6.17 Fixed in 6.17.0-1009.9~24.04.3
- linux-gke Fixed in 6.8.0-1048.53
- linux-gkeop Fixed in 6.8.0-1035.38
- linux-hwe-6.11 No fix yet
- linux-hwe-6.14 No fix yet
- linux-hwe-6.17 Fixed in 6.17.0-19.19~24.04.2
- linux-ibm Fixed in 6.8.0-1049.49
- linux-lowlatency Fixed in 6.8.0-106.106.1
- linux-lowlatency-hwe-6.11 No fix yet
- linux-nvidia Fixed in 6.8.0-1049.52
- linux-nvidia-6.11 No fix yet
- linux-nvidia-6.17 Fixed in 6.17.0-1014.14
- linux-nvidia-lowlatency Fixed in 6.8.0-1049.52.1
- linux-nvidia-tegra Fixed in 6.8.0-1020.20
- linux-oem-6.11 No fix yet
- linux-oem-6.14 No fix yet
- linux-oem-6.17 Fixed in 6.17.0-1017.17
- linux-oem-6.8 No fix yet
- linux-oracle Fixed in 6.8.0-1047.48
- linux-oracle-6.14 No fix yet
- linux-oracle-6.17 Fixed in 6.17.0-1009.9~24.04.1
- linux-raspi Fixed in 6.8.0-1050.54
- linux-raspi-realtime No fix yet
- linux-realtime No fix yet
- linux-riscv No fix yet
3 further packages in Ubuntu 24.04 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 25.10
- linux Fixed in 6.17.0-19.19
- linux-aws Fixed in 6.17.0-1009.9
- linux-azure Fixed in 6.17.0-1010.10
- linux-azure-fde No fix yet
- linux-gcp Fixed in 6.17.0-1009.9
- linux-oracle Fixed in 6.17.0-1009.9
- linux-raspi Fixed in 6.17.0-1010.10
- linux-realtime Fixed in 6.17.0-1008.9
- linux-riscv Fixed in 6.17.0-19.19.1
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 5.15.0-1087.89
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Nvidia-BlueField 24.04 LTS
- linux-bluefield Fixed in 6.8.0-1017.21
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-aws-5.4 Fixed in 5.4.0-1156.166~18.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure-5.4 Fixed in 5.4.0-1161.167~18.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-gcp-5.4 Fixed in 5.4.0-1159.168~18.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-hwe-5.4 Fixed in 5.4.0-227.247~18.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-ibm-5.4 Fixed in 5.4.0-1102.107~18.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-oracle-5.4 Fixed in 5.4.0-1154.164~18.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-raspi-5.4 Fixed in 5.4.0-1139.152~18.04.1Available 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 20.04 LTS
- linux Fixed in 5.4.0-227.247Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-aws Fixed in 5.4.0-1156.166Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-aws-5.15 Fixed in 5.15.0-1103.110~20.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure Fixed in 5.4.0-1160.166Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure-5.15 Fixed in 5.15.0-1110.119~20.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-bluefield Fixed in 5.4.0-1116.123Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-gcp Fixed in 5.4.0-1159.168Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-gcp-5.15 Fixed in 5.15.0-1103.112~20.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-hwe-5.15 Fixed in 5.15.0-173.183~20.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-ibm Fixed in 5.4.0-1102.107Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-ibm-5.15 Fixed in 5.15.0-1097.100~20.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-intel-iotg-5.15 Fixed in 5.15.0-1098.104~20.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-iot Fixed in 5.4.0-1060.63Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-kvm Fixed in 5.4.0-1143.152Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-lowlatency-hwe-5.15 Fixed in 5.15.0-173.183~20.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-nvidia-tegra-5.15 Fixed in 5.15.0-1055.55~20.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-oracle Fixed in 5.4.0-1154.164Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-oracle-5.15 Fixed in 5.15.0-1100.106~20.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-raspi Fixed in 5.4.0-1139.152Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-riscv-5.15 Fixed in 5.15.0-1098.102~20.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-xilinx-zynqmp Fixed in 5.4.0-1074.78Available 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-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-updates 20.04 LTS
- linux-aws-fips Fixed in 5.4.0-1156.166+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 5.4.0-1160.166+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 5.4.0-1130.140Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 5.4.0-1159.168+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-updates 22.04 LTS
- linux-aws-fips Fixed in 5.15.0-1103.110+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 5.15.0-1109.118+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 5.15.0-173.183+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 5.15.0-1103.112+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-updates 24.04 LTS
- linux-aws-fips Fixed in 6.8.0-1050.53+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 6.8.0-1052.58+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 6.8.0-106.106+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 6.8.0-1052.55+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 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 5.15.0-1096.98Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-realtime Fixed in 5.15.0-1102.111Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-realtime-6.8 Fixed in 6.8.1-1045.46~22.04.1Available 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 Realtime 24.04 LTS
- linux-raspi-realtime Fixed in 6.8.0-2040.41Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-realtime Fixed in 6.8.1-1045.46Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-realtime-6.14 No fix yet
- linux-realtime-6.17 Fixed in 6.17.0-1008.9~24.04.1Available 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.