CVE-2026-43384
net/tcp-ao: Fix MAC comparison to be constant-time
02 Description
net/tcp-ao: Fix MAC comparison to be constant-time
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
- 0.45% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 39.3% of scored records. A rank, not a probability.
- NVD base score
- 9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/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
- 2026-05-08 14:21Z5 MO AGO
- Last updated
- 2026-08-05 12:27Z2 MO AGO
- Reserved
- 2026-05-01
- Assigning CNA
- Linux
- Record state
- PUBLISHED
- Severity
- Critical (CVSS 9.8)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-208Observable Timing DiscrepancyBase
- Data version
- 5.2
- Document digest
- 5d38cc2ae5c35d0f1c607e7bc362cc2c2598935ce7ca780716bbb1cf89ec1ddd
05 Affected products
06 References
- git.kernel.orghttps://git.kernel.org/stable/c/8be6ed64966da48b6c4726918f106c18742a5125
- git.kernel.orghttps://git.kernel.org/stable/c/a269cbdc442f8658bca35383e34b9d0b0ff95a1c
- git.kernel.orghttps://git.kernel.org/stable/c/080b0e210088296dd50d6637c06c1db14246adfe
- git.kernel.orghttps://git.kernel.org/stable/c/67edfec516d30d3e62925c397be4a1e5185802fc
07 Fixed in
Debian 13
- linux Fixed in 6.12.85-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- linux Fixed in 6.19.10-1
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-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-allwinner-5.19 No fix yet
- 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 6.8.0-1060.63~22.04.1
- 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 6.8.0-1063.71~22.04.1
- linux-azure-fde-5.19 No fix yet
- linux-azure-fde-6.2 No fix yet
- linux-azure-fde-6.8 Fixed in 6.8.0-1062.69~22.04.1
- 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 6.8.0-1063.69~22.04.1
- 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 6.8.0-136.136~22.04.1
- linux-ibm-6.8 Fixed in 6.8.0-1060.61~22.04.1
- linux-intel-iot-realtime No fix yet
- 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 6.8.0-134.134.1~22.04.1
- linux-nvidia-6.2 No fix yet
- linux-nvidia-6.5 No fix yet
- linux-nvidia-6.8 Fixed in 6.8.0-1058.61~22.04.1
- linux-oem-5.17 No fix yet
- linux-oem-6.0 No fix yet
- linux-oem-6.1 No fix yet
- linux-oem-6.5 No fix yet
- linux-oracle-6.5 No fix yet
- linux-oracle-6.8 Fixed in 6.8.0-1057.58~22.04.1
- linux-realtime No fix yet
- linux-riscv No fix yet
- linux-riscv-5.19 No fix yet
- linux-riscv-6.5 No fix yet
- linux-riscv-6.8 Fixed in 6.8.0-134.134~22.04.1
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 Fixed in 6.8.0-134.134
- linux-aws Fixed in 6.8.0-1060.63
- linux-aws-6.14 No fix yet
- linux-aws-6.17 Fixed in 6.17.0-1019.19~24.04.1
- linux-azure Fixed in 6.8.0-1063.71
- linux-azure-6.11 No fix yet
- linux-azure-6.14 No fix yet
- linux-azure-6.17 Fixed in 6.17.0-1021.21~24.04.1
- linux-azure-fde Fixed in 6.8.0-1062.69
- 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 6.8.0-1063.69
- linux-gcp-6.11 No fix yet
- linux-gcp-6.14 No fix yet
- linux-gcp-6.17 Fixed in 6.17.0-1020.22~24.04.1
- linux-gke Fixed in 6.8.0-1058.64
- linux-gkeop Fixed in 6.8.0-1045.48
- linux-hwe-6.11 No fix yet
- linux-hwe-6.14 No fix yet
- linux-hwe-6.17 Fixed in 6.17.0-40.40~24.04.1
- linux-ibm Fixed in 6.8.0-1060.61
- linux-lowlatency Fixed in 6.8.0-134.134.1
- linux-lowlatency-hwe-6.11 No fix yet
- linux-nvidia Fixed in 6.8.0-1058.61
- linux-nvidia-6.11 No fix yet
- linux-nvidia-6.17 Fixed in 6.17.0-1026.26
- linux-nvidia-lowlatency Fixed in 6.8.0-1058.61.1
- linux-nvidia-tegra Fixed in 6.8.0-1029.30
- linux-oem-6.11 No fix yet
- linux-oem-6.14 No fix yet
- linux-oem-6.17 Fixed in 6.17.0-1028.28
- linux-oem-6.8 No fix yet
- linux-oracle Fixed in 6.8.0-1057.58
- linux-oracle-6.14 No fix yet
- linux-oracle-6.17 Fixed in 6.17.0-1018.18~24.04.1
- linux-raspi Fixed in 6.8.0-1060.64
- 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 6.17.0-40.40
- linux-aws Fixed in 6.17.0-1019.19
- linux-azure No fix yet
- linux-azure-fde No fix yet
- linux-gcp Fixed in 6.17.0-1020.22
- linux-oracle Fixed in 6.17.0-1018.18
- linux-raspi Fixed in 6.17.0-1021.21
- linux-realtime Fixed in 6.17.0-1017.19
- linux-riscv Fixed in 6.17.0-40.40.1
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 6.8.0-1026.30
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 6.8.0-1060.63+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 6.8.0-1062.69+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 6.8.0-134.134+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 6.8.0-1063.69+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 Realtime 22.04 LTS
- linux-realtime-6.8 Fixed in 6.8.1-1055.56~22.04.1Available 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 6.8.0-2049.50Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-realtime Fixed in 6.8.1-1055.56Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-realtime-6.14 No fix yet
- linux-realtime-6.17 Fixed in 6.17.0-1017.19~24.04.1Available 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.