# CVE-2026-43384: linux: In the Linux kernel, the following vulnerability has been resolved:  net/tcp-ao: Fix MAC comparison to be constant-ti...

CVE-2026-43384 is fixed in 58 products on 1 platform, first by ALAS2023-2026-1594, released April 27, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-43384
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0046
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 27, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  net/tcp-ao: Fix MAC comparison to be constant-time  To prevent timing attacks, MACs need to be compared in constant time.  Use the appropriate helper function for this.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool6.12 amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | bpftool6.18 amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | bpftool6.18-debuginfo amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | dtb-aarch64 opensuse-leap 16.0 | 6.12.0-160000.36.1 | [OPENSUSE-SU-2026:21388-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21388-1.md) | Jul 21, 2026 |
| Linux | kernel-64kb opensuse-leap 16.0 | 6.12.0-160000.36.1 | [OPENSUSE-SU-2026:21388-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21388-1.md) | Jul 21, 2026 |
| Linux | kernel-64kb sles 16.0 | 6.12.0-160000.36.1 | [SUSE-SU-2026:22835-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22835-1.md) | Jul 21, 2026 |
| Linux | kernel-azure opensuse-leap 16.0 | 6.12.0-160000.36.1 | [OPENSUSE-SU-2026:21388-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21388-1.md) | Jul 21, 2026 |
| Linux | kernel-azure sles 16.0 | 6.12.0-160000.36.1 | [SUSE-SU-2026:22835-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22835-1.md) | Jul 21, 2026 |
| Linux | kernel-default opensuse-leap 16.0 | 6.12.0-160000.36.1 | [OPENSUSE-SU-2026:21388-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21388-1.md) | Jul 21, 2026 |
| Linux | kernel-default sles 16.0 | 6.12.0-160000.36.1 | [SUSE-SU-2026:22835-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22835-1.md) | Jul 21, 2026 |
| Linux | kernel-default-base opensuse-leap 16.0 | 6.12.0-160000.36.1.160000.2.17 | [OPENSUSE-SU-2026:21388-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21388-1.md) | Jul 21, 2026 |
| Linux | kernel-default-base sles 16.0 | 6.12.0-160000.36.1.160000.2.17 | [SUSE-SU-2026:22835-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22835-1.md) | Jul 21, 2026 |
| Linux | kernel-docs opensuse-leap 16.0 | 6.12.0-160000.36.1 | [OPENSUSE-SU-2026:21388-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21388-1.md) | Jul 21, 2026 |
| Linux | kernel-docs sles 16.0 | 6.12.0-160000.36.1 | [SUSE-SU-2026:22835-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22835-1.md) | Jul 21, 2026 |
| Linux | kernel-kvmsmall opensuse-leap 16.0 | 6.12.0-160000.36.1 | [OPENSUSE-SU-2026:21388-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21388-1.md) | Jul 21, 2026 |
| Linux | kernel-kvmsmall sles 16.0 | 6.12.0-160000.36.1 | [SUSE-SU-2026:22835-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22835-1.md) | Jul 21, 2026 |
| Linux | kernel-livepatch-6.12.79-101.147 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel-livepatch-6.18.20-20.229 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | kernel-obs-build opensuse-leap 16.0 | 6.12.0-160000.36.1 | [OPENSUSE-SU-2026:21388-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21388-1.md) | Jul 21, 2026 |
| Linux | kernel-obs-qa opensuse-leap 16.0 | 6.12.0-160000.36.1 | [OPENSUSE-SU-2026:21388-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21388-1.md) | Jul 21, 2026 |
| Linux | kernel-obs-qa sles 16.0 | 6.12.0-160000.36.1 | [SUSE-SU-2026:22835-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22835-1.md) | Jul 21, 2026 |
| Linux | kernel-rt opensuse-leap 16.0 | 6.12.0-160000.36.1 | [OPENSUSE-SU-2026:21388-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21388-1.md) | Jul 21, 2026 |
| Linux | kernel-source opensuse-leap 16.0 | 6.12.0-160000.36.1 | [OPENSUSE-SU-2026:21388-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21388-1.md) | Jul 21, 2026 |
| Linux | kernel-source sles 16.0 | 6.12.0-160000.36.1 | [SUSE-SU-2026:22835-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22835-1.md) | Jul 21, 2026 |
| Linux | kernel-syms opensuse-leap 16.0 | 6.12.0-160000.36.1 | [OPENSUSE-SU-2026:21388-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21388-1.md) | Jul 21, 2026 |
| Linux | kernel-syms sles 16.0 | 6.12.0-160000.36.1 | [SUSE-SU-2026:22835-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22835-1.md) | Jul 21, 2026 |
| Linux | kernel-zfcpdump opensuse-leap 16.0 | 6.12.0-160000.36.1 | [OPENSUSE-SU-2026:21388-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21388-1.md) | Jul 21, 2026 |
| Linux | kernel-zfcpdump sles 16.0 | 6.12.0-160000.36.1 | [SUSE-SU-2026:22835-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22835-1.md) | Jul 21, 2026 |
| Linux | kernel6.12 amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel6.12-devel amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel6.12-headers amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel6.12-libbpf amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel6.12-libbpf-debuginfo amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel6.12-libbpf-devel amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel6.12-libbpf-static amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel6.12-tools amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | kernel6.18 amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | kernel6.18-debuginfo amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | kernel6.18-debuginfo-common-aarch64 amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | kernel6.18-debuginfo-common-x86_64 amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | kernel6.18-devel amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | kernel6.18-headers amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | kernel6.18-libbpf amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | kernel6.18-libbpf-debuginfo amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | kernel6.18-libbpf-devel amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | kernel6.18-libbpf-static amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | kernel6.18-modules-extra amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | kernel6.18-modules-extra-common amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | kernel6.18-tools amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | kernel6.18-tools-debuginfo amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | kernel6.18-tools-devel amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.85-1 | [DEBIAN-CVE-2026-43384](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43384.md) | May 15, 2026 |
| Linux | linux Debian 14 | 6.19.10-1 | [DEBIAN-CVE-2026-43384](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43384.md) | May 15, 2026 |
| Linux | perf6.12 amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | perf6.18 amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | perf6.18-debuginfo amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | python3-perf6.12 amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.79-101.147.amzn2023 | [ALAS2023-2026-1594](https://patchblox.com/security/data/fix/linux/alas2023-2026-1594.md) | Apr 27, 2026 |
| Linux | python3-perf6.18 amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |
| Linux | python3-perf6.18-debuginfo amzn 2023 | 1:6.18.20-20.229.amzn2023 | [ALAS2023-2026-1596](https://patchblox.com/security/data/fix/linux/alas2023-2026-1596.md) | Apr 27, 2026 |

---

Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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