# CVE-2026-43088: net: af_key: zero aligned sockaddr tail in PF_KEY exports

CVE-2026-43088 is fixed in 66 products on 1 platform, first by DEBIAN-CVE-2026-43088, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-43088
- Priority: High
- CVSS: 7.1 (Moderate)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 6, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43088

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: af_key: zero aligned sockaddr tail in PF_KEY exports  PF_KEY export paths use `pfkey_sockaddr_size()` when reserving sockaddr payload space, so IPv6 addresses occupy 32 bytes on the wire. However, `pfkey_sockaddr_fill()` initializes only the first 28 bytes of `struct sockaddr_in6`, leaving the final 4 aligned bytes uninitialized.  Not every PF_KEY message is affected. The state and policy dump builders already zero the whole message buffer before filling the sockaddr payloads. Keep the fix to the export paths that still append aligned sockaddr payloads with plain `skb_put()`:    - `SADB_ACQUIRE`   - `SADB_X_NAT_T_NEW_MAPPING`   - `SADB_X_MIGRATE`  Fix those paths by clearing only the aligned sockaddr tail after `pfkey_sockaddr_fill()`.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | bpftool ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | bpftool6.12 amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | bpftool6.18 amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | bpftool6.18-debuginfo amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel-64kb sles 15.7 | 6.4.0-150700.53.55.1 | [SUSE-SU-2026:2238-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2238-1.md) | Jun 30, 2026 |
| Linux | kernel-azure sles 15.7 | 6.4.0-150700.53.55.1 | [SUSE-SU-2026:2238-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2238-1.md) | Jun 30, 2026 |
| Linux | kernel-default sles 15.7 | 6.4.0-150700.53.55.1 | [SUSE-SU-2026:2238-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2238-1.md) | Jun 30, 2026 |
| Linux | kernel-default-base sles 15.7 | 6.4.0-150700.53.55.1.150700.17.33.1 | [SUSE-SU-2026:2238-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2238-1.md) | Jun 30, 2026 |
| Linux | kernel-docs sles 15.7 | 6.4.0-150700.53.55.1 | [SUSE-SU-2026:2238-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2238-1.md) | Jun 30, 2026 |
| Linux | kernel-livepatch-6.12.90-120.164 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | kernel-livepatch-6.18.30-61.116 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel-livepatch-SLE15-SP7_Update_15 sles 15.7 | 1-150700.15.3.1 | [SUSE-SU-2026:2238-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2238-1.md) | Jun 30, 2026 |
| Linux | kernel-obs-build sles 15.7 | 6.4.0-150700.53.55.1 | [SUSE-SU-2026:2238-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2238-1.md) | Jun 30, 2026 |
| Linux | kernel-source sles 15.7 | 6.4.0-150700.53.55.1 | [SUSE-SU-2026:2238-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2238-1.md) | Jun 30, 2026 |
| Linux | kernel-syms sles 15.7 | 6.4.0-150700.53.55.1 | [SUSE-SU-2026:2238-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2238-1.md) | Jun 30, 2026 |
| Linux | kernel-uek ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-container ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-container ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-container-debug ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-container-debug ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-core ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-core ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-debug ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-debug ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-debug-core ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-debug-core ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-debug-devel ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-debug-devel ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-debug-modules ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-debug-modules ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-debug-modules-extra ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-debug-modules-extra ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-devel ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-devel ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-doc ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-doc ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-modules ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-modules ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-modules-extra ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek-modules-extra ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek64k ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek64k ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek64k-core ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek64k-core ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek64k-devel ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek64k-devel ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek64k-modules ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek64k-modules ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek64k-modules-extra ol 8 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-uek64k-modules-extra ol 9 | 0:5.15.0-324.217.5.3.el9uek | [ELSA-2026-500329](https://patchblox.com/security/data/fix/linux/elsa-2026-500329.md) | Sep 17, 2026 |
| Linux | kernel-zfcpdump sles 15.7 | 6.4.0-150700.53.55.1 | [SUSE-SU-2026:2238-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2238-1.md) | Jun 30, 2026 |
| Linux | kernel6.12 amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | kernel6.12-devel amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | kernel6.12-headers amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | kernel6.12-tools amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | kernel6.18 amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-debuginfo amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-debuginfo-common-aarch64 amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-debuginfo-common-x86_64 amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-devel amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-headers amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-modules-extra amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-modules-extra-common amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-tools amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-tools-debuginfo amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | kernel6.18-tools-devel amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | linux Debian 12.15 (bookworm) | 6.1.190-1 | [DEBIAN-CVE-2026-43088](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43088.md) | May 15, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.88-1 | [DEBIAN-CVE-2026-43088](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43088.md) | May 15, 2026 |
| Linux | linux Debian 14 | 6.19.14-1 | [DEBIAN-CVE-2026-43088](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43088.md) | May 15, 2026 |
| Linux | perf6.12 amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | perf6.18 amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | perf6.18-debuginfo amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | python3-perf6.12 amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.90-120.164.amzn2023 | [ALAS2023-2026-1816](https://patchblox.com/security/data/fix/linux/alas2023-2026-1816.md) | Jun 8, 2026 |
| Linux | python3-perf6.18 amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |
| Linux | python3-perf6.18-debuginfo amzn 2023 | 1:6.18.30-61.116.amzn2023 | [ALAS2023-2026-1754](https://patchblox.com/security/data/fix/linux/alas2023-2026-1754.md) | May 25, 2026 |

---

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