# CVE-2026-23403: apparmor: fix memory leak in verify_header

CVE-2026-23403 is fixed in 12 products on 1 platform, first by DEBIAN-CVE-2026-23403, released April 1, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-23403
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 1, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23403

## Description

In the Linux kernel, the following vulnerability has been resolved:  apparmor: fix memory leak in verify_header  The function sets `*ns = NULL` on every call, leaking the namespace string allocated in previous iterations when multiple profiles are unpacked. This also breaks namespace consistency checking since *ns is always NULL when the comparison is made.  Remove the incorrect assignment. The caller (aa_unpack) initializes *ns to NULL once before the loop, which is sufficient.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| 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 15.6 | 6.4.0-150600.23.112.1 | [SUSE-SU-2026:2195-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2195-1.md) | Jul 1, 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 15.6 | 6.4.0-150600.23.112.1.150600.12.52.1 | [SUSE-SU-2026:2195-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2195-1.md) | Jul 1, 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 15.6 | 6.4.0-150600.23.112.1 | [SUSE-SU-2026:2195-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2195-1.md) | Jul 1, 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-SLE15-SP6_Update_26 sles 15.6 | 1-150600.13.3.1 | [SUSE-SU-2026:2195-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2195-1.md) | Jul 1, 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 15.6 | 6.4.0-150600.23.112.1 | [SUSE-SU-2026:2195-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2195-1.md) | Jul 1, 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 15.6 | 6.4.0-150600.23.112.1 | [SUSE-SU-2026:2195-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2195-1.md) | Jul 1, 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 15.6 | 6.4.0-150600.23.112.1 | [SUSE-SU-2026:2195-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2195-1.md) | Jul 1, 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-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 | linux Debian 12.15 (bookworm) | 6.1.164-1 | [DEBIAN-CVE-2026-23403](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23403.md) | Apr 1, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.74-2 | [DEBIAN-CVE-2026-23403](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23403.md) | Apr 1, 2026 |
| Linux | linux Debian 14 | 6.19.6-2 | [DEBIAN-CVE-2026-23403](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23403.md) | Apr 1, 2026 |

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Data as of 2026-11-08T06:59:42Z 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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