# CVE-2026-23408: apparmor: Fix double free of ns\_name in aa\_replace\_profiles()

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2026-04-01 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 5.5

## Description

In the Linux kernel, the following vulnerability has been resolved: apparmor: Fix double free of ns_name in aa_replace_profiles() if ns_name is NULL after 1071 error = aa_unpack(udata, &lh, &ns_name); and if ent->ns_name contains an ns_name in 1089 } else if (ent->ns_name) { then ns_name is assigned the ent->ns_name 1095 ns_name = ent->ns_name; however ent->ns_name is freed at 1262 aa_load_ent_free(ent); and then again when freeing ns_name at 1270 kfree(ns_name); Fix this by NULLing out ent->ns_name after it is transferred to ns_name ")

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
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## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c6347a2116ecccb8fd9ee4ebc75ae41d1d7ef689
- https://git.kernel.org/stable/c/c053ae381ce227577567d1ef10090ce7506d7a28
- https://git.kernel.org/stable/c/35f4caec1352054b9a61cfdf2bf1898073637aa0
- https://git.kernel.org/stable/c/55ef2af7490aaf72f8ffe11ec44c6bcb7eb2162a
- https://git.kernel.org/stable/c/86feeccd6b93ed94bd6655f30de80f163f8d5a45
- https://git.kernel.org/stable/c/7998ab3010d2317643f91828f1853d954ef31387
- https://git.kernel.org/stable/c/18b5233e860c294a847ee07869d93c0b8673a54b
- https://git.kernel.org/stable/c/5df0c44e8f5f619d3beb871207aded7c78414502

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