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Vulnerability record · CVE-2026-23408 · published 1 April 2026

CVE-2026-23408: Linux kernel double free vulnerability

Linux · Linux Kernel

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 ")

7.8 CVSS 3.1 High EPSS 0.18% · top 93.1% CWE-415 · Double free
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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 ")

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-23408), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.