7.8

CVE-2026-23408: linux Double Free

CVSS: 7.8v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-23408DEBIAN-CVE-2026-23408
Published 01-04-2026Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2026-23408 is a high (CVSS 7.8) Double Free vulnerability in linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.3% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 10 · Related 10
SUSE-SU-2026:21834-1SUSE-SU-2026:2195-1SUSE-SU-2026:2238-1USN-8152-1USN-8163-1USN-8163-2

Timeline

  1. 01-04-2026
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

0.00 pp

From 0.18% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu144 products
  • linux< 5.15.0-173.183 | < 6.8.0-106.106 | < 6.17.0-19.19
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1103.110 | < 6.8.0-1050.53 | < 6.17.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 145a0ef21c8e944957f58e2c8ffcd8a10f46266a, < c6347a2116ecccb8fd9ee4ebc75ae41d1d7ef689 | ≥ 145a0ef21c8e944957f58e2c8ffcd8a10f46266a, < c053ae381ce227577567d1ef10090ce7506d7a28 | ≥ 145a0ef21c8e944957f58e2c8ffcd8a10f46266a, < 35f4caec1352054b9a61cfdf2bf1898073637aa0 | ≥ 145a0ef21c8e944957f58e2c8ffcd8a10f46266a, < 55ef2af7490aaf72f8ffe11ec44c6bcb7eb2162a | ≥ 145a0ef21c8e944957f58e2c8ffcd8a10f46266a, < 86feeccd6b93ed94bd6655f30de80f163f8d5a45 | ≥ 145a0ef21c8e944957f58e2c8ffcd8a10f46266a, < 7998ab3010d2317643f91828f1853d954ef31387 | ≥ 145a0ef21c8e944957f58e2c8ffcd8a10f46266a, < 18b5233e860c294a847ee07869d93c0b8673a54b | ≥ 145a0ef21c8e944957f58e2c8ffcd8a10f46266a, < 5df0c44e8f5f619d3beb871207aded7c78414502 | 5.5
  • linux_kernel≥ 5.5.1, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.169 | ≥ 6.2, < 6.6.130 | ≥ 6.7, < 6.12.77 | ≥ 6.13, < 6.18.18 | ≥ 6.19, < 6.19.8 | 5.5 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linux< 6.1.164-1 | < 6.12.74-2 | < 6.19.6-2

3 vendors · 147 products

References

23 links
Show all 23 references