5.5

CVE-2026-23404: linux

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-23404DEBIAN-CVE-2026-23404
Published 01-04-2026Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2026-23404 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.8% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
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 13 · Related 15
SUSE-SU-2026:21834-1SUSE-SU-2026:2195-1SUSE-SU-2026:2238-1USN-8098-10USN-8152-1USN-8163-1

Timeline

  1. 01-04-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: apparmor: replace recursive profile removal with iterative approach The profile removal code uses recursion when removing nested profiles, which can lead to kernel stack exhaustion and system crashes. Reproducer: $ pf='a'; for ((i=0; i<1024; i++)); do echo -e "profile $pf { \n }" | apparmor_parser -K -a; pf="$pf//x"; done $ echo -n a > /sys/kernel/security/apparmor/.remove Replace the recursive __aa_profile_list_release() approach with an iterative approach in __remove_profile(). The function repeatedly finds and removes leaf profiles until the entire subtree is removed, maintaining the same removal semantic without recursion.

CVSS metrics

3 scores · 3 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

No weakness data has been published for this record.

Affected systems

Ubuntu156 products
  • linuxAll versions (No fix recorded) | < 4.15.0-249.261 | < 5.4.0-227.247 | < 5.15.0-173.183 | < 6.8.0-106.106 | < 6.17.0-19.19
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 4.15.0-1191.204 | < 5.4.0-1156.166 | < 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≥ c88d4c7b049e87998ac0a9f455aa545cc895ef92, < ea854f032190cc9f26dc4a0e727090c89e55e342 | ≥ c88d4c7b049e87998ac0a9f455aa545cc895ef92, < 4fdc847b107321dec22bf8ecd6019b7af76d7886 | ≥ c88d4c7b049e87998ac0a9f455aa545cc895ef92, < b36a04284d0208be94e5e401409caa00e2bf1be1 | ≥ c88d4c7b049e87998ac0a9f455aa545cc895ef92, < 33959a491e9fd557abfa5fce5ae4637d400915d3 | ≥ c88d4c7b049e87998ac0a9f455aa545cc895ef92, < 999bd704b0b641527a5ed46f0d969deff8cfa68b | ≥ c88d4c7b049e87998ac0a9f455aa545cc895ef92, < 7eade846e013cbe8d2dc4a484463aa19e6515c7f | ≥ c88d4c7b049e87998ac0a9f455aa545cc895ef92, < a6a941a1294ac5abe22053dc501d25aed96e48fe | ≥ c88d4c7b049e87998ac0a9f455aa545cc895ef92, < ab09264660f9de5d05d1ef4e225aa447c63a8747 | 2.6.36
  • linux_kernel≥ 2.6.36.1, < 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 | 2.6.36 | 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 · 159 products

References

28 links
Show all 28 references