7.8

CVE-2026-23391: linux Use After Free

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2026-23391DEBIAN-CVE-2026-23391
Published 25-03-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-23391 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.2% 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
0.13%
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 32 · Related 29
LSN-0122-1MGASA-2026-0097MGASA-2026-0098SUSE-SU-2026:21834-1SUSE-SU-2026:2238-1USN-8567-1

Timeline

  1. 25-03-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_CT: drop pending enqueued packets on template removal Templates refer to objects that can go away while packets are sitting in nfqueue refer to: - helper, this can be an issue on module removal. - timeout policy, nfnetlink_cttimeout might remove it. The use of templates with zone and event cache filter are safe, since this just copies values. Flush these enqueued packets in case the template rule gets removed.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.13%

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

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 24de58f465165298aaa8f286b2592f0163706cfe, < 55445134d42b84cb0a272e42c98d233ca65eca83 | ≥ 24de58f465165298aaa8f286b2592f0163706cfe, < cc57506dd66555899560b9c0f24e813f034e12ec | ≥ 24de58f465165298aaa8f286b2592f0163706cfe, < d2d0bae0c9a2a17b6990a2966f5cdce0813d6256 | ≥ 24de58f465165298aaa8f286b2592f0163706cfe, < 63b8097cea1923fe82cd598068d0796da8c015ec | ≥ 24de58f465165298aaa8f286b2592f0163706cfe, < 19a230dec6bb8928e3f96387f9085cf2c79bcef9 | ≥ 24de58f465165298aaa8f286b2592f0163706cfe, < cb549925875fa06dd155e49db4ac2c5044c30f9c | ≥ 24de58f465165298aaa8f286b2592f0163706cfe, < 777d02efe3d630cca4c1b63962cec17c57711325 | ≥ 24de58f465165298aaa8f286b2592f0163706cfe, < f62a218a946b19bb59abdd5361da85fa4606b96b | 3.4
  • linux_kernel≥ 3.4.1, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.167 | ≥ 6.2, < 6.6.130 | ≥ 6.7, < 6.12.78 | ≥ 6.13, < 6.18.20 | ≥ 6.19, < 6.19.10 | 3.4 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.10-1

3 vendors · 160 products

References

44 links
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