7.5

CVE-2026-23139: netfilter: nf_conncount: update last_gc only when GC has been performed

Modified
AliasesUBUNTU-CVE-2026-23139DEBIAN-CVE-2026-23139
Published 14-02-2026Last modified 05-08-2026

Vulnerability summary

CVE-2026-23139 is a high (CVSS 7.5) vulnerability in linux. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 32.4% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.38%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 28 · Related 25
MGASA-2026-0097MGASA-2026-0098OPENSUSE-SU-2026:20416-1RHSA-2026:15883SUSE-SU-2026:0962-1SUSE-SU-2026:1081-1

Timeline

  1. 14-02-2026
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conncount: update last_gc only when GC has been performed Currently last_gc is being updated everytime a new connection is tracked, that means that it is updated even if a GC wasn't performed. With a sufficiently high packet rate, it is possible to always bypass the GC, causing the list to grow infinitely. Update the last_gc value only when a GC has been actually performed.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.38%

Chance of exploitation in the next 30 days

Percentile

32%

Versus all other CVEs

30-day change

Increase +0.04 pp

From 0.35% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu130 products
  • linux< 6.8.0-117.117 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1055.58 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ f106694733c66a48740c25bc4e212e9b2ea364ce, < 2c7c71113ed6d3e2f3aca4c088f22283016ff34f | ≥ be69850b461e7b491d87a22e33ab76fdd04b725e, < c4cde57c8affdcca5bcff53a1047e15d268bdca1 | ≥ d265929930e2ffafc744c0ae05fb70acd53be1ee, < 9f45588993d7f115280fc726119ca86fba32a811 | ≥ d265929930e2ffafc744c0ae05fb70acd53be1ee, < 3cd717359e56f82f06cbf8279b47a7d79880c6f3 | ≥ d265929930e2ffafc744c0ae05fb70acd53be1ee, < 26a82dce2beee39c43c109d9647e16f49cb02a35 | ≥ d265929930e2ffafc744c0ae05fb70acd53be1ee, < 8bdafdf4900040a81422056cabe5e00a37bd101a | ≥ d265929930e2ffafc744c0ae05fb70acd53be1ee, < 7811ba452402d58628e68faedf38745b3d485e3c | 5.19
  • linux_kernel≥ 5.19, < 6.1.161 | ≥ 6.2, < 6.6.121 | ≥ 6.7, < 6.12.66 | ≥ 6.13, < 6.18.6 | 6.19:rc1 | 6.19:rc2 | 6.19:rc3 | 6.19:rc4
Debian1 product
  • linux< 6.1.162-1 | < 6.12.69-1 | < 6.18.8-1

3 vendors · 133 products

References

26 links
Show all 26 references