8.3

CVE-2026-52920: netfilter: xt_policy: fix strict mode inbound policy matching

Modified
AliasesUBUNTU-CVE-2026-52920DEBIAN-CVE-2026-52920
Published 24-06-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-52920 is a high (CVSS 8.3) Incorrect Calculation vulnerability in linux. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 22.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.3/10
010
High · v3.1 (CVE.org)
EPSS score
0.30%
0%100%
Low · 0.00 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 52 · Related 49
OPENSUSE-SU-2026:21910-1RHSA-2026:59723RHSA-2026:68531RHSA-2026:68532SUSE-SU-2026:23477-1SUSE-SU-2026:23481-1

Timeline

  1. 24-06-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_policy: fix strict mode inbound policy matching match_policy_in() walks sec_path entries from the last transform to the first one, but strict policy matching needs to consume info->pol[] in the same forward order as the rule layout. Derive the strict-match policy position from the number of transforms already consumed so that multi-element inbound rules are matched consistently.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.30%

Chance of exploitation in the next 30 days

Percentile

23%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.30% 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

Affected systems

Version check

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

Ubuntu166 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136 | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64 | < 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ c4b885139203d37f76662c37ae645fe8e0f4e4e5, < eb323f7b82d2e2f638de0cc2a177803eb20e0707 | ≥ c4b885139203d37f76662c37ae645fe8e0f4e4e5, < fc1c518bb1f054831ecabb32da9b8e1dff9699c6 | ≥ c4b885139203d37f76662c37ae645fe8e0f4e4e5, < f98b7f85e04b40e28b08c461ded0cc79f14f5509 | ≥ c4b885139203d37f76662c37ae645fe8e0f4e4e5, < 82664d0f1ba25e4f9a71994954abae24c60f4067 | ≥ c4b885139203d37f76662c37ae645fe8e0f4e4e5, < b130a6eefa02bd4d475f2f059da8bcfb3e7d18d9 | ≥ c4b885139203d37f76662c37ae645fe8e0f4e4e5, < 938867e870fb5471bb16f442aeac81326e05bf65 | ≥ c4b885139203d37f76662c37ae645fe8e0f4e4e5, < 392cc1d8408b5665215c1e9290bbf0f92339b043 | ≥ c4b885139203d37f76662c37ae645fe8e0f4e4e5, < 4b2b4d7d4e203c92db8966b163edfacb1f0e1e29 | 2.6.17
  • linux_kernel≥ 2.6.17, < 5.10.258 | ≥ 5.11, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.141 | ≥ 6.7, < 6.12.91 | ≥ 6.13, < 6.18.33 | ≥ 6.19, < 7.0.10 | 7.1:rc1
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.10-1

3 vendors · 169 products

References

50 links
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