CVE-2026-52920 (CVSS 8.3)

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.

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CVSS v3.1 Score

8.3

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

EPSS — Exploit Prediction

0.0030

Probability of exploitation

0.22%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/392cc1d8408b5665215c1e9290bbf0f92339b043 https://git.kernel.org/stable/c/4b2b4d7d4e203c92db8966b163edfacb1f0e1e29 https://git.kernel.org/stable/c/82664d0f1ba25e4f9a71994954abae24c60f4067 https://git.kernel.org/stable/c/938867e870fb5471bb16f442aeac81326e05bf65 https://git.kernel.org/stable/c/b130a6eefa02bd4d475f2f059da8bcfb3e7d18d9 https://git.kernel.org/stable/c/eb323f7b82d2e2f638de0cc2a177803eb20e0707 https://git.kernel.org/stable/c/f98b7f85e04b40e28b08c461ded0cc79f14f5509 https://git.kernel.org/stable/c/fc1c518bb1f054831ecabb32da9b8e1dff9699c6

Frequently Asked Questions

What is CVE-2026-52920? +

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. It has a CVSS v3.1 base score of 8.3 (HIGH).

How severe is CVE-2026-52920? +

CVE-2026-52920 has a CVSS v3.1 score of 8.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0030, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-52920? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-52920