Is CVE-2026-31674 in the CISA KEV catalog?

No. CVE-2026-31674 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-31674?

CVE-2026-31674 has a CVSS v3 base score of 7.1 (Important).

What is the EPSS score for CVE-2026-31674?

CVE-2026-31674 has an EPSS score of 0.12% (2th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-31674?

Upgrade linux on debian 11 to 5.10.257-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-31674

HIGH

7.1

CVSS v3

NVD

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check() Reject rt match rules whose addrnr exceeds IP6T_RT_HOPS. rt_mt6() expects addrnr to stay within the bounds of rtinfo->addrs[]. Validate addrnr during rule installation so malformed rules are rejected before the match logic can use an out-of-range value.

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.257-1CVE-2026-31674

Fixed in:6.1.170-1CVE-2026-31674

Fixed in:6.12.85-1CVE-2026-31674

Fixed in:6.19.11-1CVE-2026-31674

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.12%probability of exploitation in 30 days

2ndpercentile

Low risk: more likely to be exploited than 2% of all known CVEs.

References

Patch8

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.