Vulnerability in Linux

CVE-2026-64009

In the Linux kernel, the following vulnerability has been resolved: xfrm: Check for underflow in xfrm_state_mtu Leo Lin reported OOB write issue in esp component: xfrm_state_mtu() returns u32 but performs its arithmetic in unsigned …

EPSS: 0.002 (11.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

  • Linux — versions c5c2523893747f88a83376abad310c8ad13f7197, 2.6.22, 0

References

Frequently asked questions

What is CVE-2026-64009?
CVE-2026-64009 is a high-severity vulnerability in Linux. CVSS score: 7.8/10. Published 2026-07-19.
How severe is CVE-2026-64009?
High severity. CVSS v3 base score is 7.8 out of 10.