CVE-2026-64000 (CVSS 9.8)

Description

In the Linux kernel, the following vulnerability has been resolved: net: hsr: fix potential OOB access in supervision frame handling Ensure the entire TLV header is linearized before access by adding sizeof(struct hsr_sup_tlv) to the pskb_may_pull() calls. Without this, a truncated frame could cause an out-of-bounds access.

Is your site exposed to CVE-2026-64000?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

9.8

CRITICAL

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

EPSS — Exploit Prediction

0.0049

Probability of exploitation

0.40%

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/09a37dca090c55ffb1a33f52d8667f1c2367ef48 https://git.kernel.org/stable/c/71c986c0ba45b7dc574fae27c83e7b6671556f37 https://git.kernel.org/stable/c/78607a6854a22a2502f68092202e75a39af4865d https://git.kernel.org/stable/c/a4b64f3e9c7b8259f7dd251a0313420ba7c01852 https://git.kernel.org/stable/c/f229426072fc865654a60978bb7fda790a051ff3 https://git.kernel.org/stable/c/fbd0662f9c9a66e8cc3df3099cca8ed6d3837cc7

Frequently Asked Questions

What is CVE-2026-64000? +

In the Linux kernel, the following vulnerability has been resolved: net: hsr: fix potential OOB access in supervision frame handling Ensure the entire TLV header is linearized before access by adding sizeof(struct hsr_sup_tlv) to the pskb_may_pull() calls. Without this, a truncated frame could cause an out-of-bounds access. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-64000? +

CVE-2026-64000 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0049, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-64000? +

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-2026-64000