Review reviewCritical

CVE-2026-64000

Linux

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.

CVSS
9.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 9.8

Vulnerability overview

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.

Affected product and versions

Product
Linux
Affected versions
>= eafaa88b3eb7f28aecb222281655473431d3ef2e < 09a37dca090c55ffb1a33f52d8667f1c2367ef48, >= eafaa88b3eb7f28aecb222281655473431d3ef2e < a4b64f3e9c7b8259f7dd251a0313420ba7c01852, >= eafaa88b3eb7f28aecb222281655473431d3ef2e < 71c986c0ba45b7dc574fae27c83e7b6671556f37, >= eafaa88b3eb7f28aecb222281655473431d3ef2e < fbd0662f9c9a66e8cc3df3099cca8ed6d3837cc7, >= eafaa88b3eb7f28aecb222281655473431d3ef2e < 78607a6854a22a2502f68092202e75a39af4865d, >= eafaa88b3eb7f28aecb222281655473431d3ef2e < f229426072fc865654a60978bb7fda790a051ff3, >= 5.16
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available