CyberSecBulletin
CVE-2026-64000NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-64000 is a critical-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 09a37dca090c55ffb1a33f52d8667f1c2367ef48, a4b64f3e9c7b8259f7dd251a0313420ba7c01852, 71c986c0ba45b7dc574fae27c83e7b6671556f37 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.49% chance of exploitation within 30 days, which is low compared with other CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Update Linux to 09a37dca090c55ffb1a33f52d8667f1c2367ef48 or a4b64f3e9c7b8259f7dd251a0313420ba7c01852 or 71c986c0ba45b7dc574fae27c83e7b6671556f37 or fbd0662f9c9a66e8cc3df3099cca8ed6d3837cc7, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 6.1.176 or 6.6.143 or 6.12.93 or 6.18.35, whichever matches your release line, or a later version.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxeafaa88b3eb7f28aecb222281655473431d3ef2e up to, but not including, 09a37dca090c55ffb1a33f52d8667f1c2367ef48; eafaa88b3eb7f28aecb222281655473431d3ef2e up to, but not including, a4b64f3e9c7b8259f7dd251a0313420ba7c01852; eafaa88b3eb7f28aecb222281655473431d3ef2e up to, but not including, 71c986c0ba45b7dc574fae27c83e7b6671556f37; eafaa88b3eb7f28aecb222281655473431d3ef2e up to, but not including, fbd0662f9c9a66e8cc3df3099cca8ed6d3837cc7; eafaa88b3eb7f28aecb222281655473431d3ef2e up to, but not including, 78607a6854a22a2502f68092202e75a39af4865d; eafaa88b3eb7f28aecb222281655473431d3ef2e up to, but not including, f229426072fc865654a60978bb7fda790a051ff3; 5.1609a37dca090c55ffb1a33f52d8667f1c2367ef48, a4b64f3e9c7b8259f7dd251a0313420ba7c01852, 71c986c0ba45b7dc574fae27c83e7b6671556f37, fbd0662f9c9a66e8cc3df3099cca8ed6d3837cc7, 78607a6854a22a2502f68092202e75a39af4865d, f229426072fc865654a60978bb7fda790a051ff3
LinuxLinux Kernel5.16 up to, but not including, 6.1.176; 6.2 up to, but not including, 6.6.143; 6.7 up to, but not including, 6.12.93; 6.13 up to, but not including, 6.18.35; 6.19 up to, but not including, 7.0.12; 7.16.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA.

Official 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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

How developers prevent this class of flaw

  • Use a language that provides appropriate memory abstractions.

More Out-of-bounds Read vulnerabilities (CWE-125)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

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