CyberSecBulletin
CVE-2026-64225NVD status: Analyzed

Linux: Improper Validation of Array Index

Published Updated By the CyberSecBulletin desk

CVE-2026-64225 is a high-severity improper validation of array index vulnerability in Linux, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 94071141f00bc414e8f8f7f5db3b5143d535299f, 985b5e38ac4f4d5ff03c8bfd8484353b440a1579, 93d3dc81098cd60fb74d434ba7985ddfd9de5acb 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 0.13% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to 94071141f00bc414e8f8f7f5db3b5143d535299f or 985b5e38ac4f4d5ff03c8bfd8484353b440a1579 or 93d3dc81098cd60fb74d434ba7985ddfd9de5acb or e043017ac429caee73bd30c5a725659f1a3a4568, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.259 or 5.15.210 or 6.1.176 or 6.6.143, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux61071a871ea6eb2125ece91c1a0dbb124a318c8a up to, but not including, 94071141f00bc414e8f8f7f5db3b5143d535299f; 61071a871ea6eb2125ece91c1a0dbb124a318c8a up to, but not including, 985b5e38ac4f4d5ff03c8bfd8484353b440a1579; 61071a871ea6eb2125ece91c1a0dbb124a318c8a up to, but not including, 93d3dc81098cd60fb74d434ba7985ddfd9de5acb; 61071a871ea6eb2125ece91c1a0dbb124a318c8a up to, but not including, e043017ac429caee73bd30c5a725659f1a3a4568; 61071a871ea6eb2125ece91c1a0dbb124a318c8a up to, but not including, 8201bf45cc7c1c1a09290c4db8ab1e19801f8fec; 61071a871ea6eb2125ece91c1a0dbb124a318c8a up to, but not including, 47a4cf2229be379cf88f92e32e1240337cd6273f; 61071a871ea6eb2125ece91c1a0dbb124a318c8a up to, but not including, 2c3d26b4a62454945ba9ef3af3174d3e40e7afef; 61071a871ea6eb2125ece91c1a0dbb124a318c8a up to, but not including, c0bf0a4f3f1f5f57aa83e1400ba4f56f0abfd542; and 1 more ranges94071141f00bc414e8f8f7f5db3b5143d535299f, 985b5e38ac4f4d5ff03c8bfd8484353b440a1579, 93d3dc81098cd60fb74d434ba7985ddfd9de5acb, e043017ac429caee73bd30c5a725659f1a3a4568, 8201bf45cc7c1c1a09290c4db8ab1e19801f8fec, 47a4cf2229be379cf88f92e32e1240337cd6273f
LinuxLinux Kernel4.20 up to, but not including, 5.10.259; 5.11 up to, but not including, 5.15.210; 5.16 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, 6.12.92; 6.13 up to, but not including, 6.18.34; 6.19 up to, but not including, 7.0.11; 7.15.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.92, 6.18.34

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
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Official description

In the Linux kernel, the following vulnerability has been resolved: octeontx2-af: CGX: add bounds check to cgx_speed_mbps index cgx_speed_mbps has 13 elements but RESP_LINKSTAT_SPEED can yield values 0-15. If it returns a value >= 13, this causes an out-of-bounds array access. Add a bounds check and default to speed 0 if the index is out of range.

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

The underlying weakness: Improper Validation of Array Index

The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array.

How developers prevent this class of flaw

  • Use an input validation framework such as Struts or the OWASP ESAPI Validation API. Note that using a framework does not automatically address all input validation problems; be mindful of weaknesses that could arise from misusing the framework itself (CWE-1173).
  • Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, Ada allows the programmer to constrain the values of a variable and languages such as Java and Ruby will allow the programmer to handle exceptions when an out-of-bounds index is accessed.
  • Use a CPU and operating system that offers Data Execution Protection (using hardware NX or XD bits) or the equivalent techniques that simulate this feature in software, such as PaX. These techniques ensure that any instruction executed is exclusively at a memory address that is part of the code segment. For more information on these techniques see D3-PSEP (Process Segment Execution Prevention) from D3FEND.

More Improper Validation of Array Index vulnerabilities (CWE-129)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Improper Validation of Array Index vulnerabilities

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