CyberSecBulletin
CVE-2026-64413NVD status: Modified

Linux: Use of Uninitialized Resource

Published Updated By the CyberSecBulletin desk

CVE-2026-64413 is a high-severity use of uninitialized resource vulnerability in Linux, with a CVSS 3.1 base score of 7.0 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 2ade612967e2cdfb9290ebcb773f302c82f311fa, 42bef500d07b5769d916e9122a3e3fa3fd2245ef, fc7f105451044501a50cfd530cfa3b472c54acbc 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 2ade612967e2cdfb9290ebcb773f302c82f311fa or 42bef500d07b5769d916e9122a3e3fa3fd2245ef or fc7f105451044501a50cfd530cfa3b472c54acbc or 9e6c5169db423e51dcc66a73fd15409c0d38e088, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.261 or 5.15.212 or 6.1.178 or 6.6.145, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 2ade612967e2cdfb9290ebcb773f302c82f311fa; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 42bef500d07b5769d916e9122a3e3fa3fd2245ef; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, fc7f105451044501a50cfd530cfa3b472c54acbc; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 9e6c5169db423e51dcc66a73fd15409c0d38e088; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 29bf41a9b59aff9f6197df58641a00037d567ca8; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 9f74d28e903fa4fdf82f870d0aeadddc8196e41c; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 5ee856e4208acafaaaf7b84824d39b78c21345d6; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, cbfe53599eebffd188938ab6774cc41794f6f9d5; and 1 more ranges2ade612967e2cdfb9290ebcb773f302c82f311fa, 42bef500d07b5769d916e9122a3e3fa3fd2245ef, fc7f105451044501a50cfd530cfa3b472c54acbc, 9e6c5169db423e51dcc66a73fd15409c0d38e088, 29bf41a9b59aff9f6197df58641a00037d567ca8, 9f74d28e903fa4fdf82f870d0aeadddc8196e41c
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)V3.1.6 and later; V3.1.7 and laterNot stated
LinuxLinux Kernel2.6.12.1 up to, but not including, 5.10.261; 5.11 up to, but not including, 5.15.212; 5.16 up to, but not including, 6.1.178; 6.2 up to, but not including, 6.6.145; 6.7 up to, but not including, 6.12.97; 6.13 up to, but not including, 6.18.39; 6.19 up to, but not including, 7.1.4; 2.6.12; and 1 more ranges5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.39

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
HighSuccess depends on conditions outside the attacker's control.
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:H/PR:L/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: netfilter: ebtables: zero chainstack array sashiko reports: looking at ebtables table translation, could a sparse cpu_possible_mask lead to an uninitialized pointer free? If cpu_possible_mask is sparse (for example, CPU 0 and CPU 2 are possible, but CPU 1 is not), the allocation loop skips CPU 1. If vmalloc_node() fails at CPU 2, the cleanup loop will blindly decrement and call vfree() on newinfo->chainstack[1]. Not a real-world bug, such allocation isn't expected to fail in the first place.

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

The underlying weakness: Use of Uninitialized Resource

The product uses or accesses a resource that has not been initialized.

How developers prevent this class of flaw

  • Explicitly initialize the resource before use. If this is performed through an API function or standard procedure, follow all required steps.
  • Pay close attention to complex conditionals that affect initialization, since some branches might not perform the initialization.
  • Avoid race conditions (CWE-362) during initialization routines.

More Use of Uninitialized Resource vulnerabilities (CWE-908)

Timeline

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

References

Recent Use of Uninitialized Resource vulnerabilities

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