CyberSecBulletin
CVE-2026-64279NVD status: Modified

Linux: Concurrent Execution using Shared Resource with Improper Synchronization

Published Updated By the CyberSecBulletin desk

CVE-2026-64279 is a high-severity concurrent execution using shared resource with improper synchronization 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 d39282f552dd6c35b9b84b4af78f1198c24f3373, 11dfa37bf544cc806f21742ca2fd2d841bd7032e, 9882a9bd74db08e7bae5821a7050627ae92d3380 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 0.15% 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 d39282f552dd6c35b9b84b4af78f1198c24f3373 or 11dfa37bf544cc806f21742ca2fd2d841bd7032e or 9882a9bd74db08e7bae5821a7050627ae92d3380 or bb234487a447a99315add1b46aa57b72e163e1eb, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.15.212 or 6.1.178 or 6.6.145 or 6.12.96, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux35fc37f8188177e3ba3e7f99a6e3300e490e9181 up to, but not including, d39282f552dd6c35b9b84b4af78f1198c24f3373; 35fc37f8188177e3ba3e7f99a6e3300e490e9181 up to, but not including, 11dfa37bf544cc806f21742ca2fd2d841bd7032e; 35fc37f8188177e3ba3e7f99a6e3300e490e9181 up to, but not including, 9882a9bd74db08e7bae5821a7050627ae92d3380; 35fc37f8188177e3ba3e7f99a6e3300e490e9181 up to, but not including, bb234487a447a99315add1b46aa57b72e163e1eb; 35fc37f8188177e3ba3e7f99a6e3300e490e9181 up to, but not including, b6d2af6fe9c1f5ec0484536753c979cbd40a8ac3; 35fc37f8188177e3ba3e7f99a6e3300e490e9181 up to, but not including, 35dbd1f1f603401155cbd3a180bb18e3a3b675b8; 35fc37f8188177e3ba3e7f99a6e3300e490e9181 up to, but not including, b1a58ed9eab146b36f41a55db8f5d7ce9fdedf3f; 2.6.31d39282f552dd6c35b9b84b4af78f1198c24f3373, 11dfa37bf544cc806f21742ca2fd2d841bd7032e, 9882a9bd74db08e7bae5821a7050627ae92d3380, bb234487a447a99315add1b46aa57b72e163e1eb, b6d2af6fe9c1f5ec0484536753c979cbd40a8ac3, 35dbd1f1f603401155cbd3a180bb18e3a3b675b8
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 Kernel2.6.31 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, 6.12.96; 6.13 up to, but not including, 6.18.39; 6.19 up to, but not including, 7.1.45.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4

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 CNA.

Official description

In the Linux kernel, the following vulnerability has been resolved: i2c: core: fix adapter deregistration race Adapters can be looked up by their id using i2c_get_adapter() which takes a reference to the embedded struct device. Remove the adapter from the IDR before tearing it down during deregistration (and on registration failure) to make sure its resources are not accessed after having been freed (e.g. the device name).

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

The underlying weakness: Concurrent Execution using Shared Resource with Improper Synchronization

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

How developers prevent this class of flaw

  • In languages that support it, use synchronization primitives. Only wrap these around critical code to minimize the impact on performance.
  • Use thread-safe capabilities such as the data access abstraction in Spring.
  • Minimize the usage of shared resources in order to remove as much complexity as possible from the control flow and to reduce the likelihood of unexpected conditions occurring. Additionally, this will minimize the amount of synchronization necessary and may even help to reduce the likelihood of a denial of service where an attacker may be able to repeatedly trigger a critical section (CWE-400).

More Concurrent Execution using Shared Resource with Improper Synchronization vulnerabilities (CWE-362)

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 Concurrent Execution using Shared Resource with Improper Synchronization vulnerabilities

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