CyberSecBulletin
CVE-2026-31761NVD status: Modified

Linux: Concurrent Execution using Shared Resource with Improper Synchronization

Published Updated By the CyberSecBulletin desk

CVE-2026-31761 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 22487ef85f6dd9499ddf49b85a08afc50a3f1992, caec338f91469f0a70b68165185afa3abc994545, 051ca43b0e0e4b66bfd349cd53ccf231ad1d69b7 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 0.1% 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 22487ef85f6dd9499ddf49b85a08afc50a3f1992 or caec338f91469f0a70b68165185afa3abc994545 or 051ca43b0e0e4b66bfd349cd53ccf231ad1d69b7 or 2a4537653d200fda2a8516083459f8ff6194f8fc, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.253 or 5.15.203 or 6.1.168 or 6.6.134, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux3904b28efb2c780c23dcddfb87e07fe0230661e5 up to, but not including, 22487ef85f6dd9499ddf49b85a08afc50a3f1992; 3904b28efb2c780c23dcddfb87e07fe0230661e5 up to, but not including, caec338f91469f0a70b68165185afa3abc994545; 3904b28efb2c780c23dcddfb87e07fe0230661e5 up to, but not including, 051ca43b0e0e4b66bfd349cd53ccf231ad1d69b7; 3904b28efb2c780c23dcddfb87e07fe0230661e5 up to, but not including, 2a4537653d200fda2a8516083459f8ff6194f8fc; 3904b28efb2c780c23dcddfb87e07fe0230661e5 up to, but not including, 92f18aa86302fe83e0726a1191015f427d4ff056; 3904b28efb2c780c23dcddfb87e07fe0230661e5 up to, but not including, cc3de12a5612ee25df7fb549cb7b3e4cc8bfaf9c; 3904b28efb2c780c23dcddfb87e07fe0230661e5 up to, but not including, 59a317f8215674c8330817770497301bfb2c1b99; 3904b28efb2c780c23dcddfb87e07fe0230661e5 up to, but not including, 4c05799449108fb0e0a6bd30e65fffc71e60db4d; and 1 more ranges22487ef85f6dd9499ddf49b85a08afc50a3f1992, caec338f91469f0a70b68165185afa3abc994545, 051ca43b0e0e4b66bfd349cd53ccf231ad1d69b7, 2a4537653d200fda2a8516083459f8ff6194f8fc, 92f18aa86302fe83e0726a1191015f427d4ff056, cc3de12a5612ee25df7fb549cb7b3e4cc8bfaf9c
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)V3.1.6 and later; V3.1.5 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; V3.1.5 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; V3.1.5 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; V3.1.5 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; V3.1.5 and later; V3.1.7 and laterNot stated
LinuxLinux Kernel4.10 up to, but not including, 5.10.253; 5.11 up to, but not including, 5.15.203; 5.16 up to, but not including, 6.1.168; 6.2 up to, but not including, 6.6.134; 6.7 up to, but not including, 6.12.81; 6.13 up to, but not including, 6.18.22; 6.19 up to, but not including, 6.19.12; 7.05.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22

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: iio: gyro: mpu3050: Move iio_device_register() to correct location iio_device_register() should be at the end of the probe function to prevent race conditions. Place iio_device_register() at the end of the probe function and place iio_device_unregister() accordingly.

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. 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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