CyberSecBulletin
CVE-2024-26810NVD status: Modified

Linux: Concurrent Execution using Shared Resource with Improper Synchronization

Published Updated By the CyberSecBulletin desk

CVE-2024-26810 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 1e71b6449d55179170efc8dee8664510bb813b42, 3dd9be6cb55e0f47544e7cdda486413f7134e3b3, ec73e079729258a05452356cf6d098bf1504d5a6 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 0.2% 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 1e71b6449d55179170efc8dee8664510bb813b42 or 3dd9be6cb55e0f47544e7cdda486413f7134e3b3 or ec73e079729258a05452356cf6d098bf1504d5a6 or 3fe0ac10bd117df847c93408a9d428a453cd60e5, whichever matches your release line, or a later version.
  2. Update SIMATIC S7-1500 TM MFP - GNU/Linux subsystem to V1.1.1 or a later version.
  3. Update Linux Kernel to 5.4.274 or 5.10.215 or 5.15.154 or 6.1.84, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 up to, but not including, 1e71b6449d55179170efc8dee8664510bb813b42; 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 up to, but not including, 3dd9be6cb55e0f47544e7cdda486413f7134e3b3; 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 up to, but not including, ec73e079729258a05452356cf6d098bf1504d5a6; 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 up to, but not including, 3fe0ac10bd117df847c93408a9d428a453cd60e5; 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 up to, but not including, 04a4a017b9ffd7b0f427b8c376688d14cb614651; 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 up to, but not including, 6fe478d855b20ac1eb5da724afe16af5a2aaaa40; 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 up to, but not including, 03505e3344b0576fd619416793a31eae9c5b73bf; 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 up to, but not including, 810cd4bb53456d0503cc4e7934e063835152c1b7; and 1 more ranges1e71b6449d55179170efc8dee8664510bb813b42, 3dd9be6cb55e0f47544e7cdda486413f7134e3b3, ec73e079729258a05452356cf6d098bf1504d5a6, 3fe0ac10bd117df847c93408a9d428a453cd60e5, 04a4a017b9ffd7b0f427b8c376688d14cb614651, 6fe478d855b20ac1eb5da724afe16af5a2aaaa40
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystembefore V1.1.1V1.1.1
LinuxLinux Kernel3.6 up to, but not including, 5.4.274; 5.5 up to, but not including, 5.10.215; 5.11 up to, but not including, 5.15.154; 5.16 up to, but not including, 6.1.84; 6.2 up to, but not including, 6.6.24; 6.7 up to, but not including, 6.7.12; 6.8 up to, but not including, 6.8.35.4.274, 5.10.215, 5.15.154, 6.1.84, 6.6.24, 6.7.12

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
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.

Scoring systemScoreSeverityScored by
CVSS 3.17.8HighCNA
CVSS 3.14.4MediumCISA (ADP)

Official description

In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Lock external INTx masking ops Mask operations through config space changes to DisINTx may race INTx configuration changes via ioctl. Create wrappers that add locking for paths outside of the core interrupt code. In particular, irq_type is updated holding igate, therefore testing is_intx() requires holding igate. For example clearing DisINTx from config space can otherwise race changes of the interrupt configuration. This aligns interfaces which may trigger the INTx eventfd into two camps, one side serialized by igate and the other only enabled while INTx is configured. A subsequent patch introduces synchronization for the latter flows.

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: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Recent Concurrent Execution using Shared Resource with Improper Synchronization vulnerabilities

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