CyberSecBulletin
CVE-2024-26779NVD status: Modified

Linux: Concurrent Execution using Shared Resource with Improper Synchronization

Published Updated By the CyberSecBulletin desk

CVE-2024-26779 is a high-severity concurrent execution using shared resource with improper synchronization vulnerability in Linux, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. The record lists versions 76fad1174a0cae6fc857b9f88b261a2e4f07d587, 85720b69aef177318f4a18efbcc4302228a340e5, 5ffab99e070b9f8ae0cf60c3c3602b84eee818dd 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 0.28% 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 76fad1174a0cae6fc857b9f88b261a2e4f07d587 or 85720b69aef177318f4a18efbcc4302228a340e5 or 5ffab99e070b9f8ae0cf60c3c3602b84eee818dd or 88c18fd06608b3adee547102505d715f21075c9d, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 4.19.308 or 5.4.270 or 5.10.211 or 5.15.150, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux17c18bf880b2464851e5a2bca86521affc46c97e up to, but not including, 76fad1174a0cae6fc857b9f88b261a2e4f07d587; 17c18bf880b2464851e5a2bca86521affc46c97e up to, but not including, 85720b69aef177318f4a18efbcc4302228a340e5; 17c18bf880b2464851e5a2bca86521affc46c97e up to, but not including, 5ffab99e070b9f8ae0cf60c3c3602b84eee818dd; 17c18bf880b2464851e5a2bca86521affc46c97e up to, but not including, 88c18fd06608b3adee547102505d715f21075c9d; 17c18bf880b2464851e5a2bca86521affc46c97e up to, but not including, eb39bb548bf974acad7bd6780fe11f9e6652d696; 17c18bf880b2464851e5a2bca86521affc46c97e up to, but not including, 54b79d8786964e2f840e8a2ec4a9f9a50f3d4954; 17c18bf880b2464851e5a2bca86521affc46c97e up to, but not including, 281280276b70c822f55ce15b661f6d1d3228aaa9; 17c18bf880b2464851e5a2bca86521affc46c97e up to, but not including, bcbc84af1183c8cf3d1ca9b78540c2185cd85e7f; and 1 more ranges76fad1174a0cae6fc857b9f88b261a2e4f07d587, 85720b69aef177318f4a18efbcc4302228a340e5, 5ffab99e070b9f8ae0cf60c3c3602b84eee818dd, 88c18fd06608b3adee547102505d715f21075c9d, eb39bb548bf974acad7bd6780fe11f9e6652d696, 54b79d8786964e2f840e8a2ec4a9f9a50f3d4954
LinuxLinux Kernelbefore 4.19.308; 4.20 up to, but not including, 5.4.270; 5.5 up to, but not including, 5.10.211; 5.11 up to, but not including, 5.15.150; 5.16 up to, but not including, 6.1.80; 6.2 up to, but not including, 6.6.19; 6.7 up to, but not including, 6.7.7; 6.84.19.308, 5.4.270, 5.10.211, 5.15.150, 6.1.80, 6.6.19
DebianDebian Linux10.0Not stated

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
AdjacentThe attacker must be on the same local network segment.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA.

Scoring systemScoreSeverityScored by
CVSS 3.18.8HighCNA
CVSS 3.15.5MediumCISA (ADP)

Official description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: fix race condition on enabling fast-xmit fast-xmit must only be enabled after the sta has been uploaded to the driver, otherwise it could end up passing the not-yet-uploaded sta via drv_tx calls to the driver, leading to potential crashes because of uninitialized drv_priv data. Add a missing sta->uploaded check and re-check fast xmit after inserting a sta.

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

Recent Concurrent Execution using Shared Resource with Improper Synchronization vulnerabilities

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