CyberSecBulletin
CVE-2024-35792NVD status: Modified

Linux: Use After Free

Published Updated By the CyberSecBulletin desk

CVE-2024-35792 is a high-severity use after free 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 48dd260fdb728eda4a246f635d1325e82f0d3555, eb2a41a8ae8c8c4f68aef3bd94665c0cf23e04be, c0afb6b88fbbc177fa322a835f874be217bffe45 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 0.22% 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 48dd260fdb728eda4a246f635d1325e82f0d3555 or eb2a41a8ae8c8c4f68aef3bd94665c0cf23e04be or c0afb6b88fbbc177fa322a835f874be217bffe45, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 6.6.24 or 6.7.12, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxc66c17a0f69b0e017bbc01d999a28ed96ee84826 up to, but not including, 48dd260fdb728eda4a246f635d1325e82f0d3555; c66c17a0f69b0e017bbc01d999a28ed96ee84826 up to, but not including, eb2a41a8ae8c8c4f68aef3bd94665c0cf23e04be; c66c17a0f69b0e017bbc01d999a28ed96ee84826 up to, but not including, c0afb6b88fbbc177fa322a835f874be217bffe45; 6.648dd260fdb728eda4a246f635d1325e82f0d3555, eb2a41a8ae8c8c4f68aef3bd94665c0cf23e04be, c0afb6b88fbbc177fa322a835f874be217bffe45
LinuxLinux Kernel6.6 up to, but not including, 6.6.24; 6.7 up to, but not including, 6.7.12; 6.86.6.24, 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 NVD.

Scoring systemScoreSeverityScored by
CVSS 3.17.8HighCNA
CVSS 3.17.8HighNVD

Official description

In the Linux kernel, the following vulnerability has been resolved: crypto: rk3288 - Fix use after free in unprepare The unprepare call must be carried out before the finalize call as the latter can free the request.

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

The underlying weakness: Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.

How developers prevent this class of flaw

  • Choose a language that provides automatic memory management.
  • When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.

More Use After Free vulnerabilities (CWE-416)

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 Use After Free vulnerabilities

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