CyberSecBulletin
CVE-2024-36935NVD status: Analyzed

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2024-36935 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 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 5ff4de981983ed84f29b5d92b6550ec054e12a92, 666854ea9cad844f75a068f32812a2d78004914a 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 0.21% 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 5ff4de981983ed84f29b5d92b6550ec054e12a92 or 666854ea9cad844f75a068f32812a2d78004914a, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 6.8.10 or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux96a9a9341cdaea0c3bce4c134e04a2a42ae899ac up to, but not including, 5ff4de981983ed84f29b5d92b6550ec054e12a92; 96a9a9341cdaea0c3bce4c134e04a2a42ae899ac up to, but not including, 666854ea9cad844f75a068f32812a2d78004914a; 6.85ff4de981983ed84f29b5d92b6550ec054e12a92, 666854ea9cad844f75a068f32812a2d78004914a
LinuxLinux Kernel6.8 up to, but not including, 6.8.10; 6.96.8.10

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
NoneNothing can be modified.
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:N/A:H. Scored by NVD.

Official description

In the Linux kernel, the following vulnerability has been resolved: ice: ensure the copied buf is NUL terminated Currently, we allocate a count-sized kernel buffer and copy count bytes from userspace to that buffer. Later, we use sscanf on this buffer but we don't ensure that the string is terminated inside the buffer, this can lead to OOB read when using sscanf. Fix this issue by using memdup_user_nul instead of memdup_user.

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

The underlying weakness: Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

How developers prevent this class of flaw

  • Use a language that provides appropriate memory abstractions.

More Out-of-bounds Read vulnerabilities (CWE-125)

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 Out-of-bounds Read vulnerabilities

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