CyberSecBulletin
CVE-2023-52626NVD status: Analyzed

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2023-52626 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 40e0d0746390c5b0c31144f4f1688d72f3f8d790, 33cdeae8c6fb58cc445f859b67c014dc9f60b4e0, 3876638b2c7ebb2c9d181de1191db0de8cac143a 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 0.24% 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 40e0d0746390c5b0c31144f4f1688d72f3f8d790 or 33cdeae8c6fb58cc445f859b67c014dc9f60b4e0 or 3876638b2c7ebb2c9d181de1191db0de8cac143a or 6.6.15, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 6.6.15 or 6.7.3, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxe5d30f7da35720060299483e65fc372980a82dfb up to, but not including, 40e0d0746390c5b0c31144f4f1688d72f3f8d790; 92214be5979c0961a471b7eaaaeacab41bdf456c up to, but not including, 33cdeae8c6fb58cc445f859b67c014dc9f60b4e0; 92214be5979c0961a471b7eaaaeacab41bdf456c up to, but not including, 3876638b2c7ebb2c9d181de1191db0de8cac143a; 42b11d1293e5a0f932c0b6e891b2c7bae57b839d; 6.6.3 up to, but not including, 6.6.15; 6.5.13 up to, but not including, 6.6; 6.740e0d0746390c5b0c31144f4f1688d72f3f8d790, 33cdeae8c6fb58cc445f859b67c014dc9f60b4e0, 3876638b2c7ebb2c9d181de1191db0de8cac143a, 6.6.15, 6.6
LinuxLinux Kernel6.6.3 up to, but not including, 6.6.15; 6.7 up to, but not including, 6.7.3; 6.86.6.15, 6.7.3

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: net/mlx5e: Fix operation precedence bug in port timestamping napi_poll context Indirection (*) is of lower precedence than postfix increment (++). Logic in napi_poll context would cause an out-of-bound read by first increment the pointer address by byte address space and then dereference the value. Rather, the intended logic was to dereference first and then increment the underlying value.

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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