CyberSecBulletin
CVE-2022-48966NVD status: Analyzed

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2022-48966 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 3ceffb8f410b93553fb16fe7e84aa0d35b3ba79b, 47a1a2f6cd5ec3a4f8a2d9bfa1e0605347cdb92c, 5a142486a0db6b0b85031f22d69acd0cdcf8f72b 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 3ceffb8f410b93553fb16fe7e84aa0d35b3ba79b or 47a1a2f6cd5ec3a4f8a2d9bfa1e0605347cdb92c or 5a142486a0db6b0b85031f22d69acd0cdcf8f72b or eec1fc21edc2bb99c9e66cf66f0b5d4d643fbb50, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 4.9.336 or 4.14.302 or 4.19.269 or 5.4.227, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxcad5d847a093077b499a8b0bbfe6804b9226c03e up to, but not including, 3ceffb8f410b93553fb16fe7e84aa0d35b3ba79b; cad5d847a093077b499a8b0bbfe6804b9226c03e up to, but not including, 47a1a2f6cd5ec3a4f8a2d9bfa1e0605347cdb92c; cad5d847a093077b499a8b0bbfe6804b9226c03e up to, but not including, 5a142486a0db6b0b85031f22d69acd0cdcf8f72b; cad5d847a093077b499a8b0bbfe6804b9226c03e up to, but not including, eec1fc21edc2bb99c9e66cf66f0b5d4d643fbb50; cad5d847a093077b499a8b0bbfe6804b9226c03e up to, but not including, 146ebee8fcdb349d7ec0e49915e6cdafb92544ae; cad5d847a093077b499a8b0bbfe6804b9226c03e up to, but not including, a6b30598fec84f8809f5417cde73071ca43e8471; cad5d847a093077b499a8b0bbfe6804b9226c03e up to, but not including, 6ca0a506dddc3e1d636935eef339576b263bf3d8; cad5d847a093077b499a8b0bbfe6804b9226c03e up to, but not including, e8b4fc13900b8e8be48debffd0dfd391772501f7; and 1 more ranges3ceffb8f410b93553fb16fe7e84aa0d35b3ba79b, 47a1a2f6cd5ec3a4f8a2d9bfa1e0605347cdb92c, 5a142486a0db6b0b85031f22d69acd0cdcf8f72b, eec1fc21edc2bb99c9e66cf66f0b5d4d643fbb50, 146ebee8fcdb349d7ec0e49915e6cdafb92544ae, a6b30598fec84f8809f5417cde73071ca43e8471
LinuxLinux Kernel4.5 up to, but not including, 4.9.336; 4.10 up to, but not including, 4.14.302; 4.15 up to, but not including, 4.19.269; 4.20 up to, but not including, 5.4.227; 5.5 up to, but not including, 5.10.159; 5.11 up to, but not including, 5.15.83; 5.16 up to, but not including, 6.0.13; 6.14.9.336, 4.14.302, 4.19.269, 5.4.227, 5.10.159, 5.15.83

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: mvneta: Prevent out of bounds read in mvneta_config_rss() The pp->indir[0] value comes from the user. It is passed to: if (cpu_online(pp->rxq_def)) inside the mvneta_percpu_elect() function. It needs bounds checkeding to ensure that it is not beyond the end of the cpu bitmap.

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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