CyberSecBulletin
CVE-2022-49278NVD status: Analyzed

Linux: Integer Underflow (Wrap or Wraparound)

Published Updated By the CyberSecBulletin desk

CVE-2022-49278 is a high-severity integer underflow (wrap or wraparound) 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 b97b305656a7013690e7b6e310f0e827e0bbff90, 34afac3c75fa08d6fabbab4c93f0a90618afaaa6, a8c3e53517985d69040a1b36a269e85f99cf0cea 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 0.27% 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 b97b305656a7013690e7b6e310f0e827e0bbff90 or 34afac3c75fa08d6fabbab4c93f0a90618afaaa6 or a8c3e53517985d69040a1b36a269e85f99cf0cea or 11572dad9fbadbd9269a2550f7e236b5b8c2d80c, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.110 or 5.15.33 or 5.16.19 or 5.17.2, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux3afdc59e4390487f04f2435b7e8a6289984e0a1e up to, but not including, b97b305656a7013690e7b6e310f0e827e0bbff90; 3afdc59e4390487f04f2435b7e8a6289984e0a1e up to, but not including, 34afac3c75fa08d6fabbab4c93f0a90618afaaa6; 3afdc59e4390487f04f2435b7e8a6289984e0a1e up to, but not including, a8c3e53517985d69040a1b36a269e85f99cf0cea; 3afdc59e4390487f04f2435b7e8a6289984e0a1e up to, but not including, 11572dad9fbadbd9269a2550f7e236b5b8c2d80c; 3afdc59e4390487f04f2435b7e8a6289984e0a1e up to, but not including, f89672cc3681952f2d06314981a6b45f8b0045d1; 5.9b97b305656a7013690e7b6e310f0e827e0bbff90, 34afac3c75fa08d6fabbab4c93f0a90618afaaa6, a8c3e53517985d69040a1b36a269e85f99cf0cea, 11572dad9fbadbd9269a2550f7e236b5b8c2d80c, f89672cc3681952f2d06314981a6b45f8b0045d1
LinuxLinux Kernel5.9 up to, but not including, 5.10.110; 5.11 up to, but not including, 5.15.33; 5.16 up to, but not including, 5.16.19; 5.17 up to, but not including, 5.17.25.10.110, 5.15.33, 5.16.19, 5.17.2

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
NoneNo data is disclosed.
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:N/I:H/A:H. Scored by NVD.

Official description

In the Linux kernel, the following vulnerability has been resolved: remoteproc: Fix count check in rproc_coredump_write() Check count for 0, to avoid a potential underflow. Make the check the same as the one in rproc_recovery_write().

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

The underlying weakness: Integer Underflow (Wrap or Wraparound)

The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

More Integer Underflow (Wrap or Wraparound) vulnerabilities (CWE-191)

Timeline

  1. CVE record published.
  2. Record last changed materially (score, affected products, status or references).

References

Recent Integer Underflow (Wrap or Wraparound) vulnerabilities

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