CyberSecBulletin
CVE-2026-31442NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-31442 is a high-severity out-of-bounds read 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 504c0e6751001ac46917c73e703f2b1b92cfc026, 867d0c801f21370d561420fa32f2ea1a7dc3a22d, d6077df7b75d26e4edf98983836c05d00ebabd8d 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 0.13% 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 504c0e6751001ac46917c73e703f2b1b92cfc026 or 867d0c801f21370d561420fa32f2ea1a7dc3a22d or d6077df7b75d26e4edf98983836c05d00ebabd8d, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 6.18.21 or 6.19.11, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux98d187a989036096feaa2fef1ec3b2240ecdeacf up to, but not including, 504c0e6751001ac46917c73e703f2b1b92cfc026; 98d187a989036096feaa2fef1ec3b2240ecdeacf up to, but not including, 867d0c801f21370d561420fa32f2ea1a7dc3a22d; 98d187a989036096feaa2fef1ec3b2240ecdeacf up to, but not including, d6077df7b75d26e4edf98983836c05d00ebabd8d; 6.14504c0e6751001ac46917c73e703f2b1b92cfc026, 867d0c801f21370d561420fa32f2ea1a7dc3a22d, d6077df7b75d26e4edf98983836c05d00ebabd8d
LinuxLinux Kernel6.14 up to, but not including, 6.18.21; 6.19 up to, but not including, 6.19.11; 7.06.18.21, 6.19.11

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 CNA.

Official description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Fix possible invalid memory access after FLR In the case that the first Function Level Reset (FLR) concludes correctly, but in the second FLR the scratch area for the saved configuration cannot be allocated, it's possible for a invalid memory access to happen. Always set the deallocated scratch area to NULL after FLR completes.

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: total).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

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