CyberSecBulletin
CVE-2026-43256NVD status: Analyzed

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-43256 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 e6cbf765686fb6c1d8f2530b3daf6c66efc92f5d, 0c074e80921fd18984b75836730d76c768c84f65, 1b103307df6d461a0731be25aca69ad0335b0933 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 e6cbf765686fb6c1d8f2530b3daf6c66efc92f5d or 0c074e80921fd18984b75836730d76c768c84f65 or 1b103307df6d461a0731be25aca69ad0335b0933 or fade67c88870f497a13ed450ba01f7236c92dd9b, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 6.1.167 or 6.6.128 or 6.12.75 or 6.18.16, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux4edc8eae715cecf5f8bf12a0c77c281f336c37db up to, but not including, e6cbf765686fb6c1d8f2530b3daf6c66efc92f5d; 4edc8eae715cecf5f8bf12a0c77c281f336c37db up to, but not including, 0c074e80921fd18984b75836730d76c768c84f65; 4edc8eae715cecf5f8bf12a0c77c281f336c37db up to, but not including, 1b103307df6d461a0731be25aca69ad0335b0933; 4edc8eae715cecf5f8bf12a0c77c281f336c37db up to, but not including, fade67c88870f497a13ed450ba01f7236c92dd9b; 4edc8eae715cecf5f8bf12a0c77c281f336c37db up to, but not including, e7a38ecda2498e7ce998793ac2a46ca47317635d; 4edc8eae715cecf5f8bf12a0c77c281f336c37db up to, but not including, d965919af524e68cb2ab1a685872050ad2ee933d; 5.18e6cbf765686fb6c1d8f2530b3daf6c66efc92f5d, 0c074e80921fd18984b75836730d76c768c84f65, 1b103307df6d461a0731be25aca69ad0335b0933, fade67c88870f497a13ed450ba01f7236c92dd9b, e7a38ecda2498e7ce998793ac2a46ca47317635d, d965919af524e68cb2ab1a685872050ad2ee933d
LinuxLinux Kernel5.18 up to, but not including, 6.1.167; 6.2 up to, but not including, 6.6.128; 6.7 up to, but not including, 6.12.75; 6.13 up to, but not including, 6.18.16; 6.19 up to, but not including, 6.19.66.1.167, 6.6.128, 6.12.75, 6.18.16, 6.19.6

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: media: qcom: camss: vfe: Fix out-of-bounds access in vfe_isr_reg_update() vfe_isr() iterates using MSM_VFE_IMAGE_MASTERS_NUM(7) as the loop bound and passes the index to vfe_isr_reg_update(). However, vfe->line[] array is defined with VFE_LINE_NUM_MAX(4): struct vfe_line line[VFE_LINE_NUM_MAX]; When index is 4, 5, 6, the access to vfe->line[line_id] exceeds the array bounds and resulting in out-of-bounds memory access. Fix this by using separate loops for output lines and write masters.

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

References

Recent Out-of-bounds Read vulnerabilities

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