CyberSecBulletin
CVE-2026-43386NVD status: Analyzed

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-43386 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 6ff2243d5e05a5239e39d4ba61d96b0ea3bf7259, 12cc6e8f8d4245b7b5a408c6fc8ab1d098d67020, 209644e25757c499e1c1f08c071ea0386d4448b6 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 6ff2243d5e05a5239e39d4ba61d96b0ea3bf7259 or 12cc6e8f8d4245b7b5a408c6fc8ab1d098d67020 or 209644e25757c499e1c1f08c071ea0386d4448b6 or 768f25613a9fe6766d15a4a72979657adfc1c6d8, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.253 or 5.15.203 or 6.1.167 or 6.6.130, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux554c0a3abf216c991c5ebddcdb2c08689ecd290b up to, but not including, 6ff2243d5e05a5239e39d4ba61d96b0ea3bf7259; 554c0a3abf216c991c5ebddcdb2c08689ecd290b up to, but not including, 12cc6e8f8d4245b7b5a408c6fc8ab1d098d67020; 554c0a3abf216c991c5ebddcdb2c08689ecd290b up to, but not including, 209644e25757c499e1c1f08c071ea0386d4448b6; 554c0a3abf216c991c5ebddcdb2c08689ecd290b up to, but not including, 768f25613a9fe6766d15a4a72979657adfc1c6d8; 554c0a3abf216c991c5ebddcdb2c08689ecd290b up to, but not including, e14a1148f02e8cf1ca380d57e4b95ca36c97f45d; 554c0a3abf216c991c5ebddcdb2c08689ecd290b up to, but not including, 4dd2d9cf563c54e09d5f7eacf95c5b8f538b513b; 554c0a3abf216c991c5ebddcdb2c08689ecd290b up to, but not including, d97fc1b29513010b60fde874c7f0ba816744e18c; 554c0a3abf216c991c5ebddcdb2c08689ecd290b up to, but not including, a75281626fc8fa6dc6c9cc314ee423e8bc45203b; and 1 more ranges6ff2243d5e05a5239e39d4ba61d96b0ea3bf7259, 12cc6e8f8d4245b7b5a408c6fc8ab1d098d67020, 209644e25757c499e1c1f08c071ea0386d4448b6, 768f25613a9fe6766d15a4a72979657adfc1c6d8, e14a1148f02e8cf1ca380d57e4b95ca36c97f45d, 4dd2d9cf563c54e09d5f7eacf95c5b8f538b513b
LinuxLinux Kernel4.12 up to, but not including, 5.10.253; 5.11 up to, but not including, 5.15.203; 5.16 up to, but not including, 6.1.167; 6.2 up to, but not including, 6.6.130; 6.7 up to, but not including, 6.12.78; 6.13 up to, but not including, 6.18.19; 6.19 up to, but not including, 6.19.9; 7.05.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19

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: staging: rtl8723bs: fix potential out-of-bounds read in rtw_restruct_wmm_ie The current code checks 'i + 5 < in_len' at the end of the if statement. However, it accesses 'in_ie[i + 5]' before that check, which can lead to an out-of-bounds read. Move the length check to the beginning of the conditional to ensure the index is within bounds before accessing the array.

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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