CyberSecBulletin
CVE-2026-64443NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-64443 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. The record lists versions 5e8db4cff5b45c7c4edc8ae3f302027c3bb32b25, 6dd5e8c3011ebabf417257d7f07901a7c4311539, 9193c34f75fd9e1ea8a590d7cced464c3380dc29 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 0.28% 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 5e8db4cff5b45c7c4edc8ae3f302027c3bb32b25 or 6dd5e8c3011ebabf417257d7f07901a7c4311539 or 9193c34f75fd9e1ea8a590d7cced464c3380dc29 or bd953d52d587d42365e399b96c52dbdb13032070, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.15.212 or 6.1.178 or 6.6.145 or 6.12.96, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux554c0a3abf216c991c5ebddcdb2c08689ecd290b up to, but not including, 5e8db4cff5b45c7c4edc8ae3f302027c3bb32b25; 554c0a3abf216c991c5ebddcdb2c08689ecd290b up to, but not including, 6dd5e8c3011ebabf417257d7f07901a7c4311539; 554c0a3abf216c991c5ebddcdb2c08689ecd290b up to, but not including, 9193c34f75fd9e1ea8a590d7cced464c3380dc29; 554c0a3abf216c991c5ebddcdb2c08689ecd290b up to, but not including, bd953d52d587d42365e399b96c52dbdb13032070; 554c0a3abf216c991c5ebddcdb2c08689ecd290b up to, but not including, 69f174a0673b6b7a29b851adb60bc450cdc0ecc4; 554c0a3abf216c991c5ebddcdb2c08689ecd290b up to, but not including, b5cc2f999927f69723ca53f1f2a3aa37dbeda907; 554c0a3abf216c991c5ebddcdb2c08689ecd290b up to, but not including, ed51de4a86e173c3b0ef78e039c2e49e08b11f16; 4.125e8db4cff5b45c7c4edc8ae3f302027c3bb32b25, 6dd5e8c3011ebabf417257d7f07901a7c4311539, 9193c34f75fd9e1ea8a590d7cced464c3380dc29, bd953d52d587d42365e399b96c52dbdb13032070, 69f174a0673b6b7a29b851adb60bc450cdc0ecc4, b5cc2f999927f69723ca53f1f2a3aa37dbeda907
LinuxLinux Kernel4.12 up to, but not including, 5.15.212; 5.16 up to, but not including, 6.1.178; 6.2 up to, but not including, 6.6.145; 6.7 up to, but not including, 6.12.96; 6.13 up to, but not including, 6.18.39; 6.19 up to, but not including, 7.1.4; 7.25.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4

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
AdjacentThe attacker must be on the same local network segment.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
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:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H. Scored by CNA.

Official description

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix OOB read in update_beacon_info() IE loop The IE parsing loop in update_beacon_info() advances by (pIE->length + 2) each iteration but only guards on i < len. When a malicious AP sends a Beacon whose last IE has only one byte remaining in the frame (the element_id byte lands at len-1), the loop reads pIE->length from one byte past the allocated receive buffer. Additionally, even when the header bytes are in bounds, pIE->length itself can extend the data window beyond len, passing a truncated IE to the handler functions. Add two guards at the top of the loop body: 1. Break if fewer than sizeof(*pIE) bytes remain (can't read header). 2. Break if the IE's declared data extends past len. Also replace i += (pIE->length + 2) with i += sizeof(*pIE) + pIE->length for consistency with the sizeof(*pIE) guards added above.

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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