PT-2026-64664 · Linux · Linux

CVE-2026-64443 · Published 2026-07-25 · Updated 2026-07-25

Mitre

CVSS v3.1

8.1

High

Base vector

AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

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.

Fix

Related Identifiers

CVE-2026-64443

Affected Products

Linux

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-64443 · Security Note
• https://git.kernel.org/stable/c/ed51de4a86e173c3b0ef78e039c2e49e08b11f16 · Note
• https://git.kernel.org/stable/c/69f174a0673b6b7a29b851adb60bc450cdc0ecc4 · Note
• https://git.kernel.org/stable/c/b5cc2f999927f69723ca53f1f2a3aa37dbeda907 · Note
• https://git.kernel.org/stable/c/6dd5e8c3011ebabf417257d7f07901a7c4311539 · Note
• https://git.kernel.org/stable/c/9193c34f75fd9e1ea8a590d7cced464c3380dc29 · Note
• https://git.kernel.org/stable/c/bd953d52d587d42365e399b96c52dbdb13032070 · Note
• https://git.kernel.org/stable/c/5e8db4cff5b45c7c4edc8ae3f302027c3bb32b25 · Note