Linux Kernel up to 7.2-rc2 rtl8723bs update_beacon_info out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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7.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 7.2-rc2. This affects the function update_beacon_info of the component rtl8723bs. The manipulation leads to out-of-bounds. This vulnerability is uniquely identified as CVE-2026-64443. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.2-rc2. It has been rated as critical. This issue affects the function update_beacon_info of the component rtl8723bs. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-64443 since 07/19/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/04/2026).

Upgrading to version 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4 or 7.2-rc3 eliminates this vulnerability. Applying the patch 5e8db4cff5b45c7c4edc8ae3f302027c3bb32b25/6dd5e8c3011ebabf417257d7f07901a7c4311539/9193c34f75fd9e1ea8a590d7cced464c3380dc29/bd953d52d587d42365e399b96c52dbdb13032070/69f174a0673b6b7a29b851adb60bc450cdc0ecc4/b5cc2f999927f69723ca53f1f2a3aa37dbeda907/ed51de4a86e173c3b0ef78e039c2e49e08b11f16 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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Name

Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.7
VulDB Meta Temp Score: 7.5

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.1
CNA Vector (Linux): 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.212/6.1.178/6.6.145/6.12.96/6.18.39/7.1.4/7.2-rc3
Patch: 5e8db4cff5b45c7c4edc8ae3f302027c3bb32b25/6dd5e8c3011ebabf417257d7f07901a7c4311539/9193c34f75fd9e1ea8a590d7cced464c3380dc29/bd953d52d587d42365e399b96c52dbdb13032070/69f174a0673b6b7a29b851adb60bc450cdc0ecc4/b5cc2f999927f69723ca53f1f2a3aa37dbeda907/ed51de4a86e173c3b0ef78e039c2e49e08b11f16

Timelineinfo

07/19/2026 CVE reserved
07/25/2026 +6 days Advisory disclosed
07/25/2026 +0 days VulDB entry created
09/04/2026 +41 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64443 (🔒)
GCVE (CVE): GCVE-0-2026-64443
GCVE (VulDB): GCVE-100-383237

Entryinfo

Created: 07/25/2026 18:45
Updated: 09/04/2026 02:54
Changes: 07/25/2026 18:45 (59), 09/04/2026 02:54 (11)
Complete: 🔍
Cache ID: 216::103

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