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

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k2.38

Summaryinfo

A vulnerability has been found in Linux Kernel up to 7.2-rc2 and classified as very critical. Affected is the function OnAuth of the component rtl8723bs. This manipulation causes out-of-bounds. The identification of this vulnerability is CVE-2026-64445. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as very critical was found in Linux Kernel up to 7.2-rc2. Affected by this vulnerability is the function OnAuth of the component rtl8723bs. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix WEP length underflow and OOB read in OnAuth() OnAuth() has two bugs in the shared-key authentication path. When the Privacy bit is set, rtw_wep_decrypt() is called without verifying that the frame is long enough to contain a valid WEP IV and ICV. Inside rtw_wep_decrypt(), length is computed as: length = len - WLAN_HDR_A3_LEN - iv_len and then passed as (length - 4) to crc32_le(). If len is less than WLAN_HDR_A3_LEN + iv_len + icv_len (32 bytes), length - 4 is negative and, after the implicit cast to size_t, causes crc32_le() to read far beyond the frame buffer. Add a minimum length check before accessing the IV field and calling the decryption path. When processing a seq=3 response, rtw_get_ie() stores the Challenge Text IE length in ie_len, but the subsequent memcmp() always reads 128 bytes regardless of ie_len. IEEE 802.11 mandates a challenge text of exactly 128 bytes; reject any IE whose length field differs, matching the check already applied to OnAuthClient().

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-64445 since 07/19/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/25/2026).

Upgrading to version 5.10.261, 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 665e1ecb68b4e8419604e70a33f02d1c8b0222c6/87cccc2a767f17dcab71e3b9fe5ae29b5516c5ce/c9000c93078e5c0a5a651b077c0ec92a4bc7d580/1f6c9d255bdda41216b6e34c96aa2b1abee0bb84/3e44a7665f3abd320a80d9c64ee4a93317041b8b/64ec4192d9c10e96922245d4a6747304cc76b19d/d90b9f39f375c9826ef145605dfe97765d0ecb91/a1fc19d61f661d47204f095b593de507884849f7 is able to eliminate this problem.

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Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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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 5.10.261/5.15.212/6.1.178/6.6.145/6.12.96/6.18.39/7.1.4/7.2-rc3
Patch: 665e1ecb68b4e8419604e70a33f02d1c8b0222c6/87cccc2a767f17dcab71e3b9fe5ae29b5516c5ce/c9000c93078e5c0a5a651b077c0ec92a4bc7d580/1f6c9d255bdda41216b6e34c96aa2b1abee0bb84/3e44a7665f3abd320a80d9c64ee4a93317041b8b/64ec4192d9c10e96922245d4a6747304cc76b19d/d90b9f39f375c9826ef145605dfe97765d0ecb91/a1fc19d61f661d47204f095b593de507884849f7

Timelineinfo

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

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64445 (🔒)
GCVE (CVE): GCVE-0-2026-64445
GCVE (VulDB): GCVE-100-383239

Entryinfo

Created: 07/25/2026 18:46
Changes: 07/25/2026 18:46 (59)
Complete: 🔍
Cache ID: 216::103

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