VulnerabilityPublished 25 Jul 2026

CVE-2026-64443: Linux kernel · staging: rtl8723bs: fix OOB read in update_beacon_info() IE loop

Source GCVE Database

Authoritative record:CVE-2026-64443· High 8.1

Not known to be exploited · CVSS 8.1 High · fixed in ed51de4a86e173c3b0ef78e039c2e49e08b11f16 : patch Linux kernel soon.

Data as of 26 Oct 2026, 13:47 UTC

CVSS 3.1 base score

8.1High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 20% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in ed51de4a86e173c3b0ef78e039c2e49e08b11f16, bd953d52d587d42365e399b96c52dbdb13032070, b5cc2f999927f69723ca53f1f2a3aa37dbeda907 +4

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Attack Vector: Adjacent
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Adjacent: The vulnerable component is bound to the network stack, but the attack is limited at the protocol level to a logically adjacent topology. This can mean an attack must be launched from the same shared physical (e.g., Bluetooth or IEEE 802.11) or logical (e.g., local IP subnet) network, or from within a secure or otherwise limited administrative domain (e.g., MPLS, secure VPN to an administrative network zone).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-cffr-qfxf-qjr4

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < ed51de4a86e173c3b0ef78e039c2e49e08b11f16	Fixed in ed51de4a86e173c3b0ef78e039c2e49e08b11f16
LinuxLinux	Affected ≥ 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < bd953d52d587d42365e399b96c52dbdb13032070	Fixed in bd953d52d587d42365e399b96c52dbdb13032070
LinuxLinux	Affected ≥ 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < b5cc2f999927f69723ca53f1f2a3aa37dbeda907	Fixed in b5cc2f999927f69723ca53f1f2a3aa37dbeda907
LinuxLinux	Affected ≥ 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < 9193c34f75fd9e1ea8a590d7cced464c3380dc29	Fixed in 9193c34f75fd9e1ea8a590d7cced464c3380dc29
LinuxLinux	Affected ≥ 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < 69f174a0673b6b7a29b851adb60bc450cdc0ecc4	Fixed in 69f174a0673b6b7a29b851adb60bc450cdc0ecc4
LinuxLinux	Affected ≥ 554c0a3abf216c991c5ebddcdb2c08689ecd290b, < 6dd5e8c3011ebabf417257d7f07901a7c4311539	Fixed in 6dd5e8c3011ebabf417257d7f07901a7c4311539

AI-suggested

A fix for this vulnerability has been implemented in the Linux kernel rtl8723bs staging driver by adding proper bounds checks in the IE parsing loop. Users should apply the official kernel updates that include this patch once available.

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.

Impact

This vulnerability allows a malicious access point to send a specially crafted Beacon frame that triggers an out-of-bounds read in the kernel driver. Such a read can potentially lead to information disclosure or kernel memory corruption, which may affect system stability or security. However, no known exploits are reported in the wild at this time.

Summary

The vulnerability in the Linux kernel rtl8723bs staging driver involves an out-of-bounds read in the update_beacon_info() function's IE parsing loop. The loop increments by (pIE->length + 2) but only checks that the index is less than the buffer length, allowing a malicious Beacon frame with a crafted last IE to cause reads beyond the allocated buffer. The patch introduces two guards: one to break if fewer than the size of the IE header remain, and another to break if the IE's declared length extends beyond the buffer. It also adjusts the loop increment to use sizeof(*pIE) + pIE->length for consistency and safety.

References

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