VulnerabilityPublished 26 Jun 2026Updated 21 Oct 2026

CVE-2026-53317: Linux kernel · wifi: mt76: mt7921: Place upper limit on station AID

Source GCVE Database

Authoritative record:CVE-2026-53317

Not known to be exploited · CVSS 5.5 Medium · fixed in 35835ff71e6e618155578b8e3905597edd5f601c : update Linux kernel when convenient.

Data as of 26 Oct 2026, 15:59 UTC

CVSS 3.1 base score

5.5Medium

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 35835ff71e6e618155578b8e3905597edd5f601c, 9d63dd026644fa612a1fd348d5d3ab5d73df7fb8, 6dbe70f9ef14d8ac1c24bf19fd9510978a3ab952 +2

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

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

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

Attack Vector: Local: The vulnerable component is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or remotely (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., tricking a legitimate user into opening a malicious document).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
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: None: There is no loss of confidentiality within the impacted component.
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 26 Jun 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-86cw-5chj-gj42

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 5c14a5f944b91371961548b1907802f74a4d2e5c, < 35835ff71e6e618155578b8e3905597edd5f601c	Fixed in 35835ff71e6e618155578b8e3905597edd5f601c
LinuxLinux	Affected ≥ 5c14a5f944b91371961548b1907802f74a4d2e5c, < 9d63dd026644fa612a1fd348d5d3ab5d73df7fb8	Fixed in 9d63dd026644fa612a1fd348d5d3ab5d73df7fb8
LinuxLinux	Affected ≥ 5c14a5f944b91371961548b1907802f74a4d2e5c, < 6dbe70f9ef14d8ac1c24bf19fd9510978a3ab952	Fixed in 6dbe70f9ef14d8ac1c24bf19fd9510978a3ab952
LinuxLinux	Affected ≥ 5c14a5f944b91371961548b1907802f74a4d2e5c, < 4d0bf21e3e20619d51d06c0c36207aabab8b712c	Fixed in 4d0bf21e3e20619d51d06c0c36207aabab8b712c
LinuxLinux	Affected ≥ 5c14a5f944b91371961548b1907802f74a4d2e5c, < 1a4b802afe15c5b33b2dcb37a594aba2fa215d52	Fixed in 1a4b802afe15c5b33b2dcb37a594aba2fa215d52
LinuxLinux	Affected =5.12	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel mt76 driver to enforce an upper limit on station AIDs, preventing firmware crashes. Users should ensure they are running a Linux kernel version that includes this fix. Avoid using modified hostapd versions that assign AIDs above 20 on AP interfaces.

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7921: Place upper limit on station AID Any station configured with an AID over 20 causes a firmware crash. This situation occurred in our testing using an AP interface on 7922 hardware, with a modified hostapd, sourced from Mediatek's OpenWRT feeds. In stock hostapd, station AIDs begin counting at 1, and this configuration is prevented with an upper limit on associated stations. However, the modified hostapd began allocation at 65, which caused the firmware to crash. This fix does not allow these AIDs to work, but will prevent the firmware crash. This crash was only seen on IFTYPE_AP interfaces, and the fix does not appear to have an effect on IFTYPE_STATION behavior.

Impact

The vulnerability leads to a denial of service condition via firmware crash on affected AP interfaces when a station is assigned an AID over 20. There is no impact on confidentiality or integrity. The crash is triggered by out-of-range AID values from modified hostapd configurations. No known exploits are reported in the wild.

Summary

The Linux kernel mt76 driver for mt7921 hardware had a vulnerability where station AIDs above 20 caused firmware crashes on AP interfaces. This was observed with a modified hostapd that allocated AIDs starting at 65, unlike the stock hostapd which starts at 1 and enforces an upper limit on associated stations. The fix prevents firmware crashes by enforcing an upper limit on AIDs but does not enable operation with AIDs above 20. The issue does not affect station mode interfaces.

References

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