Description
In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: validate individual TWT params before driver setup

ieee80211_process_rx_twt_action() only partially validates a received
S1G TWT setup frame before queueing it.

An individual agreement can therefore reach ieee80211_s1g_rx_twt_setup()
with twt->length too short for the full struct ieee80211_twt_params.

The individual path passes twt to drv_add_twt_setup(). Both the tracepoint
and the driver callback consume the complete parameters block, not merely
req_type. Do not pass a short individual agreement to the driver.
Broadcast agreements remain unchanged because they are rejected locally
after accessing only req_type.

[edit commit message to not overclaim lack of validation nor
understate driver impact]
Published: 2026-08-28
Score: 8.8 High
EPSS: < 1% Very Low
KEV: No
Impact: Kernel memory corruption
Action: Upgrade kernel
AI Analysis

Impact

An insufficient validation of Individual Target Wake Time frames in the Linux mac80211 subsystem allows a truncated TWT setup frame to be processed. The kernel code accepts a frame whose length field is shorter than the size of the full ieee80211_twt_params structure and passes this truncated data to the driver. Based on the description, it is inferred that the driver may read beyond the intended buffer, causing kernel memory corruption and potentially a crash; if an attacker can influence the contents, there is a possible, but not proven, path to arbitrary code execution. The impact is kernel memory corruption.

Affected Systems

All Linux kernel installations that include the mac80211 wireless stack and provide the S1G Target Wake Time feature, and that have not incorporated the patch commits referenced in the advisory, are affected. The advisory does not list specific kernel versions, so any kernel lacking those commits is presumed vulnerable.

Risk and Exploitability

The CVSS score of 8.8 indicates severe severity, while the EPSS score of less than 1% suggests a low probability of exploitation at this time. The CVE is not listed in the CISA KEV catalog. The likely attack vector is a Wi‑Fi device within range that can transmit crafted TWT frames; based on the description, it is inferred that a nearby attacker could trigger the vulnerability by sending such frames. No public exploit has been reported, but kernel memory corruption makes it a serious risk if malicious frames can be delivered.

Generated by OpenCVE AI on September 1, 2026 at 15:06 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Install a kernel update that incorporates the referenced commits to patch the mac80211 TWT handling code.
  • Update all wireless drivers to versions compatible with the patched kernel implementation, ensuring the driver’s own validation logic aligns with the kernel changes.
  • If a kernel upgrade is not immediately feasible, disable S1G TWT support in the kernel configuration (CONFIG_MAC80211_S1G_TWT) or block S1G traffic at the network perimeter to prevent exploitation.

Generated by OpenCVE AI on September 1, 2026 at 15:06 UTC.

Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4777-1 linux security update
History

Tue, 01 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-805
References
Metrics threat_severity

None

threat_severity

Moderate


Sat, 29 Aug 2026 10:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119

Sat, 29 Aug 2026 08:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-125
CWE-787

Sat, 29 Aug 2026 06:45:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Fri, 28 Aug 2026 16:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-125
CWE-787

Fri, 28 Aug 2026 14:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119
CWE-20

Fri, 28 Aug 2026 11:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119
CWE-20

Fri, 28 Aug 2026 07:30:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: validate individual TWT params before driver setup ieee80211_process_rx_twt_action() only partially validates a received S1G TWT setup frame before queueing it. An individual agreement can therefore reach ieee80211_s1g_rx_twt_setup() with twt->length too short for the full struct ieee80211_twt_params. The individual path passes twt to drv_add_twt_setup(). Both the tracepoint and the driver callback consume the complete parameters block, not merely req_type. Do not pass a short individual agreement to the driver. Broadcast agreements remain unchanged because they are rejected locally after accessing only req_type. [edit commit message to not overclaim lack of validation nor understate driver impact]
Title wifi: mac80211: validate individual TWT params before driver setup
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Subscriptions

Linux Linux Kernel
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-29T06:22:38.281Z

Reserved: 2026-08-26T14:34:25.788Z

Link: CVE-2026-80722

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-28T08:16:58.000

Modified: 2026-08-29T07:16:54.203

Link: CVE-2026-80722

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-08-28T00:00:00Z

Links: CVE-2026-80722 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-01T15:15:12Z

Weaknesses
  • CWE-119

    Improper Restriction of Operations within the Bounds of a Memory Buffer

  • CWE-805

    Buffer Access with Incorrect Length Value