VulnerabilityPublished 17 Sep 2026Updated 6 Oct 2026

CVE-2026-90350: Linux kernel · wifi: mt76: reject out-of-range link ids in mt76_vif_link()

Affects Linux kernelSource GCVE Database

Not known to be exploited.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 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.

What to do

Affected software

Product	Affected	Fixed in
Ubuntu 26.04 LTSlinux`pkg:deb/ubuntu/linux?arch=source&distro=resolute`Other threats	Affected 6.17.0-5.5 – 7.0.0-38.38 23 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-aws`pkg:deb/ubuntu/linux-aws?arch=source&distro=resolute`Other threats	Affected 6.17.0-1002.2 – 7.0.0-1014.14 15 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-azure`pkg:deb/ubuntu/linux-azure?arch=source&distro=resolute`Other threats	Affected 6.17.0-1003.3 – 7.0.0-1017.17 15 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-azure-fde`pkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resolute`Other threats	Affected 7.0.0-1003.3 – 7.0.0-1016.16 9 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-gcp`pkg:deb/ubuntu/linux-gcp?arch=source&distro=resolute`Other threats	Affected 6.17.0-1002.2 – 7.0.0-1014.14 13 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-gke`pkg:deb/ubuntu/linux-gke?arch=source&distro=resolute`Other threats	Affected 7.0.0-1002.3 – 7.0.0-1008.9 6 affected builds	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix has been implemented in the Linux kernel to reject out-of-range link IDs in the mt76_vif_link() function. Users should update to the patched kernel versions corresponding to their distributions. Since this is a kernel-level fix, applying official kernel updates from the vendor or distribution is the recommended remediation.

Description

A vulnerability in the Linux kernel's mt76 WiFi driver was resolved by adding bounds checking for link IDs in the mt76_vif_link() function. The function previously indexed an array without validating the link_id, potentially reading out-of-bounds memory. This issue affected specific Linux kernel versions used in various Ubuntu LTS releases. The vulnerability has been fixed by rejecting out-of-range link IDs and returning NULL, preventing out-of-bounds access.

Impact

The vulnerability could lead to out-of-bounds memory reads in the kernel's WiFi driver, which may cause memory corruption or unintended behavior. No known exploits in the wild have been reported. The impact is considered medium severity due to the potential for memory safety issues but no confirmed exploitation or privilege escalation details.

Summary

The Linux kernel mt76 WiFi driver contained a vulnerability where the mt76_vif_link() function indexed the mvif->link[] array without validating the link_id parameter. Callers passed mvif->deflink_id or msta->deflink_id, which could hold the value IEEE80211_LINK_UNSPECIFIED (0xf) before the first link was added. Since IEEE80211_MLD_MAX_NUM_LINKS is 15, this caused an out-of-bounds read one element past the end of the array, aliasing mt76_vif_data.offchannel_link. The vulnerability was reachable via functions mt7996_set_tsf(), mt7996_offset_tsf(), and mt7996_net_fill_forward_path(). The fix added bounds checking for link_id and returns NULL if out-of-range, aligning behavior with related functions mt7996_sta_link() and mt7996_sta_link_protected().

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 24 Oct 2026, 22:29 UTC

Technical details

References

Community reviews

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