VulnerabilityPublished 6 Oct 2026Updated 19 Oct 2026

CVE-2026-98292: Linux kernel · Bluetooth: btmtksdio, btmtkuart: validate WMT event length before struct access

Affects Linux kernelSource CVE Database V5

Not known to be exploited : upgrade to 8879e3e0a84a86954c855caceead4867e74a9a27 or 5a5cfd8488c97e1b8939515429fe4c81e9f2df4f when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

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 8879e3e0a84a86954c855caceead4867e74a9a27, 5a5cfd8488c97e1b8939515429fe4c81e9f2df4f

Exploitation evidence

Disclosed: evidence found.
CVE published 6 Oct 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

Upgrade Linux kernel to 8879e3e0a84a86954c855caceead4867e74a9a27 or 5a5cfd8488c97e1b8939515429fe4c81e9f2df4f.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ e0b67035a90b58d01f911fed77b6e3da153da66e, < 8879e3e0a84a86954c855caceead4867e74a9a27	Fixed in 8879e3e0a84a86954c855caceead4867e74a9a27
LinuxLinux	Affected ≥ e0b67035a90b58d01f911fed77b6e3da153da66e, < 5a5cfd8488c97e1b8939515429fe4c81e9f2df4f	Fixed in 5a5cfd8488c97e1b8939515429fe4c81e9f2df4f
LinuxLinux	Affected =5.1	Fixed in–

AI-suggested

A fix is available and has been applied in the Linux kernel. Users and administrators should update to the fixed kernel versions identified by commits 8879e3e0a84a86954c855caceead4867e74a9a27 and 5a5cfd8488c97e1b8939515429fe4c81e9f2df4f. No additional mitigation actions are required beyond applying the official patch.

Description

A vulnerability in the Linux kernel Bluetooth drivers btmtksdio and btmtkuart allows reading beyond the end of a received WMT event structure due to insufficient length validation before accessing struct fields. This flaw can cause improper memory access when processing short or malformed WMT events. The issue has been fixed by adding proper length validation and adjusting handling of short FUNC_CTRL events. The fix has been verified on several MediaTek chipsets without regression.

Impact

Improper length validation in Bluetooth drivers can lead to out-of-bounds memory reads, which may cause kernel crashes or undefined behavior. While no active exploitation is known, the vulnerability could potentially be leveraged to cause denial of service or other stability issues in affected Linux kernel versions.

Summary

The Linux kernel Bluetooth drivers btmtksdio.c and btmtkuart.c improperly cast received WMT events directly to struct btmtk_hci_wmt_evt and its FUNC_CTRL variant without validating the event length. This leads to out-of-bounds reads when firmware sends short or malformed WMT events, as the drivers read fields beyond the received data buffer. The patch mirrors the approach in btmtk.c by validating the base WMT header length using skb_pull_data() before accessing fields. Additionally, it handles short FUNC_CTRL events by decoding the result from the header's flag byte instead of reading a missing status word. The fix has been tested on MT7920, MT7921, MT7922, and MT7925 chipsets with no regressions.

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 11:53 UTC

Technical details

References

Community reviews

Related threats