VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98819: Linux kernel · Bluetooth: btintel: validate DDC record lengths

Source GCVE Database

Authoritative record:CVE-2026-98819

Not known to be exploited · fixed in f3617369fbb30a4d2e54841ab8e92ca4fa211e56 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f3617369fbb30a4d2e54841ab8e92ca4fa211e56, c9c15d4d8956df8c564f7c210e4dc5b9b820d97a, b0fce76873a5e6a6820354409b26693ac5f8b251 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 18 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.

ghsa-h69r-276q-7c65

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 145f2368c5fd7962e37315ccc092670743019d08, < f3617369fbb30a4d2e54841ab8e92ca4fa211e56	Fixed in f3617369fbb30a4d2e54841ab8e92ca4fa211e56
LinuxLinux	Affected ≥ 145f2368c5fd7962e37315ccc092670743019d08, < c9c15d4d8956df8c564f7c210e4dc5b9b820d97a	Fixed in c9c15d4d8956df8c564f7c210e4dc5b9b820d97a
LinuxLinux	Affected ≥ 145f2368c5fd7962e37315ccc092670743019d08, < b0fce76873a5e6a6820354409b26693ac5f8b251	Fixed in b0fce76873a5e6a6820354409b26693ac5f8b251
LinuxLinux	Affected ≥ 145f2368c5fd7962e37315ccc092670743019d08, < 069031f569f1681f17e863f48c221a6091b47850	Fixed in 069031f569f1681f17e863f48c221a6091b47850
LinuxLinux	Affected ≥ 145f2368c5fd7962e37315ccc092670743019d08, < 7df748aa9f9ecab514e5989ed89c9ba35b6e5574	Fixed in 7df748aa9f9ecab514e5989ed89c9ba35b6e5574
LinuxLinux	Affected =4.4	Fixed in–

AI-suggested

A fix has been applied to the Linux kernel to properly validate DDC record lengths and reject invalid records. Users should update to the fixed Linux kernel version containing this patch. No additional mitigation steps are indicated.

Description

A vulnerability in the Linux kernel Bluetooth subsystem (btintel) related to improper validation of Display Data Channel (DDC) record lengths has been resolved. The issue involved parsing DDC record lengths as unsigned values to prevent wrapping errors and rejecting invalid records that are too small, exceed maximum length, or surpass remaining firmware bytes. This vulnerability was reported by Claude Mythos and fixed in the Linux kernel.

Impact

Improper validation of DDC record lengths could lead to incorrect processing of Bluetooth firmware data, which might cause unexpected behavior or potential security issues in the Bluetooth subsystem of the Linux kernel. The exact impact is not detailed, and no known exploits in the wild have been reported.

Summary

The Linux kernel Bluetooth component btintel had a vulnerability in handling DDC record lengths. The flaw was due to parsing DDC record lengths in a way that allowed 0xFF to wrap, potentially causing improper processing of records. The fix involved validating that records are at least three bytes long (the mandatory header size), do not exceed the maximum unsigned 8-bit value (U8_MAX), and do not exceed the remaining firmware bytes before calling Intel_Write_DDC. This validation prevents malformed or malicious DDC records from being processed incorrectly.

References

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