VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98735: Linux kernel · Bluetooth: hci_core: Serialize ACL scheduling with channel deletion

Source GCVE Database

Authoritative record:CVE-2026-98735

Not known to be exploited · fixed in f4845ab191a4f686a5da481fbba90ed73bb693b0 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated by Threat Radar · 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 f4845ab191a4f686a5da481fbba90ed73bb693b0, 780affacd92977fd9b819bdc4f26a6832cb27fda, 86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd +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-h7jm-4xpc-fcgr

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 3eff45eaf81780dad25c167bbaafa7d25ae407da, < f4845ab191a4f686a5da481fbba90ed73bb693b0	Fixed in f4845ab191a4f686a5da481fbba90ed73bb693b0
LinuxLinux	Affected ≥ 3eff45eaf81780dad25c167bbaafa7d25ae407da, < 780affacd92977fd9b819bdc4f26a6832cb27fda	Fixed in 780affacd92977fd9b819bdc4f26a6832cb27fda
LinuxLinux	Affected ≥ 3eff45eaf81780dad25c167bbaafa7d25ae407da, < 86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd	Fixed in 86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd
LinuxLinux	Affected ≥ 3eff45eaf81780dad25c167bbaafa7d25ae407da, < 51f95ea451f25d7e3f048c0f438f04fa74688aae	Fixed in 51f95ea451f25d7e3f048c0f438f04fa74688aae
LinuxLinux	Affected ≥ 3eff45eaf81780dad25c167bbaafa7d25ae407da, < 4fda8f0abeea9929036446d89a476fb8298abcb0	Fixed in 4fda8f0abeea9929036446d89a476fb8298abcb0
LinuxLinux	Affected =3.3	Fixed in–

AI-suggested

A fix is available that serializes ACL scheduling with channel deletion by holding the device mutex during channel selection and transmission. This prevents use-after-free conditions. Users should apply the official Linux kernel updates that include this fix. Since this is a kernel vulnerability, updating to a patched kernel version is the recommended remediation.

Description

A use-after-free vulnerability in the Linux kernel Bluetooth subsystem (hci_core) was resolved. The issue arises because ACL scheduling and channel deletion are not properly serialized, allowing a channel to be freed while still in use. This leads to a use-after-free condition detected by KASAN. The fix involves holding a device mutex to serialize channel selection, transmission, and teardown, preventing concurrent access to freed channels.

References

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