VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98734: Linux kernel · Bluetooth: hci_core: Serialize SCO and ISO scheduling with teardown

Source GCVE Database

Authoritative record:CVE-2026-98734· High

Not known to be exploited · fixed in f997e03e2ef58aa7114828c9d924e515a9a1db9c : patch Linux kernel soon.

Data as of 26 Oct 2026, 17:16 UTC

Severity

High

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 f997e03e2ef58aa7114828c9d924e515a9a1db9c, ecdb1c66d8e14e63731c52d6fbcfa604064913c4, 101825c09ad6b7daa6cf4c9e6b1720b13de15596 +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-4q25-9c2v-7w4q

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ bf4c63252490ba78fb833cc7acf1a5b1900c970f, < f997e03e2ef58aa7114828c9d924e515a9a1db9c	Fixed in f997e03e2ef58aa7114828c9d924e515a9a1db9c
LinuxLinux	Affected ≥ bf4c63252490ba78fb833cc7acf1a5b1900c970f, < ecdb1c66d8e14e63731c52d6fbcfa604064913c4	Fixed in ecdb1c66d8e14e63731c52d6fbcfa604064913c4
LinuxLinux	Affected ≥ bf4c63252490ba78fb833cc7acf1a5b1900c970f, < 101825c09ad6b7daa6cf4c9e6b1720b13de15596	Fixed in 101825c09ad6b7daa6cf4c9e6b1720b13de15596
LinuxLinux	Affected ≥ bf4c63252490ba78fb833cc7acf1a5b1900c970f, < 1681f97afdf92e8557f2f3118ddc898471b5d299	Fixed in 1681f97afdf92e8557f2f3118ddc898471b5d299
LinuxLinux	Affected ≥ bf4c63252490ba78fb833cc7acf1a5b1900c970f, < 848a7a91c7f03675d3bd8db6f7721cbf9cb50e21	Fixed in 848a7a91c7f03675d3bd8db6f7721cbf9cb50e21
LinuxLinux	Affected =3.3	Fixed in–

AI-suggested

A fix for this vulnerability has been implemented in the Linux kernel by serializing SCO and ISO scheduling with connection teardown using the hci_dev_lock() mutex. Users should update to the fixed Linux kernel version once available.

Description

A use-after-free vulnerability in the Linux kernel's Bluetooth hci_core component was resolved. The flaw involved improper serialization of SCO and ISO scheduling with connection teardown, leading to potential access of freed memory. The issue was fixed by holding a device lock across connection selection and transmission, preventing concurrent access after connection removal.

References

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