VulnerabilityPublished 18 Oct 2026

CVE-2026-98458: Linux kernel · Bluetooth: ISO: release unused CIS holds after channel attach

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in ed4c026cc4094dfb7a329b9d8df0ddd0be1b2458 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Low

Rated Low by Threat Radar's AI analysis · 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.
Patch: Available – fixed in ed4c026cc4094dfb7a329b9d8df0ddd0be1b2458, e5fcca51177f224604e3a8c926ffd5edbeb58b09, e0e8b70207eaf27aee0a05ec5bf2d1b6bcb004d1 +1

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.

What to do

Upgrade Linux kernel to ed4c026cc4094dfb7a329b9d8df0ddd0be1b2458, e5fcca51177f224604e3a8c926ffd5edbeb58b09, e0e8b70207eaf27aee0a05ec5bf2d1b6bcb004d1 or 0fcd4dad555c96e0bd3a1b8c569f989be85c7341.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 69997d50ec574be816b4ee8f9cee52ebbd53f8bd, < ed4c026cc4094dfb7a329b9d8df0ddd0be1b2458	Fixed in ed4c026cc4094dfb7a329b9d8df0ddd0be1b2458
LinuxLinux	Affected ≥ 69997d50ec574be816b4ee8f9cee52ebbd53f8bd, < e5fcca51177f224604e3a8c926ffd5edbeb58b09	Fixed in e5fcca51177f224604e3a8c926ffd5edbeb58b09
LinuxLinux	Affected ≥ 69997d50ec574be816b4ee8f9cee52ebbd53f8bd, < e0e8b70207eaf27aee0a05ec5bf2d1b6bcb004d1	Fixed in e0e8b70207eaf27aee0a05ec5bf2d1b6bcb004d1
LinuxLinux	Affected ≥ 69997d50ec574be816b4ee8f9cee52ebbd53f8bd, < 0fcd4dad555c96e0bd3a1b8c569f989be85c7341	Fixed in 0fcd4dad555c96e0bd3a1b8c569f989be85c7341
LinuxLinux	Affected =6.6	Fixed in–

AI-suggested

A fix has been applied in the Linux kernel as indicated by the presence of fixed commits. Users should update to the fixed Linux kernel versions containing the referenced commits to remediate this issue.

Description

A vulnerability in the Linux kernel Bluetooth ISO layer was fixed by ensuring unused connection holds are properly released after channel attachment attempts. The issue involved improper handling of connection holds when a channel association was not created, potentially leading to resource mismanagement.

Impact

The vulnerability could lead to resource mismanagement in the Bluetooth ISO layer of the Linux kernel due to unreleased connection holds. This may affect system stability or resource availability related to Bluetooth ISO connections. No direct exploit or active exploitation is reported.

Summary

The Linux kernel Bluetooth ISO layer functions hci_bind_cis() and hci_connect_cis() return a connection hold for the ISO layer. When a new channel association is created, this hold is consumed and later released by iso_conn_free(). However, in cases where iso_chan_add() does not create an association—either because the socket is already attached to the same iso_conn or another socket is attached—the hold returned for the call remains unused. This can happen when deferred setup calls iso_connect_cis() again for an existing socket or when another socket tries to reuse the CIS. The fix detects the idempotent case while the connection is locked and releases the unused hold after iso_chan_add(), also releasing it on -EBUSY errors, preventing resource leaks. Other errors do not drop the hold, as newly allocated iso_conn objects release the hold when their last temporary reference is dropped.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 11:06 UTC

Technical details

References

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