VulnerabilityPublished 25 Sep 2026Updated 21 Oct 2026

CVE-2026-97908: Linux kernel · Bluetooth: btqcomsmd: destroy RPMsg endpoints before freeing hci_dev

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f5a427b16e45210dee656b0860728f3d496dee85 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:18 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f5a427b16e45210dee656b0860728f3d496dee85, aaa7f676418e1eb2c4ef0d4e4b07812b25e7b404, 962dcc1d8a52e64428cae07806e7f6b8d3ec6ac0 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Sep 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 to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 5052de8deff5619a9b7071f00084fd0264b58e17, < f5a427b16e45210dee656b0860728f3d496dee85	Fixed in f5a427b16e45210dee656b0860728f3d496dee85
LinuxLinux	Affected ≥ 5052de8deff5619a9b7071f00084fd0264b58e17, < aaa7f676418e1eb2c4ef0d4e4b07812b25e7b404	Fixed in aaa7f676418e1eb2c4ef0d4e4b07812b25e7b404
LinuxLinux	Affected ≥ 5052de8deff5619a9b7071f00084fd0264b58e17, < 962dcc1d8a52e64428cae07806e7f6b8d3ec6ac0	Fixed in 962dcc1d8a52e64428cae07806e7f6b8d3ec6ac0
LinuxLinux	Affected ≥ 5052de8deff5619a9b7071f00084fd0264b58e17, < 2dcc2240b4e5f6e5dce1736f82666aba40eb3b13	Fixed in 2dcc2240b4e5f6e5dce1736f82666aba40eb3b13
LinuxLinux	Affected ≥ 5052de8deff5619a9b7071f00084fd0264b58e17, < 2d016208a011558f211ec9687889df8318654730	Fixed in 2d016208a011558f211ec9687889df8318654730
LinuxLinux	Affected =4.12	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btqcomsmd: destroy RPMsg endpoints before freeing hci_dev The command and ACL RPMsg endpoints store struct btqcomsmd as their callback private data. The receive callbacks dereference btq->hdev without taking an hci_dev reference. The current teardown order frees the hci_dev before destroying the RPMsg endpoints in both the hci_register_dev() error path and the driver remove path. If WCNSS delivers data in that window, the endpoint callback can run with an already freed hci_dev and pass it to the Bluetooth core. For qcom_smd endpoints, rpmsg_destroy_ept() closes the channel and clears the callback under the channel recv_lock. The receive path holds the same lock while invoking the callback, so destroying the endpoints first both prevents new callbacks and serializes with any callback already running. Destroy the command and ACL endpoints before hci_free_dev(). Keep hci_unregister_dev() first during remove so the HCI core stops issuing operations before the transport endpoints are shut down. In the full registration-error cleanup path, return directly after freeing the hci_dev to avoid falling through to the partial-construction labels and destroying the endpoints twice.

References

Community reviews

Loading reviews…