VulnerabilityPublished 24 Jun 2026Updated 6 Nov 2026

CVE-2026-53073: Linux kernel · Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f4b69c35813c432973d340d3600c01de106ed474 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:49 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in f4b69c35813c432973d340d3600c01de106ed474, ed4033fb85ccaaf6c3983be3c7b037e48253d232, ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07 +13

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 6 Nov 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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 >=5.10.237 <5.10.258 >=5.15.181 <5.15.209 >=6.1.135 <6.1.175 >=6.6.88 <6.6.141 >=6.12.24 <6.12.91 >=5.4.293 <5.5 >=6.13.12 <6.14 >=6.14.3 <6.15	Fixed in f4b69c35813c432973d340d3600c01de106ed474 ed4033fb85ccaaf6c3983be3c7b037e48253d232 ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07 a673cf6c4ac702cb79ac1f4d7fc4de763a6a3e40 356dee1bcac4d0d9152390561fa63331ebff211b 194f029a4d7f739e44ebc1f473120187b4de5104 68d39ea5e0adc9ecaea1ce8abd842ec972eb8718 6.15 6.14 6.12.91 6.6.141 6.1.175 5.15.209 5.10.258 5.5 3daa5818e473ed60eb69d8b5c71b651909d28c5a
LinuxLinux	Affected =6.15	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error When hci_register_dev() fails in hci_uart_register_dev() HCI_UART_PROTO_INIT is not cleared before calling hu->proto->close(hu) and setting hu->hdev to NULL. This means incoming UART data will reach the protocol-specific recv handler in hci_uart_tty_receive() after resources are freed. Clear HCI_UART_PROTO_INIT with a write lock before calling hu->proto->close() and setting hu->hdev to NULL. The write lock ensures all active readers have completed and no new reader can enter the protocol recv path before resources are freed. This allows the protocol-specific recv functions to remove the "HCI_UART_REGISTERED" guard without risking a null pointer dereference if hci_register_dev() fails.

References

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