VulnerabilityPublished 14 Feb 2026Updated 19 Oct 2026

CVE-2026-23146: Linux kernel · Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in ccc683f597ceb28deb966427ae948e5ac739a909 : patch Linux kernel soon.

Data as of 26 Oct 2026, 16:53 UTC

Severity

High

Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

EPSS

0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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, 2026-06-10.

Patch

Available – fixed in ccc683f597ceb28deb966427ae948e5ac739a909, b0a900939e7e4866d9b90e9112514b72c451e873, 937a573423ce5a96fdb1fd425dc6b8d8d4ab5779 +12

Exploitation evidence

Disclosed: evidence found.
CVE published 14 Feb 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 >=5.10.237 <5.10.249 >=5.15.181 <5.15.199 >=6.1.135 <6.1.162 >=6.6.88 <6.6.123 >=6.12.24 <6.12.69 >=5.4.293 <5.5 >=6.13.12 <6.14 >=6.14.3 <6.15	Fixed in ccc683f597ceb28deb966427ae948e5ac739a909 b0a900939e7e4866d9b90e9112514b72c451e873 937a573423ce5a96fdb1fd425dc6b8d8d4ab5779 186d147cf7689ba1f9b3ddb753ab634a84940cc9 53e54cb31e667fca05b1808b990eac0807d1dab0 6.15 6.14 6.12.69 6.6.123 6.1.162 5.15.199 5.10.249 5.5 03e8c90c62233382042b7bd0fa8b8900552fdb62 0c3cd7a0b862c37acbee6d9502107146cc944398
LinuxLinux	Affected =6.15	Fixed in–

AI-suggested

A fix is available and has been applied in Linux kernel versions 6.15, 6.14, 6.12.69, 6.6.123, 6.1.162, and others as listed. Users and administrators should upgrade to these fixed versions to remediate the issue.

Description

A race condition in the Linux kernel Bluetooth hci_uart driver can cause a null pointer dereference in hci_uart_write_work. This occurs when a TTY write wakeup schedules work before the private data structure hu->priv is initialized, leading to a potential kernel crash.

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') (opens in a new tab)
Class weaknessLikelihood of exploit: MediumOWASP Top 10 A06:2025: Insecure Design (opens in a new tab)
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
Architecture and Design
In languages that support it, use synchronization primitives. Only wrap these around critical code to minimize the impact on performance.
Architecture and Design
Use thread-safe capabilities such as the data access abstraction in Spring.
Architecture and Design
Minimize the usage of shared resources in order to remove as much complexity as possible from the control flow and to reduce the likelihood of unexpected conditions occurring.
OWASP Cheat Sheets
Abuse Case (opens in a new tab)
Secure Design Principles (opens in a new tab)
OWASP ASVS 4.0.3
V1.11.2 (opens in a new tab)
Attack patterns
Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions (opens in a new tab)
Leveraging Race Conditions (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 15:46 UTC

WeaknessesCWE-362

Technical details

References

Community reviews

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