VulnerabilityPublished 22 Aug 2025Updated 5 Nov 2026

CVE-2025-38641: Linux kernel · Bluetooth: btusb: Fix potential NULL dereference on kmalloc failure

Affects Linux kernelSource CVE Database V5

Not known to be exploited : upgrade to b505902c66a282dcb01bcdc015aa1fdfaaa075db or 5029d80bfc30b60ff57c70ccb04e027acb404f6a when convenient.

Data as of 5 Nov 2026, 21:34 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, 2026-11-05.

Patch

Available – fixed in b505902c66a282dcb01bcdc015aa1fdfaaa075db, 5029d80bfc30b60ff57c70ccb04e027acb404f6a

Exploitation evidence

Disclosed: evidence found.
CVE published 22 Aug 2025
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 5 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 Linux kernel to b505902c66a282dcb01bcdc015aa1fdfaaa075db or 5029d80bfc30b60ff57c70ccb04e027acb404f6a.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 7d70989fcea7f79afe018a7e34d3486406c7a94e, < b505902c66a282dcb01bcdc015aa1fdfaaa075db	Fixed in b505902c66a282dcb01bcdc015aa1fdfaaa075db
LinuxLinux	Affected ≥ 7d70989fcea7f79afe018a7e34d3486406c7a94e, < 5029d80bfc30b60ff57c70ccb04e027acb404f6a	Fixed in 5029d80bfc30b60ff57c70ccb04e027acb404f6a
LinuxLinux	Affected =6.16	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btusb: Fix potential NULL dereference on kmalloc failure Avoid potential NULL pointer dereference by checking the return value of kmalloc and handling allocation failure properly.

References

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