VulnerabilityPublished 26 May 2026Updated 6 Nov 2026

CVE-2026-45836: Linux kernel · Bluetooth: L2CAP: Fix null-ptr-deref in l2cap_sock_get_sndtimeo_cb()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in fd072f833147b0bc10c43a454624cb99d02f3fc7 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 15:49 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 fd072f833147b0bc10c43a454624cb99d02f3fc7, e1863e7480feddb90125d0dd5a1b572972d75908, cf1fd517f892ded88168df878f834b625133f86d +5

Exploitation evidence

Disclosed: evidence found.
CVE published 26 May 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 ≥ 8d836d71e2223b8961b21112bb4ce89ef8231682, < fd072f833147b0bc10c43a454624cb99d02f3fc7	Fixed in fd072f833147b0bc10c43a454624cb99d02f3fc7
LinuxLinux	Affected ≥ 8d836d71e2223b8961b21112bb4ce89ef8231682, < e1863e7480feddb90125d0dd5a1b572972d75908	Fixed in e1863e7480feddb90125d0dd5a1b572972d75908
LinuxLinux	Affected ≥ 8d836d71e2223b8961b21112bb4ce89ef8231682, < cf1fd517f892ded88168df878f834b625133f86d	Fixed in cf1fd517f892ded88168df878f834b625133f86d
LinuxLinux	Affected ≥ 8d836d71e2223b8961b21112bb4ce89ef8231682, < a93d66907dd4d29b65c9797a93784bf61906d6d6	Fixed in a93d66907dd4d29b65c9797a93784bf61906d6d6
LinuxLinux	Affected ≥ 8d836d71e2223b8961b21112bb4ce89ef8231682, < 78a88d43dab8d23aeef934ed8ce34d40e6b3d613	Fixed in 78a88d43dab8d23aeef934ed8ce34d40e6b3d613
LinuxLinux	Affected ≥ 8d836d71e2223b8961b21112bb4ce89ef8231682, < 58dc5e3d8768e121907608e6e196a908512fb083	Fixed in 58dc5e3d8768e121907608e6e196a908512fb083

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix null-ptr-deref in l2cap_sock_get_sndtimeo_cb() Add the same NULL guard already present in l2cap_sock_resume_cb() and l2cap_sock_ready_cb().

References

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