VulnerabilityPublished 8 May 2026Updated 6 Nov 2026

CVE-2026-43436: Linux kernel · ALSA: usb-audio: Check endpoint numbers at parsing Scarlett2 mixer interfaces

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in df1d8abf36ca3681c21a6809eaa9a1e01ef897a6 : 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 df1d8abf36ca3681c21a6809eaa9a1e01ef897a6, c5c5a6c53cf3b658f1d4512dfa61f3cd25bc34ba, b267255c15d2a5b90c4e926146aa155e5161e264 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 8 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 ≥ 6c0a2078134aba6a77291554035304df9e16b85c, < df1d8abf36ca3681c21a6809eaa9a1e01ef897a6	Fixed in df1d8abf36ca3681c21a6809eaa9a1e01ef897a6
LinuxLinux	Affected ≥ 6c0a2078134aba6a77291554035304df9e16b85c, < c5c5a6c53cf3b658f1d4512dfa61f3cd25bc34ba	Fixed in c5c5a6c53cf3b658f1d4512dfa61f3cd25bc34ba
LinuxLinux	Affected ≥ 6c0a2078134aba6a77291554035304df9e16b85c, < b267255c15d2a5b90c4e926146aa155e5161e264	Fixed in b267255c15d2a5b90c4e926146aa155e5161e264
LinuxLinux	Affected ≥ 6c0a2078134aba6a77291554035304df9e16b85c, < b014cc945baba75816cda0cf8934be87c9ed4947	Fixed in b014cc945baba75816cda0cf8934be87c9ed4947
LinuxLinux	Affected ≥ 6c0a2078134aba6a77291554035304df9e16b85c, < 3d542cf3c4c854cdf5d58049771f68926b9eb2b9	Fixed in 3d542cf3c4c854cdf5d58049771f68926b9eb2b9
LinuxLinux	Affected ≥ 6c0a2078134aba6a77291554035304df9e16b85c, < 3d4f23885e4b90347c9a1d779af6e79a99b5172a	Fixed in 3d4f23885e4b90347c9a1d779af6e79a99b5172a

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Check endpoint numbers at parsing Scarlett2 mixer interfaces The Scarlett2 mixer quirk in USB-audio driver may hit a NULL dereference when a malformed USB descriptor is passed, since it assumes the presence of an endpoint in the parsed interface in scarlett2_find_fc_interface(), as reported by fuzzer. For avoiding the NULL dereference, just add the sanity check of bNumEndpoints and skip the invalid interface.

References

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