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NVD / CVE Program· CNA Linux

CVE-2025-40275: ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd

—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4, 2762d3ea9c929ca4094541ca517c317ffa94625b, 57f607c112966c21240c424b33e2cb71e121dcf0; azl3 kernel 6.6.112.1-2 on Azure Linux 3.0 6.6.117.1-1.

Low priority for now. Upgrade to Linux Linux 23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4, 2762d3ea9c929ca4094541ca517c317ffa94625b, 57f607c112966c21240c424b33e2cb71e121dcf0; azl3 kernel 6.6.112.1-2 on Azure Linux 3.0 6.6.117.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd In snd_usb_create_streams(), for UAC version 3 devices, the Interface Association Descriptor (IAD) is retrieved via usb_ifnum_to_if(). If this call fails, a fallback routine attempts to obtain the IAD from the next interface and sets a BADD profile. However, snd_usb_mixer_controls_badd() assumes that the IAD retrieved from usb_ifnum_to_if() is always valid, without performing a NULL check. This can lead to a NULL pointer dereference when usb_ifnum_to_if() fails to find the interface descriptor. This patch adds a NULL pointer check after calling usb_ifnum_to_if() in snd_usb_mixer_controls_badd() to prevent the dereference. This issue was discovered by syzkaller, which triggered the bug by sending a crafted USB device descriptor.

Published
Dec 6, 2025
Updated
Oct 15, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.18affected
    • 17156f23e93c0f59e06dd2aaffd06221341caaee and later · before 23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4affected · git
    • 17156f23e93c0f59e06dd2aaffd06221341caaee and later · before c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6affected · git
    • 17156f23e93c0f59e06dd2aaffd06221341caaee and later · before 9f282104627be5fbded3102ff9004f753c55a063affected · git
    • 17156f23e93c0f59e06dd2aaffd06221341caaee and later · before 2762d3ea9c929ca4094541ca517c317ffa94625baffected · git
    • 17156f23e93c0f59e06dd2aaffd06221341caaee and later · before 57f607c112966c21240c424b33e2cb71e121dcf0affected · git
    • 17156f23e93c0f59e06dd2aaffd06221341caaee and later · before cbdbfc756f2990942138ed0138da9303b4dbf9ffaffected · git
    • 17156f23e93c0f59e06dd2aaffd06221341caaee and later · before 85568535893600024d7d8794f4f8b6428b521e0caffected · git
    • 17156f23e93c0f59e06dd2aaffd06221341caaee and later · before 632108ec072ad64c8c83db6e16a7efee29ebfb74affected · git
    • before 4.18not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.159-16.1.159-1
Debian:13linuxbefore 6.12.63-16.12.63-1
Debian:14linuxbefore 6.17.9-16.17.9-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-40272Dec 6, 2025 · mm/secretmem: fix use-after-free race in fault handler
    31Monitor
  • ← EarlierCVE-2025-40273Dec 6, 2025 · NFSD: free copynotify stateid in nfs4_free_ol_stateid()
    35Monitor
  • Later →CVE-2025-40276Dec 6, 2025 · drm/panthor: Flush shmem writes before mapping buffers CPU-uncached
    29Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4Vendor (CNA)
Linux Linux2762d3ea9c929ca4094541ca517c317ffa94625bVendor (CNA)
Linux Linux57f607c112966c21240c424b33e2cb71e121dcf0Vendor (CNA)
Linux Linux632108ec072ad64c8c83db6e16a7efee29ebfb74Vendor (CNA)
Linux Linux85568535893600024d7d8794f4f8b6428b521e0cVendor (CNA)
Linux Linux9f282104627be5fbded3102ff9004f753c55a063Vendor (CNA)
Linux Linuxc5c08965ab96b16361e69a1e2a0e89dbcb99b5a6Vendor (CNA)
Linux Linuxcbdbfc756f2990942138ed0138da9303b4dbf9ffVendor (CNA)
azl3 kernel 6.6.112.1-2 on Azure Linux 3.06.6.117.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.159-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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