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NVD / CVE Program· CNA Linux

CVE-2025-40085: ALSA: usb-audio: Fix NULL pointer deference in try_to_register_card

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: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 28412b489b088fb88dff488305fd4e56bd47f6e4, 5.15.196, 5.20; 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 28412b489b088fb88dff488305fd4e56bd47f6e4, 5.15.196, 5.20; 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 deference in try_to_register_card In try_to_register_card(), the return value of usb_ifnum_to_if() is passed directly to usb_interface_claimed() without a NULL check, which will lead to a NULL pointer dereference when creating an invalid USB audio device. Fix this by adding a check to ensure the interface pointer is valid before passing it to usb_interface_claimed().

—No exploit Fix available
Published
Oct 29, 2025
Updated
Oct 19, 2026
EPSS
0.2% · 10th 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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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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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

    • 9d4f4dc3cd38e412c29a7626489fe48b79ebbf6c, 52076a41c128146c9df4a157e972cb17019313b1, 6.1affected
    • 28787ff9fbeaf57684eb64cc33e2ec8ceedf21b5 and later · before 736159f7b296d7a95f7208eb4799639b1f8b16a0affected · git
    • 39efc9c8a973ddff5918191525d1679d0fb368ea and later · before 8d19a7ab28c7b9c207db5c5282afa8cc8595bcdbaffected · git
    • 39efc9c8a973ddff5918191525d1679d0fb368ea and later · before 576312eb436326b44b7010f4d9ae2b698df075eaaffected · git
    • 39efc9c8a973ddff5918191525d1679d0fb368ea and later · before bba7208765d26e5e36b87f21dacc2780b064f41faffected · git
    • 39efc9c8a973ddff5918191525d1679d0fb368ea and later · before 8503ac1a62075a085402e42a386b5c627c821a51affected · git
    • 39efc9c8a973ddff5918191525d1679d0fb368ea and later · before 28412b489b088fb88dff488305fd4e56bd47f6e4affected · git
    • 5.15.75 and later · before 5.15.196affected · semver
    • 5.19.17 and later · before 5.20affected · semver
    • 6.0.3 and later · before 6.1affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.158-16.1.158-1
Debian:13linuxbefore 6.12.57-16.12.57-1
Debian:14linuxbefore 6.17.6-16.17.6-1

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-2025-40083Oct 29, 2025 · net/sched: sch_qfq: Fix null-deref in agg_dequeue
    0Monitor
  • ← EarlierCVE-2025-40084Oct 29, 2025 · ksmbd: transport_ipc: validate payload size before reading handle
    28Monitor
  • Later →CVE-2025-40086Oct 30, 2025 · drm/xe: Don't allow evicting of BOs in same VM in array of VM binds
    0Monitor

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 Linux28412b489b088fb88dff488305fd4e56bd47f6e4Vendor (CNA)
Linux Linux5.15.196Vendor (CNA)
Linux Linux5.20Vendor (CNA)
Linux Linux576312eb436326b44b7010f4d9ae2b698df075eaVendor (CNA)
Linux Linux6.1Vendor (CNA)
Linux Linux736159f7b296d7a95f7208eb4799639b1f8b16a0Vendor (CNA)
Linux Linux8503ac1a62075a085402e42a386b5c627c821a51Vendor (CNA)
Linux Linux8d19a7ab28c7b9c207db5c5282afa8cc8595bcdbVendor (CNA)
Linux Linuxbba7208765d26e5e36b87f21dacc2780b064f41fVendor (CNA)
azl3 kernel 6.6.112.1-2 on Azure Linux 3.06.6.117.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.158-1 · 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.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

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.

Change log

  1. Fix✗ → ✓

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References

Show all references (5 more)

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

All records