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NVD / CVE Program· CNA Linux

CVE-2025-39997: ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free

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 353d8c715cc951a980728133c9dd64ca5a0a186c, 6.1.175, 6.16.

Low priority for now. Upgrade to Linux Linux 353d8c715cc951a980728133c9dd64ca5a0a186c, 6.1.175, 6.16 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 race condition to UAF in snd_usbmidi_free The previous commit 0718a78f6a9f ("ALSA: usb-audio: Kill timer properly at removal") patched a UAF issue caused by the error timer. However, because the error timer kill added in this patch occurs after the endpoint delete, a race condition to UAF still occurs, albeit rarely. Additionally, since kill-cleanup for urb is also missing, freed memory can be accessed in interrupt context related to urb, which can cause UAF. Therefore, to prevent this, error timer and urb must be killed before freeing the heap memory.

—No exploit Fix available
Published
Oct 15, 2025
Updated
Oct 19, 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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  • 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 EPSS rises 20 points in a week

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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

    • 62066758d2ae169278e5d6aea5995b1b6f6ddeb5, 6.16affected
    • 06513dd6d32c37d0364db8488cfdf3e14da238a8 and later · before e63f049c7764b615d1d50cb486745fa63372b42daffected · git
    • efaf61052b8ff9ee8968912fbaf02c2847c78ede and later · before e16985513e89466a236d2a7c202783b4dd0c5a46affected · git
    • 647410a7da46067953a53c0d03f8680eff570959 and later · before dc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647baaffected · git
    • c611b9e55174e439dcd85a72969b43a95f3827a4 and later · before 647d6b8d22be12842fde6ed0c56859ebc615f21eaffected · git
    • 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 and later · before af600e7f5526d16146b3ae99f6ad57bfea79ca33affected · git
    • 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 and later · before 353d8c715cc951a980728133c9dd64ca5a0a186caffected · git
    • 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1 and later · before 9f2c0ac1423d5f267e7f1d1940780fc764b0fee3affected · git
    • 6.1.167 and later · before 6.1.175affected · semver
    • 6.15.3 and later · before 6.16affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:14linuxbefore 6.16.11-16.16.11-1
openSUSE:Tumbleweedkernel-sourcebefore 6.17.5-1.16.17.5-1.1
openSUSE:Tumbleweedkernel-source-longtermbefore 6.18.16-1.16.18.16-1.1

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-2025-39995Oct 15, 2025 · media: i2c: tc358743: Fix use-after-free bugs caused by orphan timer in probe
    0Monitor
  • ← EarlierCVE-2025-39996Oct 15, 2025 · media: b2c2: Fix use-after-free causing by irq_check_work in flexcop_pci_remove
    0Monitor
  • Later →CVE-2025-39998Oct 15, 2025 · scsi: target: target_core_configfs: Add length check to avoid buffer overflow
    28Monitor

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 Linux353d8c715cc951a980728133c9dd64ca5a0a186cVendor (CNA)
Linux Linux6.1.175Vendor (CNA)
Linux Linux6.16Vendor (CNA)
Linux Linux647d6b8d22be12842fde6ed0c56859ebc615f21eVendor (CNA)
Linux Linux9f2c0ac1423d5f267e7f1d1940780fc764b0fee3Vendor (CNA)
Linux Linuxaf600e7f5526d16146b3ae99f6ad57bfea79ca33Vendor (CNA)
Linux Linuxdc4874366cf6cf4a31d8fa4b7f0e2a5b2d7647baVendor (CNA)
Linux Linuxe16985513e89466a236d2a7c202783b4dd0c5a46Vendor (CNA)
Linux Linuxe63f049c7764b615d1d50cb486745fa63372b42dVendor (CNA)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)
opensuse:kernel-source6.17.5-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:kernel-source-longterm6.18.16-1.1 · openSUSE:TumbleweedPackage 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✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

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

All records