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CVE-2026-89736· NVD / CVE Program· CNA Linux

usb: gadget: u_audio: Fix use-after-free on sound card disconnect

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_audio: Fix use-after-free on sound card disconnect g_audio_cleanup() invokes snd_card_free_when_closed() to initiate sound card teardown and immediately frees the underlying struct snd_uac_chip context. However, snd_card_free_when_closed() returns asynchronously while ALSA control elements (kctls) remain open in userspace. When userspace control applications access or close these open file descriptors, kctl callbacks attempt to dereference kctl->private_data pointing to &uac->c_prm or &uac->p_prm within the freed uac structure, resulting in a use-after-free (UAF) memory corruption. Fix this issue by deferring the destruction of struct snd_uac_chip until all references to the ALSA sound card are released. Register a custom card->private_free callback (u_audio_card_free) during g_audio_setup() that frees uac and its associated playback/capture request and ring buffers only when the sound card reference count drops to zero.

HighCVSS 7.8 · v3.1—No exploit Fix available

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Published
Sep 11, 2026
Updated
Sep 14, 2026
EPSS
0.2% · 6th percentile
CWE
—
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Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

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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

    • 3e016ef2e72da93a2ea7afbb45de1b481b44d761, 3256e152b645fc1e788ba44c2d8ced690113e3e6, 0eda2004f38d95ef5715d62be884cd344260535b, 43ca70753dfffd517d2af126da28690f8f615605, 6.3affected
    • 33f341c1fc60e172a3515c51bdabee11e83d1ee9 and later · before a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82affected · git
    • b131989797f7287d7fdadb2bababc05a15d44750 and later · before f983793f03148b097977f200298db215cd2d4438affected · git
    • 3bc7324e4911351e39c54a62e6ca46321cb10faf and later · before 6f46762196f04464e1050a9ee94e72b917db9010affected · git
    • 6c67ed9ad9b83e453e808f9b31a931a20a25629b and later · before 891a8d11f4d5eb50b2ce7570f4f98204a7a57493affected · git
    • 6c67ed9ad9b83e453e808f9b31a931a20a25629b and later · before c74ff0b1a0fca53d3ac185873c87d6a719b30a47affected · git
    • 6c67ed9ad9b83e453e808f9b31a931a20a25629b and later · before 4e747c864a88537e18b1ffc19a1954c9686bb8e1affected · git
    • 6c67ed9ad9b83e453e808f9b31a931a20a25629b and later · before 79a92896e2bb9471550c56fc23d8d93592f04c27affected · git
    • 6c67ed9ad9b83e453e808f9b31a931a20a25629b and later · before 858965947081d10d41d9a1010a540d3d5eea958baffected · git
    • 5.10.177 and later · before 5.10.270affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxall versions—
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

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
  • CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
    40Plan
  • CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
    40Plan
  • CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index
    40Plan

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 Linux4.15Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux4e747c864a88537e18b1ffc19a1954c9686bb8e1Vendor (CNA)
Linux Linux5.10.270Vendor (CNA)
Linux Linux5.15.221Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux6.1.188Vendor (CNA)
Linux Linux6.3Vendor (CNA)
Linux Linux6f46762196f04464e1050a9ee94e72b917db9010Vendor (CNA)
Linux Linux79a92896e2bb9471550c56fc23d8d93592f04c27Vendor (CNA)
Linux Linux858965947081d10d41d9a1010a540d3d5eea958bVendor (CNA)
Linux Linux891a8d11f4d5eb50b2ce7570f4f98204a7a57493Vendor (CNA)
Linux Linuxa7ecd1a04f4f485d7be6443d0f0b2c61a800cb82Vendor (CNA)
Linux Linuxc74ff0b1a0fca53d3ac185873c87d6a719b30a47Vendor (CNA)
Linux Linuxf983793f03148b097977f200298db215cd2d4438Vendor (CNA)
debian:linux6.12.111-1 · Debian:13Package 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.

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Bug bounty scope

No known public program.

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

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

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CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

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

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

All records