CVE-2026-31581

Kernel memory corruption via premature card teardown

Published Apr 24, 2026 · Updated Apr 24, 2026

Use-after-free in the Linux kernel ALSA 6fire USB driver allows local users to corrupt kernel memory by disconnecting a device. The usb6fire_chip_abort function frees the sound card and its embedded chip synchronously when no handles are open, then writes NULL through chip->card into freed slab memory. Triggering requires the ALSA 6fire driver, a bound USB audio device, a disconnect, and no open card handles; the public record does not establish a specific resulting crash or reliable code execution.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel ALSA 6fire USB driver allows local users to corrupt kernel memory by disconnecting a device. The usb6fire_chip_abort function frees the sound card and its embedded chip synchronously when no handles are open, then writes NULL through chip->card into freed slab memory. Triggering requires the ALSA 6fire driver, a bound USB audio device, a disconnect, and no open card handles; the public record does not establish a specific resulting crash or reliable code execution.

The record

CVE
CVE-2026-31581
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3dc20d1981d6a67d8184498a5da272942dde1e65
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <51f6532790b74ffdd6970bc848358a2838c1c185
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <af75b486f7e883e3422ece23c8d727e6815144a0
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d21e8a2af4869b5890b34e081d5aeadc93e9cd5c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3dc20d1981d6a67d8184498a5da272942dde1e65; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <51f6532790b74ffdd6970bc848358a2838c1c185; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <af75b486f7e883e3422ece23c8d727e6815144a0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d21e8a2af4869b5890b34e081d5aeadc93e9cd5c

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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