CVE-2026-43257

Service interruption via unreleased ALSA DMA mapping

Published May 6, 2026 · Updated May 6, 2026

Resource leak in the Linux kernel cx88 ALSA driver allows local users to interrupt service by exhausting mapped DMA resources. snd_cx88_hw_params() maps an ALSA DMA buffer, but its cx88_risc_databuffer() failure branch exits without calling cx88_alsa_dma_unmap(). Reaching the flaw requires low-privileged local access to the affected cx88 audio path; repeated failures retain mappings and affect availability only.

CVSS severity5.5
Medium
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

Resource leak in the Linux kernel cx88 ALSA driver allows local users to interrupt service by exhausting mapped DMA resources. snd_cx88_hw_params() maps an ALSA DMA buffer, but its cx88_risc_databuffer() failure branch exits without calling cx88_alsa_dma_unmap(). Reaching the flaw requires low-privileged local access to the affected cx88 audio path; repeated failures retain mappings and affect availability only.

The record

CVE
CVE-2026-43257
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-772, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=3.19
  2. Affected versionversion=b2c75abde0debfb824f72845c3ed77d4b66798a0 <10ab64f8efc2f479293dce929fde326c285fc96f
  3. Affected versionversion=b2c75abde0debfb824f72845c3ed77d4b66798a0 <1ce8c2a8f050a23240553c8bae628ac623f9dbc1
  4. Affected versionversion=b2c75abde0debfb824f72845c3ed77d4b66798a0 <24f3dabeb97bd0bec8c1c926c97e3eb6a8129225
  5. Affected versionversion=b2c75abde0debfb824f72845c3ed77d4b66798a0 <3baefeeb7b85e1e34eebef399ffa312be7179e30
  6. Affected versionversion=b2c75abde0debfb824f72845c3ed77d4b66798a0 <dbc527d980f7ba8559de38f8c1e4158c71a78915
  7. Affected versionversion=b2c75abde0debfb824f72845c3ed77d4b66798a0 <dc911fccc6e08ef46a66b2a42a764252b001ee3c
  8. Affected versionversion=b2c75abde0debfb824f72845c3ed77d4b66798a0 <e3fb15aadfc8643203bbdf97ace0396e4586fa64
  9. Affected versionversion=b2c75abde0debfb824f72845c3ed77d4b66798a0 <f0d7f735eba963742009b0706e19dd0bed91537a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.19; version=b2c75abde0debfb824f72845c3ed77d4b66798a0 <10ab64f8efc2f479293dce929fde326c285fc96f; version=b2c75abde0debfb824f72845c3ed77d4b66798a0 <1ce8c2a8f050a23240553c8bae628ac623f9dbc1; version=b2c75abde0debfb824f72845c3ed77d4b66798a0 <24f3dabeb97bd0bec8c1c926c97e3eb6a8129225; version=b2c75abde0debfb824f72845c3ed77d4b66798a0 <3baefeeb7b85e1e34eebef399ffa312be7179e30; version=b2c75abde0debfb824f72845c3ed77d4b66798a0 <dbc527d980f7ba8559de38f8c1e4158c71a78915; version=b2c75abde0debfb824f72845c3ed77d4b66798a0 <dc911fccc6e08ef46a66b2a42a764252b001ee3c; version=b2c75abde0debfb824f72845c3ed77d4b66798a0 <e3fb15aadfc8643203bbdf97ace0396e4586fa64; version=b2c75abde0debfb824f72845c3ed77d4b66798a0 <f0d7f735eba963742009b0706e19dd0bed91537a

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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-772Missing Release of Resource after Effective Lifetime
T1499.004Application or System Exploitation

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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