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CVE-2026-43279 Linux CVE debrief

A Linux kernel vulnerability (CVE-2026-43279) was found in the ALSA usb-audio component. The vulnerability is due to a lack of sanity check for out-of-bounds (OOB) writes at silencing. An attacker with local access could potentially exploit this vulnerability to cause a kernel crash. The vulnerability has been addressed with a sanity check added at prepare_silent_urb() to prevent OOB writes.

Vendor
Linux
Product
Unknown
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-06
Original CVE updated
2026-10-19
Advisory published
2026-05-06
Advisory updated
2026-10-19

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems should assess exposure and apply patches or updates as necessary. Linux kernel developers should review and apply patches. Linux distribution maintainers should update packages. Users of Linux-based systems should ensure they have updated packages.

Why it matters

CVE-2026-43279 is a Linux kernel vulnerability in the ALSA usb-audio component that could cause a kernel crash. Linux kernel developers, maintainers, and users should assess exposure and apply patches or updates as necessary.

  • Local attackers may cause a kernel crash
  • Linux kernel developers should review and apply patches
  • Linux distribution maintainers should update packages
  • Users of Linux-based systems should ensure they have updated packages

Technical summary

The Linux kernel vulnerability (CVE-2026-43279) is caused by a lack of sanity check for out-of-bounds (OOB) writes at silencing in the ALSA usb-audio component. An attacker with local access could potentially exploit this vulnerability to cause a kernel crash. The vulnerability has been addressed with a sanity check added at prepare_silent_urb() to prevent OOB writes. This fix was made to address the out-of-bounds write issue in the ALSA usb-audio component. The vulnerability was found to be caused by a lack of sanity check for out-of-bounds (OOB) writes at silencing.

Defensive priority

Medium

Recommended defensive actions

  • Review Linux kernel versions and apply patches as necessary
  • Monitor Linux kernel updates for potential vulnerabilities
  • Implement additional security measures to prevent local exploitation
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE record and source item provide details about the vulnerability and its fix. The Linux kernel has addressed the vulnerability with a sanity check at prepare_silent_urb() to prevent OOB writes. This fix was made to address the out-of-bounds write issue in the ALSA usb-audio component. The vulnerability was found to be caused by a lack of sanity check for out-of-bounds (OOB) writes at silencing. Linux kernel developers, maintainers, and users should assess exposure and apply patches or updates as necessary. The fix involves a new

Sources and references

Verified primary and authoritative sources

  • CVE-2026-43279 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-43279

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-43279 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-43279

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • ALSA: usb-audio: Add sanity check for OOB writes at silencing

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/43xxx/CVE-2026-43279.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/fa01973bb79d70c4736b6a4b2de99fbb2cbc8d1f

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/780dc57794a217b49994fa1d0b42465fb10a00aa

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/8995fc0e00b3fee9bf7ecb3d836b635b730c1049

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/fc9e5af60dc199051dc202ae78e1fe76a9977a5e

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/6af16f1b8649df4c00d6ced924bdd8b72c885b6a

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/ccaf9296763be4f76b59e2cac377006016c34435

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/fba2105a157fffcf19825e4eea498346738c9948

    Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.