PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-64485 Linux CVE debrief

A vulnerability in the Linux kernel's ALSA compress component can lead to resource leaks and incorrect task creation reporting when error handling fails during task creation. This issue arises because the task wrapper and DMA-buffer references are freed without calling the driver's task_free() callback when later steps in snd_compr_task_new() fail after task creation. Additionally, the dual-fd allocation path does not properly store and handle errors from get_unused_fd_flags(), potentially causing TASK_CREATE to report success even though the task was discarded. To address this, preserve fd allocation errors and ensure task_free() is called on failure after a successful task_create() callback.

Vendor
Linux
Product
Unknown
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-25
Original CVE updated
2026-10-19
Advisory published
2026-07-25
Advisory updated
2026-10-19

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems, especially those using the ALSA compress component, should assess exposure and apply patches or mitigations as necessary.

Why it matters

This vulnerability in the Linux kernel's ALSA compress component can lead to resource leaks and incorrect task creation reporting. Linux kernel developers, maintainers, and users of Linux-based systems should assess exposure and apply patches.

  • Resource leaks due to uncalled task_free() callbacks can lead to memory exhaustion over time.
  • Incorrect task creation reporting can obscure error conditions, making debugging more difficult.
  • Exploitation could potentially lead to denial-of-service conditions due to resource depletion.

Technical summary

The vulnerability exists in the Linux kernel's ALSA compress component. Specifically, the snd_compr_task_new() function allocates a driver task before validating DMA buffers and reserving file descriptors. If later steps fail, the task wrapper and DMA-buffer references are freed without calling the driver's task_free() callback, leading to resource leaks. Additionally, the error handling for fd allocation does not properly store and handle errors, potentially causing incorrect success reporting for task creation.

Defensive priority

Medium

Recommended defensive actions

  • Review and apply the provided source code patches to ensure the vulnerability is addressed.
  • Verify the Linux kernel version and update to a version that includes the fix if necessary.
  • Monitor system logs for any indications of the vulnerability being exploited.
  • Perform a thorough review of system configurations and asset inventory to identify potential exposure.
  • Implement compensating controls for exposed systems while remediation is scheduled and verified.
  • Track exceptions and retest remediated assets to ensure the vulnerability is properly addressed.
  • Continuously monitor for signs of exploitation or anomalous behavior in system logs.

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description, affected versions, and references to source code changes. However, specific details about exploitation or victim impact are not provided, limiting the depth of the analysis.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-64485 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-64485

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

  • CVE-2026-64485 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-64485

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

Supplemental references

  • ALSA: compress: Fix task creation error unwind

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/64xxx/CVE-2026-64485.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/b27a75d42044d9d4709095617730b91b1c4af423

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/426a9947a38d272d0e19c031658da68e31128667

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/4a60127debb9e370d6c0e22a307326b624a141f3

    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.