Bug 2507276 (CVE-2026-64485)

Summary: CVE-2026-64485 kernel: ALSA: compress: Fix task creation error unwind
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Advanced Linux Sound Architecture (ALSA) compress module. The `snd_compr_task_new()` function, responsible for creating driver tasks, does not properly handle errors during the validation of Direct Memory Access (DMA) buffers or file descriptor reservation. This oversight can lead to a resource leak, where driver resources allocated during task creation are not freed. Consequently, this could result in system instability or a Denial of Service (DoS) over time due to resource exhaustion.
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Description OSIDB Bzimport 2026-07-25 10:14:06 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ALSA: compress: Fix task creation error unwind

snd_compr_task_new() allocates the driver task before validating the
returned DMA buffers and reserving file descriptors. When either of
those later steps fails, the core frees its task wrapper and DMA-buffer
references without calling the driver's task_free() callback. Any
driver resources allocated by task_create() are therefore leaked.

The dual-fd allocation path also jumps to cleanup without storing the
negative get_unused_fd_flags() result in retval. Since retval still
contains the successful task_create() return value, TASK_CREATE can
incorrectly report success although the task was discarded.

Preserve the fd allocation errors and call task_free() when failure
occurs after a successful task_create() callback.
Comment 1 TEJ RATHI 2026-07-27 05:46:16 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026072549-CVE-2026-64485-1bf9@gregkh/T