CVE-2026-64480: Linux Kernel Use-After-Free Vulnerability

CVE-2026-64480 Overview

CVE-2026-64480 is a NULL pointer dereference vulnerability in the Linux kernel's Advanced Linux Sound Architecture (ALSA) ice1712 driver. The driver invokes snd_ctl_new1() in multiple locations without validating the return value before dereferencing the returned pointer. When memory allocation fails, snd_ctl_new1() returns NULL, causing a kernel NULL pointer dereference during sound control initialization. The affected code paths reside in ice1712.c, ice1724.c, and aureon.c. The upstream fix adds NULL checks after each call and returns -ENOMEM when allocation fails.

Critical Impact
A NULL pointer dereference in the ice1712 sound driver can trigger a kernel oops, resulting in denial of service on systems with affected Envy24-based sound hardware.

Affected Products

Linux kernel ALSA ice1712 driver (sound/pci/ice1712/ice1712.c)
Linux kernel ALSA ice1724 driver (sound/pci/ice1712/ice1724.c)
Linux kernel ALSA aureon driver (sound/pci/ice1712/aureon.c)

Discovery Timeline

2026-07-25 - CVE-2026-64480 published to NVD
2026-07-25 - Last updated in NVD database

Technical Details for CVE-2026-64480

Vulnerability Analysis

The vulnerability resides in the ice1712 family of ALSA drivers, which support ICEnsemble Envy24 series audio controllers. During driver initialization, the code registers multiple sound controls by calling snd_ctl_new1(), a helper that allocates a new snd_kcontrol structure from a template. This function can return NULL when the kernel slab allocator fails to satisfy the allocation request.

The affected driver code paths did not validate the returned pointer before passing it to subsequent operations. When memory pressure or allocation failure occurs, the kernel dereferences a NULL pointer while attempting to register or manipulate the control, producing a NULL pointer dereference in kernel context. The result is a kernel oops and potential system instability.

The fix, applied across six upstream commits including 2b929b9, 38a7cc4, 57d59be, 69bf1df, 71b8710, and d34ad48, inserts NULL checks after each snd_ctl_new1() call and returns -ENOMEM to propagate the failure cleanly.

Root Cause

The root cause is missing return-value validation for an allocation-based API. snd_ctl_new1() is documented to return NULL on allocation failure, but the ice1712, ice1724, and aureon drivers assumed success and immediately dereferenced the returned pointer.

Attack Vector

Exploitation requires local access to a system with an affected Envy24-based sound card and the ability to trigger driver initialization under memory pressure. The vulnerability is a reliability defect and cannot be triggered remotely. The primary impact is denial of service through a kernel oops. See the upstream commits listed in Kernel Git Commit 2b929b9 for the corrected control-registration flow.

Detection Methods for CVE-2026-64480

Indicators of Compromise

Kernel oops messages referencing snd_ctl_new1, snd_ctl_add, or functions within the snd-ice1712, snd-ice1724, or snd-aureon modules.
Repeated ALSA driver load failures accompanied by -ENOMEM return codes in dmesg.

Detection Strategies

Inventory Linux hosts and identify those running kernel versions predating the fixes listed in the Kernel Git Commit d34ad48 advisory.
Correlate kernel crash telemetry with modules snd_ice1712, snd_ice1724, and snd_aureon to identify systems experiencing the fault.

Monitoring Recommendations

Forward kernel.log and dmesg output to a centralized log platform and alert on kernel oops signatures containing ALSA control registration functions.
Monitor host uptime and unexpected reboots on workstations with Envy24-based audio hardware.
Track kernel package versions across the fleet to confirm patch adoption.

How to Mitigate CVE-2026-64480

Immediate Actions Required

Update the Linux kernel to a stable release that includes the ice1712 NULL-check fixes referenced in the upstream commits.
Reboot affected systems after applying the updated kernel package to ensure the patched driver is loaded.
Validate that vendor-supplied kernels from distributions such as Debian, Ubuntu, Red Hat, and SUSE have incorporated the backport.

Patch Information

The fix has been merged into the mainline and stable Linux kernel trees through commits 2b929b9, 38a7cc4, 57d59be, 69bf1df, 71b8710, and d34ad48. Each commit adds NULL validation after snd_ctl_new1() calls and returns -ENOMEM on allocation failure.

Workarounds

Blacklist the snd_ice1712, snd_ice1724, and snd_aureon kernel modules on systems that do not require Envy24-based audio support.
Prevent unprivileged module autoloading by restricting modprobe and disabling automatic driver binding for the affected PCI IDs until the kernel is patched.

bash

# Blacklist affected ALSA modules until the kernel can be updated
echo 'blacklist snd_ice1712' | sudo tee /etc/modprobe.d/blacklist-ice1712.conf
echo 'blacklist snd_ice1724' | sudo tee -a /etc/modprobe.d/blacklist-ice1712.conf
echo 'blacklist snd_aureon'  | sudo tee -a /etc/modprobe.d/blacklist-ice1712.conf
sudo update-initramfs -u