CVE-2022-1048
📋 TL;DR
A use-after-free vulnerability in the Linux kernel's sound subsystem allows local attackers to trigger race conditions in ALSA PCM ioctl operations. This can lead to system crashes or potential privilege escalation. Affects Linux systems with sound capabilities where local users have access to sound devices.
💻 Affected Systems
- Linux kernel
📦 What is this software?
Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to root, allowing complete system compromise and persistence.
Likely Case
Kernel panic or system crash causing denial of service.
If Mitigated
Limited impact if sound subsystem is disabled or access controls restrict local user privileges.
🎯 Exploit Status
Exploit requires local access and knowledge of sound subsystem. Race condition exploitation adds complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Varies by distribution - check specific vendor advisories
Vendor Advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2066706
Restart Required: Yes
Instructions:
1. Check your distribution's security advisory. 2. Update kernel package via package manager. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable sound subsystem
linuxRemove or blacklist sound modules to prevent exploitation
echo 'blacklist snd' >> /etc/modprobe.d/blacklist-sound.conf
reboot
Restrict sound device access
linuxUse filesystem permissions to limit access to sound devices
chmod 600 /dev/snd/*
chown root:root /dev/snd/*
🧯 If You Can't Patch
- Implement strict access controls to limit local user privileges
- Monitor for suspicious sound subsystem activity and kernel crashes
🔍 How to Verify
Check if Vulnerable:
Check kernel version against distribution security advisory. Example: uname -rCheck Version:
uname -rVerify Fix Applied:
Verify kernel version after update matches patched version in advisory📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages
- System crashes/reboots
- Unusual sound subsystem activity
Network Indicators:
- None - local exploit only
SIEM Query:
source="kernel" AND ("Oops" OR "general protection fault" OR "use-after-free")🔗 References
- https://bugzilla.redhat.com/show_bug.cgi?id=2066706
- https://lore.kernel.org/lkml/20220322170720.3529-5-tiwai%40suse.de/T/#m1d3b791b815556012c6be92f1c4a7086b854f7f3
- https://security.netapp.com/advisory/ntap-20220629-0001/
- https://www.debian.org/security/2022/dsa-5127
- https://www.debian.org/security/2022/dsa-5173
- https://bugzilla.redhat.com/show_bug.cgi?id=2066706
- https://lore.kernel.org/lkml/20220322170720.3529-5-tiwai%40suse.de/T/#m1d3b791b815556012c6be92f1c4a7086b854f7f3
- https://security.netapp.com/advisory/ntap-20220629-0001/
- https://www.debian.org/security/2022/dsa-5127
- https://www.debian.org/security/2022/dsa-5173
