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CVE-2026-23208

N/A Unknown

📋 TL;DR

A memory corruption vulnerability in the Linux kernel's ALSA USB audio subsystem allows an attacker to trigger an out-of-bounds write when sending specially crafted audio data. This affects systems using USB audio devices with the vulnerable kernel driver. The vulnerability could lead to system crashes or potential privilege escalation.

💻 Affected Systems

Products:
  • Linux kernel
Versions: Specific affected versions not specified in CVE; check kernel commit history for vulnerable versions before fixes.
Operating Systems: Linux distributions using vulnerable kernel versions
Default Config Vulnerable: ⚠️ Yes
Notes: Requires USB audio device usage; systems without USB audio or ALSA USB driver may not be affected.

⚠️ Manual Verification Required

This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.

Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).

🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.

Recommended Actions:
  1. Review the CVE details at NVD
  2. Check vendor security advisories for your specific version
  3. Test if the vulnerability is exploitable in your environment
  4. Consider updating to the latest version as a precaution

⚠️ Risk & Real-World Impact

🔴

Worst Case

Kernel panic, system crash, or potential privilege escalation leading to full system compromise.

🟠

Likely Case

System instability, audio playback issues, or denial of service through kernel crashes.

🟢

If Mitigated

No impact if patched; unpatched systems remain vulnerable to crashes or potential exploitation.

🌐 Internet-Facing: LOW - Requires local access or USB audio device interaction; not directly network exploitable.
🏢 Internal Only: MEDIUM - Local users or processes with audio device access could trigger the vulnerability.

🎯 Exploit Status

Public PoC: ✅ No
Weaponized: UNKNOWN
Unauthenticated Exploit: ✅ No
Complexity: MEDIUM

Exploitation requires local access and ability to send crafted audio data to USB audio devices.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Kernel versions with commits 62932d9ed639a9fa71b4ac1a56766a4b43abb7e4 or ef5749ef8b307bf8717945701b1b79d036af0a15

Vendor Advisory: https://git.kernel.org/stable/c/62932d9ed639a9fa71b4ac1a56766a4b43abb7e4

Restart Required: Yes

Instructions:

1. Update Linux kernel to version containing the fix. 2. Check with your distribution for security updates. 3. Reboot system after kernel update.

🔧 Temporary Workarounds

Disable USB audio devices

Linux

Prevent usage of vulnerable USB audio driver by disabling or removing USB audio devices.

sudo modprobe -r snd-usb-audio
echo 'blacklist snd-usb-audio' | sudo tee /etc/modprobe.d/blacklist-usb-audio.conf

🧯 If You Can't Patch

  • Restrict local user access to systems with USB audio devices.
  • Monitor system logs for kernel panic or crash events related to USB audio.

🔍 How to Verify

Check if Vulnerable:

Check kernel version and if USB audio module is loaded: lsmod | grep snd-usb-audio

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version includes fix commits: git log --oneline | grep -E '62932d9ed639|ef5749ef8b30'

📡 Detection & Monitoring

Log Indicators:

  • Kernel panic messages
  • KASAN error reports in dmesg
  • USB audio driver crash logs

Network Indicators:

  • None - local vulnerability

SIEM Query:

source="kernel" AND ("KASAN" OR "slab-out-of-bounds" OR "USB audio")

📊 Metadata

CVE ID: CVE-2026-23208
CVSS v3 Score: N/A (Unknown)
Published: February 14, 2026
Last Updated: February 18, 2026

🔗 References

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