high CVSS 7.1 EPSS <0.1%

CVE-2022-48701·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix an out-of-bounds bug in __snd_usb_parse_audio_interface() There may be a bad USB audio device with a USB ID of (0x04fa, 0x4201) and the number of it's interfaces less than 4, an out-of-bounds read bug occurs when parsing the interface descriptor for this device. Fix this by checking the number of interfaces.

Severity
high
Software
Kernel
Fixed in
5.19.9
Published

How likely is exploitation

FIRST's Exploit Prediction Scoring System puts the probability of this CVE being exploited in the next 30 days at <0.1% — in the bottom 1% of all published CVEs. EPSS is an independent forecast of exploitation, not a severity rating: it says nothing about how much damage a successful attack does, which is what a CVSS score measures.

Read the two together. CVE-2022-48701 scores 7.1 on CVSS, so a successful attack would be serious — but at <0.1%, almost nobody is currently attempting it. That is a different situation from a flaw under mass exploitation, and it is usually the difference between patching on your next maintenance window and patching tonight.

Affected versions

From: 5.16

Until: 5.19.9

Fixed in: 5.19.9

How to fix this CVE

Update your Linux kernel to version 5.19.9 or later to patch an out-of-bounds memory read vulnerability in USB audio device parsing. Systems running kernel versions 5.16 through 5.19.8 should prioritize this update immediately, as malformed USB audio devices can trigger kernel memory access violations. Reboot your system after applying the kernel update to ensure the patched version is active.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Run 'uname -r' to check your current kernel version and confirm if it falls within the vulnerable range (5.16 to 5.19.8)
  2. Execute 'lsusb' to identify all connected USB devices and note any audio devices with vendor ID 04fa and product ID 4201
  3. Check kernel logs for USB parsing errors with 'dmesg | grep -i "usb\|audio\|bounds"' to see if exploitation attempts or parsing failures have occurred
  4. After patching, verify the new kernel version with 'uname -r' and confirm it is 5.19.9 or later

FAQ

What is CVE-2022-48701?

This vulnerability affects the Linux kernel's USB audio interface parsing logic, where a specially crafted or malfunctioning USB audio device with fewer interfaces than expected can cause an out-of-bounds memory read when the kernel attempts to validate interface descriptors.

Is CVE-2022-48701 being actively exploited?

No, this CVE is not listed in CISA's Known Exploited Vulnerabilities catalog and no public exploits are currently available.

What versions of Kernel are affected by CVE-2022-48701?

Linux kernel versions 5.16 through 5.19.8 are vulnerable; kernel 5.19.9 and later versions contain the fix.

How do I check if my server is vulnerable to CVE-2022-48701?

Run 'uname -r' to obtain your kernel version; if the output shows a version between 5.16 and 5.19.8 (inclusive), your system is vulnerable.

Does Defensia detect CVE-2022-48701?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If the Linux kernel is installed on a monitored server, CVE-2022-48701 will appear in your dashboard with remediation steps.

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References

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