CVE-2026-31620

Summary

In the Linux kernel, the following vulnerability has been resolved:

ALSA: usx2y: us144mkii: fix NULL deref on missing interface 0

A malicious USB device with the TASCAM US-144MKII device id can have a configuration containing bInterfaceNumber=1 but no interface 0. USB configuration descriptors are not required to assign interface numbers sequentially, so usb_ifnum_to_if(dev, 0) returns will NULL, which will then be dereferenced directly.

Fix this up by checking the return value properly.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxdee1bcf28a3dd13ddb2e9200407864f73e9c4d63 < 09b145c1f1331c40dc955c0024d636f25417cddbaffected
LinuxLinuxdee1bcf28a3dd13ddb2e9200407864f73e9c4d63 < fbaf29ce00e7bce683f3faf4f2b326bd0a9e6602affected
LinuxLinuxdee1bcf28a3dd13ddb2e9200407864f73e9c4d63 < d04dd67ab10dc978c6c843c6bd6a2a66a9444f51affected
LinuxLinuxdee1bcf28a3dd13ddb2e9200407864f73e9c4d63 < 48bd344e1040b9f2eb512be73c13f5db83efc191affected
LinuxLinux6.18affected
LinuxLinux0 < 6.18unaffected
LinuxLinux6.18.24 <= 6.18.*unaffected
LinuxLinux6.19.14 <= 6.19.*unaffected
LinuxLinux7.0.1 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References