CVE-2021-47475

In the Linux kernel, the following vulnerability has been resolved: comedi: vmk80xx: fix transfer-buffer overflows The driver uses endpoint-sized USB transfer buffers but up until recently had no sanity checks on the sizes. Commit e1f13c879a7c ("staging: comedi: check validity of wMaxPacketSize of usb endpoints found") inadvertently fixed NULL-pointer dereferences when accessing the transfer buffers in case a malicious device has a zero wMaxPacketSize. Make sure to allocate buffers large enough to handle also the other accesses that are done without a size check (e.g. byte 18 in vmk80xx_cnt_insn_read() for the VMK8061_MODEL) to avoid writing beyond the buffers, for example, when doing descriptor fuzzing. The original driver was for a low-speed device with 8-byte buffers. Support was later added for a device that uses bulk transfers and is presumably a full-speed device with a maximum 64-byte wMaxPacketSize.

• linux linux kernel (>= 2.6.31 < 4.4.292) • linux linux kernel (>= 4.5 < 4.9.290) • linux linux kernel (>= 4.10 < 4.14.255) • linux linux kernel (>= 4.15 < 4.19.217) • linux linux kernel (>= 4.20 < 5.4.159) • linux linux kernel (>= 5.5 < 5.10.79) • linux linux kernel (>= 5.11 < 5.14.18) • linux linux kernel (>= 5.15 < 5.15.2)