CVSS 5.5 · Medium EPSS 0,12%
Kerentanan NULL Pointer Dereference pada linux kernel. Skor CVSS 3.1 5.5 (Medium) menurut NVD.
In the Linux kernel, the following vulnerability has been resolved: usbip: vudc: fix NULL deref in vep_dequeue() vep_alloc_request() wasn't initializing vrequest->udc, so cancellations on the FunctionFS AIO path were arriving in vep_dequeue without a valid UDC reference. Since vrequest->udc is never actually properly used anywhere, we opt to remove it, and update vep_dequeue to obtain a reference to the udc with ep_to_vudc(), consistent with the other vep_ ops. AFAICT this bug has existed for ~10 years. Seems that nobody has really stressed the FunctionFS AIO path on usbip's vudc. I tested this fix in a QEMU aarch64 guest driving FunctionFS endpoints via AIO. Before the fix, running `usbip attach` from the host would cause the guest to oops with the following backtrace: Call trace: vep_dequeue+0x1c/0xe4 (P) usb_ep_dequeue+0x14/0x20 ffs_aio_cancel+0x24/0x34 __arm64_sys_io_cancel+0xb0/0x124 do_el0_svc+0x68/0x100 el0_svc+0x18/0x5c el0t_64_sync_handler+0x98/0xdc el0t_64_sync+0x154/0x158
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Versi 4.7 hingga sebelum 5.10.261 |
| linux | linux kernel | Versi 5.11 hingga sebelum 5.15.212 |
| linux | linux kernel | Versi 5.16 hingga sebelum 6.1.178 |
| linux | linux kernel | Versi 6.2 hingga sebelum 6.6.145 |
| linux | linux kernel | Versi 6.7 hingga sebelum 6.12.96 |
| linux | linux kernel | Versi 6.13 hingga sebelum 6.18.39 |
| linux | linux kernel | Versi 6.19 hingga sebelum 7.1.4 |
| linux | linux kernel | Versi 7.2 rc1 |
| linux | linux kernel | Versi 7.2 rc2 |