CVE-2025-22020: memstick: rtsx_usb_ms: Fix slab-use-after-free in rtsx_usb_ms_drv_remove
In the Linux kernel, the following vulnerability has been resolved:
memstick: rtsxusbms: Fix slab-use-after-free in rtsxusbmsdrvremove
This fixes the following crash:
================================================================== BUG: KASAN: slab-use-after-free in rtsxusbmspollcard+0x159/0x200 [rtsxusbms] Read of size 8 at addr ffff888136335380 by task kworker/6:0/140241
CPU: 6 UID: 0 PID: 140241 Comm: kworker/6:0 Kdump: loaded Tainted: G E 6.14.0-rc6+ #1 Tainted: [E]=UNSIGNEDMODULE Hardware name: LENOVO 30FNA1V7CW/1057, BIOS S0EKT54A 07/01/2024 Workqueue: events rtsxusbmspollcard [rtsxusbms] Call Trace: <TASK> dumpstacklvl+0x51/0x70 printaddressdescription.constprop.0+0x27/0x320 ? rtsxusbmspollcard+0x159/0x200 [rtsxusbms] printreport+0x3e/0x70 kasanreport+0xab/0xe0 ? rtsxusbmspollcard+0x159/0x200 [rtsxusbms] rtsxusbmspollcard+0x159/0x200 [rtsxusbms] ? pfxrtsxusbmspollcard+0x10/0x10 [rtsxusbms] ? pfxschedule+0x10/0x10 ? kickpool+0x3b/0x270 processonework+0x357/0x660 workerthread+0x390/0x4c0 ? pfxworkerthread+0x10/0x10 kthread+0x190/0x1d0 ? pfxkthread+0x10/0x10 retfromfork+0x2d/0x50 ? pfxkthread+0x10/0x10 retfromforkasm+0x1a/0x30 </TASK>
Allocated by task 161446: kasansavestack+0x20/0x40 kasansavetrack+0x10/0x30 kasankmalloc+0x7b/0x90 kmallocnoprof+0x1a7/0x470 memstickallochost+0x1f/0xe0 [memstick] rtsxusbmsdrvprobe+0x47/0x320 [rtsxusbms] platformprobe+0x60/0xe0 calldriverprobe+0x35/0x120 reallyprobe+0x123/0x410 driverprobedevice+0xc7/0x1e0 driverprobedevice+0x49/0xf0 deviceattachdriver+0xc6/0x160 busforeachdrv+0xe4/0x160 deviceattach+0x13a/0x2b0 busprobedevice+0xbd/0xd0 deviceadd+0x4a5/0x760 platformdeviceadd+0x189/0x370 mfdadddevice+0x587/0x5e0 mfdadddevices+0xb1/0x130 rtsxusbprobe+0x28e/0x2e0 [rtsxusb] usbprobeinterface+0x15c/0x460 calldriverprobe+0x35/0x120 reallyprobe+0x123/0x410 driverprobedevice+0xc7/0x1e0 driverprobedevice+0x49/0xf0 deviceattachdriver+0xc6/0x160 busforeachdrv+0xe4/0x160 deviceattach+0x13a/0x2b0 rebindmarkedinterfaces.isra.0+0xcc/0x110 usbresetdevice+0x352/0x410 usbdevdoioctl+0xe5c/0x1860 usbdevioctl+0xa/0x20 x64sysioctl+0xc5/0xf0 dosyscall64+0x59/0x170 entrySYSCALL64afterhwframe+0x76/0x7e
Freed by task 161506: kasansavestack+0x20/0x40 kasansavetrack+0x10/0x30 kasansavefreeinfo+0x36/0x60 kasanslabfree+0x34/0x50 kfree+0x1fd/0x3b0 devicerelease+0x56/0xf0 kobjectcleanup+0x73/0x1c0 rtsxusbmsdrvremove+0x13d/0x220 [rtsxusbms] platformremove+0x2f/0x50 devicereleasedriverinternal+0x24b/0x2e0 busremovedevice+0x124/0x1d0 devicedel+0x239/0x530 platformdevicedel.part.0+0x19/0xe0 platformdeviceunregister+0x1c/0x40 mfdremovedevicesfn+0x167/0x170 deviceforeachchildreverse+0xc9/0x130 mfdremovedevices+0x6e/0xa0 rtsxusbdisconnect+0x2e/0xd0 [rtsxusb] usbunbindinterface+0xf3/0x3f0 devicereleasedriverinternal+0x24b/0x2e0 procdisconnectclaim+0x13d/0x220 usbdevdoioctl+0xb5e/0x1860 usbdevioctl+0xa/0x20 x64sysioctl+0xc5/0xf0 dosyscall64+0x59/0x170 entrySYSCALL64afterhwframe+0x76/0x7e
Last potentially related work creation: kasansavestack+0x20/0x40 kasanrecordauxstack+0x85/0x90 insertwork+0x29/0x100 queuework+0x34a/0x540 calltimerfn+0x2a/0x160 expiretimers+0x5f/0x1f0 runtimerbase.part.0+0x1b6/0x1e0 runtimersoftirq+0x8b/0xe0 handlesoftirqs+0xf9/0x360 irqexitrcu+0x114/0x130 sysvecapictimerinterrupt+0x72/0x90 asmsysvecapictimerinterrupt+0x16/0x20
Second to last potentially related work creation: kasansavestack+0x20/0x40 kasanrecordauxstack+0x85/0x90 insertwork+0x29/0x100 queuework+0x34a/0x540 calltimerfn+0x2a/0x160 expiretimers+0x5f/0x1f0 runtimerbase.part.0+0x1b6/0x1e0 runtimersoftirq+0x8b/0xe0 handlesoftirqs+0xf9/0x ---truncated---
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-22020?
CVE-2025-22020 has been classified with a critical severity due to the potential for exploit leading to system crashes.
How do I fix CVE-2025-22020?
To fix CVE-2025-22020, users should update to the latest version of the Linux kernel where the vulnerability has been patched.
What types of systems are affected by CVE-2025-22020?
CVE-2025-22020 affects systems running Linux Kernel version 6.14.0-rc6 and later that utilize the memstick functionality.
What is the nature of the vulnerability in CVE-2025-22020?
CVE-2025-22020 is a slab-use-after-free vulnerability occurring in the rtsx_usb_ms driver.
Is there a public exploit available for CVE-2025-22020?
As of now, there are no known public exploits for CVE-2025-22020, but being proactive in applying patches is recommended.