CVE-2025-37916 Information

Description

In the Linux kernel the following vulnerability has been resolved:

pds_core: remove write-after-free of client_id

A use-after-free error popped up in stress testing:

[Mon Apr 21 21:21:33 2025] BUG: KFENCE: use-after-free write in pdsc_auxbus_dev_del+0xef/0x160 [pds_core] [Mon Apr 21 21:21:33 2025] Use-after-free write at 0x000000007013ecd1 (in kfence-47): [Mon Apr 21 21:21:33 2025] pdsc_auxbus_dev_del+0xef/0x160 [pds_core] [Mon Apr 21 21:21:33 2025] pdsc_remove+0xc0/0x1b0 [pds_core] [Mon Apr 21 21:21:33 2025] pci_device_remove+0x24/0x70 [Mon Apr 21 21:21:33 2025] device_release_driver_internal+0x11f/0x180 [Mon Apr 21 21:21:33 2025] driver_detach+0x45/0x80 [Mon Apr 21 21:21:33 2025] bus_remove_driver+0x83/0xe0 [Mon Apr 21 21:21:33 2025] pci_unregister_driver+0x1a/0x80

The actual device uninit usually happens on a separate thread scheduled after this code runs but there is no guarantee of order of thread execution so this could be a problem. There’s no actual need to clear the client_id at this point so simply remove the offending code.

Reference

https://git.kernel.org/stable/c/26dc701021302f11c8350108321d11763bd81dfe https://git.kernel.org/stable/c/9b467c5bcdb45a41d2a49fbb9ffca73d1380e99b https://git.kernel.org/stable/c/c649b9653ed09196e91d3f4b16b679041b3c42e6 https://git.kernel.org/stable/c/dfd76010f8e821b66116dec3c7d90dd2403d1396