Debian: CVE-2024-50146: linux -- security update

Debian: CVE-2024-50146: linux -- security update

Severity

5

CVSS

(AV:L/AC:L/Au:S/C:N/I:N/A:C)

Published

11/07/2024

Created

01/14/2025

Added

01/13/2025

Modified

01/30/2025

Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Don't call cleanup on profile rollback failure When profile rollback fails in mlx5e_netdev_change_profile, the netdev profile var is left set to NULL. Avoid a crash when unloading the driver by not calling profile->cleanup in such a case. This was encountered while testing, with the original trigger that the wq rescuer thread creation got interrupted (presumably due to Ctrl+C-ing modprobe), which gets converted to ENOMEM (-12) by mlx5e_priv_init, the profile rollback also fails for the same reason (signal still active) so the profile is left as NULL, leading to a crash later in _mlx5e_remove. [732.473932] mlx5_core 0000:08:00.1: E-Switch: Unload vfs: mode(OFFLOADS), nvfs(2), necvfs(0), active vports(2) [734.525513] workqueue: Failed to create a rescuer kthread for wq "mlx5e": -EINTR [734.557372] mlx5_core 0000:08:00.1: mlx5e_netdev_init_profile:6235:(pid 6086): mlx5e_priv_init failed, err=-12 [734.559187] mlx5_core 0000:08:00.1 eth3: mlx5e_netdev_change_profile: new profile init failed, -12 [734.560153] workqueue: Failed to create a rescuer kthread for wq "mlx5e": -EINTR [734.589378] mlx5_core 0000:08:00.1: mlx5e_netdev_init_profile:6235:(pid 6086): mlx5e_priv_init failed, err=-12 [734.591136] mlx5_core 0000:08:00.1 eth3: mlx5e_netdev_change_profile: failed to rollback to orig profile, -12 [745.537492] BUG: kernel NULL pointer dereference, address: 0000000000000008 [745.538222] #PF: supervisor read access in kernel mode <snipped> [745.551290] Call Trace: [745.551590]<TASK> [745.551866]? __die+0x20/0x60 [745.552218]? page_fault_oops+0x150/0x400 [745.555307]? exc_page_fault+0x79/0x240 [745.555729]? asm_exc_page_fault+0x22/0x30 [745.556166]? mlx5e_remove+0x6b/0xb0 [mlx5_core] [745.556698]auxiliary_bus_remove+0x18/0x30 [745.557134]device_release_driver_internal+0x1df/0x240 [745.557654]bus_remove_device+0xd7/0x140 [745.558075]device_del+0x15b/0x3c0 [745.558456]mlx5_rescan_drivers_locked.part.0+0xb1/0x2f0 [mlx5_core] [745.559112]mlx5_unregister_device+0x34/0x50 [mlx5_core] [745.559686]mlx5_uninit_one+0x46/0xf0 [mlx5_core] [745.560203]remove_one+0x4e/0xd0 [mlx5_core] [745.560694]pci_device_remove+0x39/0xa0 [745.561112]device_release_driver_internal+0x1df/0x240 [745.561631]driver_detach+0x47/0x90 [745.562022]bus_remove_driver+0x84/0x100 [745.562444]pci_unregister_driver+0x3b/0x90 [745.562890]mlx5_cleanup+0xc/0x1b [mlx5_core] [745.563415]__x64_sys_delete_module+0x14d/0x2f0 [745.563886]? kmem_cache_free+0x1b0/0x460 [745.564313]? lockdep_hardirqs_on_prepare+0xe2/0x190 [745.564825]do_syscall_64+0x6d/0x140 [745.565223]entry_SYSCALL_64_after_hwframe+0x4b/0x53 [745.565725] RIP: 0033:0x7f1579b1288b

Solution(s)

• debian-upgrade-linux

References

• https://attackerkb.com/topics/cve-2024-50146
• CVE - 2024-50146