cbcvebase.
CVE-2022-49300
published 2025-02-26

CVE-2022-49300: In the Linux kernel, the following vulnerability has been resolved: nbd: fix race between nbd_alloc_config() and module removal When nbd module is being…

PriorityP415medium4.7CVSS 3.1
AVLACHPRLUINSUCNINAH
EPSS
0.19%
9.0th percentile
In the Linux kernel, the following vulnerability has been resolved: nbd: fix race between nbd_alloc_config() and module removal When nbd module is being removing, nbd_alloc_config() may be called concurrently by nbd_genl_connect(), although try_module_get() will return false, but nbd_alloc_config() doesn't handle it. The race may lead to the leak of nbd_config and its related resources (e.g, recv_workq) and oops in nbd_read_stat() due to the unload of nbd module as shown below: BUG: kernel NULL pointer dereference, address: 0000000000000040 Oops: 0000 [#1] SMP PTI CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Workqueue: knbd16-recv recv_work [nbd] RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd] Call Trace: recv_work+0x3b/0xb0 [nbd] process_one_work+0x1ed/0x390 worker_thread+0x4a/0x3d0 kthread+0x12a/0x150 ret_from_fork+0x22/0x30 Fixing it by checking the return value of try_module_get() in nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV), assign nbd->config only when nbd_alloc_config() succeeds to ensure the value of nbd->config is binary (valid or NULL). Also adding a debug message to check the reference counter of nbd_config during module removal.

Affected

21 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 5.18.5-1 (bookworm)linux 5.18.5-1 (bookworm)
linuxlinux——
linuxlinux>= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 165cf2e0019fa6cedc75b456490c41494c34abb4165cf2e0019fa6cedc75b456490c41494c34abb4
linuxlinux>= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 2573f2375b64280be977431701ed5d33b75b9ad02573f2375b64280be977431701ed5d33b75b9ad0
linuxlinux>= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 8a7da4ced236ce6637fe70f14ca18e718d4bf9e98a7da4ced236ce6637fe70f14ca18e718d4bf9e9
linuxlinux>= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 122e4adaff2439f1cc18cc7e931980fa7560df5c122e4adaff2439f1cc18cc7e931980fa7560df5c
linuxlinux>= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 71c142f910da44421213ade601bcbd23ceae19fa71c142f910da44421213ade601bcbd23ceae19fa
linuxlinux>= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 2888fa41985f93ed0a6837cfbb06bcbfd7fa23142888fa41985f93ed0a6837cfbb06bcbfd7fa2314
linuxlinux>= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < d09525720dd5201756f698bee1076de9aefd4602d09525720dd5201756f698bee1076de9aefd4602
linuxlinux>= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < c55b2b983b0fa012942c3eb16384b2b722caa810c55b2b983b0fa012942c3eb16384b2b722caa810
linuxlinux_kernel< 4.14.2834.14.283
linuxlinux_kernel>= 0 < 5.10.127-15.10.127-1
linuxlinux_kernel>= 0 < 5.18.5-15.18.5-1
linuxlinux_kernel>= 0 < 5.18.5-15.18.5-1
linuxlinux_kernel>= 0 < 5.18.5-15.18.5-1
linuxlinux_kernel>= 4.15 < 4.19.2474.19.247
linuxlinux_kernel>= 4.20 < 5.4.1985.4.198
linuxlinux_kernel>= 5.11 < 5.15.475.15.47
linuxlinux_kernel>= 5.16 < 5.17.155.17.15
linuxlinux_kernel>= 5.18 < 5.18.45.18.4
linuxlinux_kernel>= 5.5 < 5.10.1225.10.122

CVSS provenance

nvdv3.14.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
osv4.7MEDIUM
vendor_debian4.7MEDIUM
vendor_redhat4.7MEDIUM
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