CVE-2022-49300 (GCVE-0-2022-49300)
Vulnerability from cvelistv5
Published
2025-02-26 02:10
Modified
2026-05-11 18:57
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 5ea8d10802ec4c153a6e21eebaf412e2abd29736
Version: 5ea8d10802ec4c153a6e21eebaf412e2abd29736
Version: 5ea8d10802ec4c153a6e21eebaf412e2abd29736
Version: 5ea8d10802ec4c153a6e21eebaf412e2abd29736
Version: 5ea8d10802ec4c153a6e21eebaf412e2abd29736
Version: 5ea8d10802ec4c153a6e21eebaf412e2abd29736
Version: 5ea8d10802ec4c153a6e21eebaf412e2abd29736
Version: 5ea8d10802ec4c153a6e21eebaf412e2abd29736
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: fix race between nbd_alloc_config() and module removal\n\nWhen nbd module is being removing, nbd_alloc_config() may be\ncalled concurrently by nbd_genl_connect(), although try_module_get()\nwill return false, but nbd_alloc_config() doesn\u0027t handle it.\n\nThe race may lead to the leak of nbd_config and its related\nresources (e.g, recv_workq) and oops in nbd_read_stat() due\nto the unload of nbd module as shown below:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000040\n  Oops: 0000 [#1] SMP PTI\n  CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0+ #1\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\n  Workqueue: knbd16-recv recv_work [nbd]\n  RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd]\n  Call Trace:\n   recv_work+0x3b/0xb0 [nbd]\n   process_one_work+0x1ed/0x390\n   worker_thread+0x4a/0x3d0\n   kthread+0x12a/0x150\n   ret_from_fork+0x22/0x30\n\nFixing it by checking the return value of try_module_get()\nin nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV),\nassign nbd-\u003econfig only when nbd_alloc_config() succeeds to ensure\nthe value of nbd-\u003econfig is binary (valid or NULL).\n\nAlso adding a debug message to check the reference counter\nof nbd_config during module removal."
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