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PUBLISHED

CVE-2024-26698

hv_netvsc: Fix race condition between netvsc_probe and netvsc_remove

Reserved:2024-02-19
Published:2024-04-03
Updated:2024-04-03

Description

In the Linux kernel, the following vulnerability has been resolved: hv_netvsc: Fix race condition between netvsc_probe and netvsc_remove In commit ac5047671758 ("hv_netvsc: Disable NAPI before closing the VMBus channel"), napi_disable was getting called for all channels, including all subchannels without confirming if they are enabled or not. This caused hv_netvsc getting hung at napi_disable, when netvsc_probe() has finished running but nvdev->subchan_work has not started yet. netvsc_subchan_work() -> rndis_set_subchannel() has not created the sub-channels and because of that netvsc_sc_open() is not running. netvsc_remove() calls cancel_work_sync(&nvdev->subchan_work), for which netvsc_subchan_work did not run. netif_napi_add() sets the bit NAPI_STATE_SCHED because it ensures NAPI cannot be scheduled. Then netvsc_sc_open() -> napi_enable will clear the NAPIF_STATE_SCHED bit, so it can be scheduled. napi_disable() does the opposite. Now during netvsc_device_remove(), when napi_disable is called for those subchannels, napi_disable gets stuck on infinite msleep. This fix addresses this problem by ensuring that napi_disable() is not getting called for non-enabled NAPI struct. But netif_napi_del() is still necessary for these non-enabled NAPI struct for cleanup purpose. Call trace: [ 654.559417] task:modprobe state:D stack: 0 pid: 2321 ppid: 1091 flags:0x00004002 [ 654.568030] Call Trace: [ 654.571221] <TASK> [ 654.573790] __schedule+0x2d6/0x960 [ 654.577733] schedule+0x69/0xf0 [ 654.581214] schedule_timeout+0x87/0x140 [ 654.585463] ? __bpf_trace_tick_stop+0x20/0x20 [ 654.590291] msleep+0x2d/0x40 [ 654.593625] napi_disable+0x2b/0x80 [ 654.597437] netvsc_device_remove+0x8a/0x1f0 [hv_netvsc] [ 654.603935] rndis_filter_device_remove+0x194/0x1c0 [hv_netvsc] [ 654.611101] ? do_wait_intr+0xb0/0xb0 [ 654.615753] netvsc_remove+0x7c/0x120 [hv_netvsc] [ 654.621675] vmbus_remove+0x27/0x40 [hv_vmbus]

Product status

Default status
unaffected

ac5047671758 before 9ec807e7b6f5
affected

ac5047671758 before 7656372ae190
affected

ac5047671758 before 48a8ccccffba
affected

ac5047671758 before 22a77c0f5b82
affected

ac5047671758 before 0e8875de9dad
affected

ac5047671758 before e0526ec5360a
affected

Default status
affected

5.8
affected

Any version before 5.8
unaffected

5.10.210
unaffected

5.15.149
unaffected

6.1.79
unaffected

6.6.18
unaffected

6.7.6
unaffected

6.8
unaffected

References

https://git.kernel.org/stable/c/9ec807e7b6f5fcf9499f3baa69f254bb239a847f

https://git.kernel.org/stable/c/7656372ae190e54e8c8cf1039725a5ea59fdf84a

https://git.kernel.org/stable/c/48a8ccccffbae10c91d31fc872db5c31aba07518

https://git.kernel.org/stable/c/22a77c0f5b8233237731df3288d067af51a2fd7b

https://git.kernel.org/stable/c/0e8875de9dad12805ff66e92cd5edea6a421f1cd

https://git.kernel.org/stable/c/e0526ec5360a48ad3ab2e26e802b0532302a7e11

cve.org CVE-2024-26698

nvd.nist.gov CVE-2024-26698

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