CVE - CVE-2024-26698

CVE-ID
CVE-2024-26698	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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]
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/0e8875de9dad12805ff66e92cd5edea6a421f1cd URL:https://git.kernel.org/stable/c/0e8875de9dad12805ff66e92cd5edea6a421f1cd MISC:https://git.kernel.org/stable/c/22a77c0f5b8233237731df3288d067af51a2fd7b URL:https://git.kernel.org/stable/c/22a77c0f5b8233237731df3288d067af51a2fd7b MISC:https://git.kernel.org/stable/c/48a8ccccffbae10c91d31fc872db5c31aba07518 URL:https://git.kernel.org/stable/c/48a8ccccffbae10c91d31fc872db5c31aba07518 MISC:https://git.kernel.org/stable/c/7656372ae190e54e8c8cf1039725a5ea59fdf84a URL:https://git.kernel.org/stable/c/7656372ae190e54e8c8cf1039725a5ea59fdf84a MISC:https://git.kernel.org/stable/c/9ec807e7b6f5fcf9499f3baa69f254bb239a847f URL:https://git.kernel.org/stable/c/9ec807e7b6f5fcf9499f3baa69f254bb239a847f MISC:https://git.kernel.org/stable/c/e0526ec5360a48ad3ab2e26e802b0532302a7e11 URL:https://git.kernel.org/stable/c/e0526ec5360a48ad3ab2e26e802b0532302a7e11
Assigning CNA
kernel.org
Date Record Created
20240219	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240219)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
This is an record on the CVE List, which provides common identifiers for publicly known cybersecurity vulnerabilities.
Search CVE Using Keywords: You can also search by reference using the CVE Reference Maps.
For More Information: CVE Request Web Form (select "Other" from dropdown)