UBUNTU-CVE-2024-26698

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    UBUNTU-CVE-2024-26698

    Published: 3 Apr 2024Last Modified: 8 Oct 2026
    Upstream:
    CVE-2024-26698
    Aliases:
    USN-6766-1
    USN-6766-2
    USN-6766-3

    Summary:

    Details: 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: https://ubuntu.com/security/CVE-2024-26698, https://git.kernel.org/linus/e0526ec5360a48ad3ab2e26e802b0532302a7e11, 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, https://www.cve.org/CVERecord?id=CVE-2024-26698, https://ubuntu.com/security/notices/USN-6766-1, https://ubuntu.com/security/notices/USN-6766-2, https://ubuntu.com/security/notices/USN-6766-3, https://ubuntu.com/security/notices/USN-6795-1, https://ubuntu.com/security/notices/USN-6828-1, https://ubuntu.com/security/notices/USN-6895-1, https://ubuntu.com/security/notices/USN-6895-2, https://ubuntu.com/security/notices/USN-6900-1, https://ubuntu.com/security/notices/USN-6895-3, https://ubuntu.com/security/notices/USN-6895-4

    Affected packages

    Package

    Name: linux-hwe-edge

    Purl: pkg:deb/ubuntu/linux-hwe-edge?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    4.8.0-28.30~16.04.1
    4.8.0-30.32~16.04.1
    4.8.0-32.34~16.04.1
    4.8.0-34.36~16.04.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2024-26698 | CVE-DB