CVE-2024-50296

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: hns3: fix kernel crash when uninstalling driver

When the driver is uninstalled and the VF is disabled concurrently, a

kernel crash occurs. The reason is that the two actions call function

pci_disable_sriov(). The num_VFs is checked to determine whether to

release the corresponding resources. During the second calling, num_VFs

is not 0 and the resource release function is called. However, the

corresponding resource has been released during the first invoking.

Therefore, the problem occurs:

[15277.839633][T50670] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020

...

[15278.131557][T50670] Call trace:

[15278.134686][T50670] klist_put+0x28/0x12c

[15278.138682][T50670] klist_del+0x14/0x20

[15278.142592][T50670] device_del+0xbc/0x3c0

[15278.146676][T50670] pci_remove_bus_device+0x84/0x120

[15278.151714][T50670] pci_stop_and_remove_bus_device+0x6c/0x80

[15278.157447][T50670] pc

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References