CVE-2024-50296: net: hns3: fix kernel crash when uninstalling driver
First published: Tue Nov 19 2024(Updated: )
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] pci_iov_remove_virtfn+0xb4/0x12c [15278.162485][T50670] sriov_disable+0x50/0x11c [15278.166829][T50670] pci_disable_sriov+0x24/0x30 [15278.171433][T50670] hnae3_unregister_ae_algo_prepare+0x60/0x90 [hnae3] [15278.178039][T50670] hclge_exit+0x28/0xd0 [hclge] [15278.182730][T50670] __se_sys_delete_module.isra.0+0x164/0x230 [15278.188550][T50670] __arm64_sys_delete_module+0x1c/0x30 [15278.193848][T50670] invoke_syscall+0x50/0x11c [15278.198278][T50670] el0_svc_common.constprop.0+0x158/0x164 [15278.203837][T50670] do_el0_svc+0x34/0xcc [15278.207834][T50670] el0_svc+0x20/0x30 For details, see the following figure. rmmod hclge disable VFs ---------------------------------------------------- hclge_exit() sriov_numvfs_store() ... device_lock() pci_disable_sriov() hns3_pci_sriov_configure() pci_disable_sriov() sriov_disable() sriov_disable() if !num_VFs : if !num_VFs : return; return; sriov_del_vfs() sriov_del_vfs() ... ... klist_put() klist_put() ... ... num_VFs = 0; num_VFs = 0; device_unlock(); In this patch, when driver is removing, we get the device_lock() to protect num_VFs, just like sriov_numvfs_store().
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=4.19.214<4.19.324 | |
| Linux Kernel | >=5.4.156<5.4.286 | |
| Linux Kernel | >=5.10.76<5.10.230 | |
| Linux Kernel | >=5.14.15<5.15 | |
| Linux Kernel | >=5.15<5.15.172 | |
| Linux Kernel | >=5.16<6.1.117 | |
| Linux Kernel | >=6.2<6.6.61 | |
| Linux Kernel | >=6.7<6.11.8 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| Linux Kernel | =6.12-rc3 | |
| Linux Kernel | =6.12-rc4 | |
| Linux Kernel | =6.12-rc5 | |
| Linux Kernel | =6.12-rc6 | |
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/a0df055775f30850c0da8f7dab40d67c0fd63908
- https://git.kernel.org/stable/c/7ae4e56de7dbd0999578246a536cf52a63f4056d
- https://git.kernel.org/stable/c/590a4b2d4e0b73586e88bce9b8135b593355ec09
- https://git.kernel.org/stable/c/e36482b222e00cc7aeeea772fc0cf2943590bc4d
- https://git.kernel.org/stable/c/76b155e14d9b182ce83d32ada2d0d7219ea8c8dd
- https://git.kernel.org/stable/c/719edd9f3372ce7fb3b157647c6658672946874b
- https://git.kernel.org/stable/c/b5c94e4d947d15d521e935ff10c5a22a7883dea5
- https://git.kernel.org/stable/c/df3dff8ab6d79edc942464999d06fbaedf8cdd18
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50296
- https://nvd.nist.gov/vuln/detail/CVE-2024-50296
- https://launchpad.net/bugs/cve/CVE-2024-50296
- https://security-tracker.debian.org/tracker/CVE-2024-50296
- https://ubuntu.com/security/CVE-2024-50296
- https://git.kernel.org/linus/df3dff8ab6d79edc942464999d06fbaedf8cdd18
Frequently Asked Questions
What is the severity of CVE-2024-50296?
CVE-2024-50296 has a high severity due to the potential for a kernel crash when uninstalling the driver.
How do I fix CVE-2024-50296?
To fix CVE-2024-50296, update the Linux kernel to a version that includes the patch for this vulnerability.
Which versions of the Linux kernel are affected by CVE-2024-50296?
CVE-2024-50296 affects various versions of the Linux kernel including those from 4.19.x to 6.12.x.
What type of systems are vulnerable to CVE-2024-50296?
Systems running affected versions of the Linux kernel with the hns3 driver are vulnerable to CVE-2024-50296.
Is there a workaround for CVE-2024-50296?
A temporary workaround for CVE-2024-50296 is to avoid uninstalling the driver while disabling the VF.
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