CVE-2024-50296

MEDIUM EPSS 16.6%
Published Nov 19, 20241y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
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Published Nov 19, 2024 1y ago
Last Modified Jun 17, 2026 1w ago

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] 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().

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
16.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 14

VendorProductVersionRange
linuxlinux_kernel*≥4.19.214  –  <4.19.324
linuxlinux_kernel*≥5.4.156  –  <5.4.286
linuxlinux_kernel*≥5.10.76  –  <5.10.230
linuxlinux_kernel*≥5.14.15  –  <5.15
linuxlinux_kernel*≥5.15  –  <5.15.172
linuxlinux_kernel*≥5.16  –  <6.1.117
linuxlinux_kernel*≥6.2  –  <6.6.61
linuxlinux_kernel*≥6.7  –  <6.11.8
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any

References 10

  • git.kernel.org https://git.kernel.org/stable/c/590a4b2d4e0b73586e88bce9b8135b593355ec09
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/719edd9f3372ce7fb3b157647c6658672946874b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/76b155e14d9b182ce83d32ada2d0d7219ea8c8dd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7ae4e56de7dbd0999578246a536cf52a63f4056d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a0df055775f30850c0da8f7dab40d67c0fd63908
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b5c94e4d947d15d521e935ff10c5a22a7883dea5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/df3dff8ab6d79edc942464999d06fbaedf8cdd18
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e36482b222e00cc7aeeea772fc0cf2943590bc4d
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/590a4b2d4e0b73586e88bce9b8135b593355ec09
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/719edd9f3372ce7fb3b157647c6658672946874b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/76b155e14d9b182ce83d32ada2d0d7219ea8c8dd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7ae4e56de7dbd0999578246a536cf52a63f4056d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a0df055775f30850c0da8f7dab40d67c0fd63908
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b5c94e4d947d15d521e935ff10c5a22a7883dea5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/df3dff8ab6d79edc942464999d06fbaedf8cdd18
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e36482b222e00cc7aeeea772fc0cf2943590bc4d
    Patch