CVE-2022-48817

MEDIUM EPSS 18.4%
Published Jul 16, 20241y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jul 16, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: net: dsa: ar9331: register the mdiobus under devres As explained in commits: 74b6d7d13307 ("net: dsa: realtek: register the MDIO bus under devres") 5135e96a3dd2 ("net: dsa: don't allocate the slave_mii_bus using devres") mdiobus_free() will panic when called from devm_mdiobus_free() <- devres_release_all() <- __device_release_driver(), and that mdiobus was not previously unregistered. The ar9331 is an MDIO device, so the initial set of constraints that I thought would cause this (I2C or SPI buses which call ->remove on ->shutdown) do not apply. But there is one more which applies here. If the DSA master itself is on a bus that calls ->remove from ->shutdown (like dpaa2-eth, which is on the fsl-mc bus), there is a device link between the switch and the DSA master, and device_links_unbind_consumers() will unbind the ar9331 switch driver on shutdown. So the same treatment must be applied to all DSA switch drivers, which is: either use devres for both the mdiobus allocation and registration, or don't use devres at all. The ar9331 driver doesn't have a complex code structure for mdiobus removal, so just replace of_mdiobus_register with the devres variant in order to be all-devres and ensure that we don't free a still-registered bus.

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
18.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 6

VendorProductVersionRange
linuxlinux_kernel*≥5.9  –  <5.10.101
linuxlinux_kernel*≥5.11  –  <5.15.24
linuxlinux_kernel*≥5.16  –  <5.16.10
linuxlinux_kernel5.17any
linuxlinux_kernel5.17any
linuxlinux_kernel5.17any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/475ce5dcf2d88fd4f3c213a0ac944e3e40702970
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/50facd86e9fbc4b93fe02e5fe05776047f45dbfb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/aae1c6a1d3d696fc33b609fb12fe744a556d1dc5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f1842a8cb71de4d7eb75a86f76e88c7ee739218c
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/475ce5dcf2d88fd4f3c213a0ac944e3e40702970
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/50facd86e9fbc4b93fe02e5fe05776047f45dbfb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/aae1c6a1d3d696fc33b609fb12fe744a556d1dc5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f1842a8cb71de4d7eb75a86f76e88c7ee739218c
    Patch