CVE-2022-48813

published 2024-07-16

CVE-2022-48813: In the Linux kernel, the following vulnerability has been resolved: net: dsa: felix: don't use devres for mdiobus As explained in commits: 74b6d7d13307 ("net…

Priority P4 21 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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

net: dsa: felix: don't use devres for mdiobus

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() 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 felix 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 felix driver has the code structure in place for orderly mdiobus
removal, so just replace devm_mdiobus_alloc_size() with the non-devres
variant, and add manual free where necessary, to ensure that we don't
let devres free a still-registered bus.

Affected

14 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.16.10-1 (bookworm)	linux 5.16.10-1 (bookworm)
linux	linux	—	—
linux	linux	>= ac3a68d56651c3dad2c12c7afce065fe15267f44 < 95e5402f9430b3c7d885dd3ec4c8c02c17936923	95e5402f9430b3c7d885dd3ec4c8c02c17936923
linux	linux	>= ac3a68d56651c3dad2c12c7afce065fe15267f44 < 8cda7577a0b4018572f31e0caadfabd305ea2786	8cda7577a0b4018572f31e0caadfabd305ea2786
linux	linux	>= ac3a68d56651c3dad2c12c7afce065fe15267f44 < 9db6f056efd089e80d81c774c01b639adf30c097	9db6f056efd089e80d81c774c01b639adf30c097
linux	linux	>= ac3a68d56651c3dad2c12c7afce065fe15267f44 < 209bdb7ec6a28c7cdf580a0a98afbc9fc3b98932	209bdb7ec6a28c7cdf580a0a98afbc9fc3b98932
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.10.103-1	5.10.103-1
linux	linux_kernel	>= 0 < 5.16.10-1	5.16.10-1
linux	linux_kernel	>= 0 < 5.16.10-1	5.16.10-1
linux	linux_kernel	>= 0 < 5.16.10-1	5.16.10-1
linux	linux_kernel	>= 5.11 < 5.15.24	5.15.24
linux	linux_kernel	>= 5.16 < 5.16.10	5.16.10
linux	linux_kernel	>= 5.9 < 5.10.101	5.10.101

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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