CVE-2022-48815

published 2024-07-16

CVE-2022-48815: In the Linux kernel, the following vulnerability has been resolved: net: dsa: bcm_sf2: don't use devres for mdiobus As explained in commits: 74b6d7d13307…

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: bcm_sf2: 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 bcm_sf2 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 bcm_sf2 driver has the code structure in place for orderly mdiobus
removal, so just replace devm_mdiobus_alloc() 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 < 2770b795294ed312375c11ef1d0b810499c66b83	2770b795294ed312375c11ef1d0b810499c66b83
linux	linux	>= ac3a68d56651c3dad2c12c7afce065fe15267f44 < caabb5f64f5c32fceed93356bb688ef1ec6c5783	caabb5f64f5c32fceed93356bb688ef1ec6c5783
linux	linux	>= ac3a68d56651c3dad2c12c7afce065fe15267f44 < 08e1a3554e99a1a5bd2835907381e2383ee85cae	08e1a3554e99a1a5bd2835907381e2383ee85cae
linux	linux	>= ac3a68d56651c3dad2c12c7afce065fe15267f44 < 08f1a20822349004bb9cc1b153ecb516e9f2889d	08f1a20822349004bb9cc1b153ecb516e9f2889d
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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