CVE-2022-48814 Affecting kernel-default-base package, versions <5.14.21-150400.24.128.1.150400.24.62.1
Threat Intelligence
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- published16 Aug 2024
- disclosed15 Aug 2024
Introduced: 15 Aug 2024
CVE-2022-48814 (opens in a new tab)How to fix?
Upgrade SLES:15.4 kernel-default-base to version 5.14.21-150400.24.128.1.150400.24.62.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-default-base package and not the kernel-default-base package as distributed by SLES.
See How to fix? for SLES:15.4 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
net: dsa: seville: 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 Seville VSC9959 switch is a platform 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 seville 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 seville driver has a code structure that could accommodate both the mdiobus_unregister and mdiobus_free calls, but it has an external dependency upon mscc_miim_setup() from mdio-mscc-miim.c, which calls devm_mdiobus_alloc_size() on its behalf. So rather than restructuring that, and exporting yet one more symbol mscc_miim_teardown(), let's work with devres and replace of_mdiobus_register with the devres variant. When we use all-devres, we can ensure that devres doesn't free a still-registered bus (it either runs both callbacks, or none).
References
- https://www.suse.com/security/cve/CVE-2022-48814.html
- https://bugzilla.suse.com/1227944
- https://git.kernel.org/stable/c/0e816362d823cd46c666e64d8bffe329ee22f4cc
- https://git.kernel.org/stable/c/1d13e7221035947c62800c9d3d99b4ed570e27e7
- https://git.kernel.org/stable/c/bd488afc3b39e045ba71aab472233f2a78726e7b