CVE-2022-49692

/// Technical description

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

net: phy: at803x: fix NULL pointer dereference on AR9331 PHY

Latest kernel will explode on the PHY interrupt config, since it depends

now on allocated priv. So, run probe to allocate priv to fix it.

ar9331_switch ethernet.1:10 lan0 (uninitialized): PHY [!ahb!ethernet@1a000000!mdio!switch@10:00] driver [Qualcomm Atheros AR9331 built-in PHY] (irq=13)

CPU 0 Unable to handle kernel paging request at virtual address 0000000a, epc == 8050e8a8, ra == 80504b34

...

Call Trace:

[<8050e8a8>] at803x_config_intr+0x5c/0xd0

[<80504b34>] phy_request_interrupt+0xa8/0xd0

[<8050289c>] phylink_bringup_phy+0x2d8/0x3ac

[<80502b68>] phylink_fwnode_phy_connect+0x118/0x130

[<8074d8ec>] dsa_slave_create+0x270/0x420

[<80743b04>] dsa_port_setup+0x12c/0x148

[<8074580c>] dsa_register_switch+0xaf0/0xcc0

[<80511344>] ar9331_sw_probe+0x370/0x388

[<8050cb78>] mdio_probe+0x44/0x70

[<804df300>] really_probe+0x200/0x424

[<804df7b

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References