CVE-2022-48640

Technical Description

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

bonding: fix NULL deref in bond_rr_gen_slave_id

Fix a NULL dereference of the struct bonding.rr_tx_counter member because

if a bond is initially created with an initial mode != zero (Round Robin)

the memory required for the counter is never created and when the mode is

changed there is never any attempt to verify the memory is allocated upon

switching modes.

This causes the following Oops on an aarch64 machine:

[ 334.686773] Unable to handle kernel paging request at virtual address ffff2c91ac905000

[ 334.694703] Mem abort info:

[ 334.697486] ESR = 0x0000000096000004

[ 334.701234] EC = 0x25: DABT (current EL), IL = 32 bits

[ 334.706536] SET = 0, FnV = 0

[ 334.709579] EA = 0, S1PTW = 0

[ 334.712719] FSC = 0x04: level 0 translation fault

[ 334.717586] Data abort info:

[ 334.720454] ISV = 0, ISS = 0x00000004

[ 334.724288] CM = 0, WnR = 0

[ 334.727244]

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References