CVE-2022-50178

/// Technical description

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

wifi: rtw89: 8852a: rfk: fix div 0 exception

The DPK is a kind of RF calibration whose algorithm is to fine tune

parameters and calibrate, and check the result. If the result isn't good

enough, it could adjust parameters and try again.

This issue is to read and show the result, but it could be a negative

calibration result that causes divisor 0 and core dump. So, fix it by

phy_div() that does division only if divisor isn't zero; otherwise,

zero is adopted.

divide error: 0000 [#1] PREEMPT SMP NOPTI

CPU: 1 PID: 728 Comm: wpa_supplicant Not tainted 5.10.114-16019-g462a1661811a #1 <HASH:d024 28>

RIP: 0010:rtw8852a_dpk+0x14ae/0x288f [rtw89_core]

RSP: 0018:ffffa9bb412a7520 EFLAGS: 00010246

RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000

RDX: 0000000000000000 RSI: 00000000000180fc RDI: ffffa141d01023c0

RBP: ffffa9bb412a76a0 R08: 0000000000001319 R09: 00000000ffffff92

R10: ffffffffc0292de3

/// 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