CVE-2022-49238

/// Technical description

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

ath11k: free peer for station when disconnect from AP for QCA6390/WCN6855

Commit b4a0f54156ac ("ath11k: move peer delete after vdev stop of station

for QCA6390 and WCN6855") is to fix firmware crash by changing the WMI

command sequence, but actually skip all the peer delete operation, then

it lead commit 58595c9874c6 ("ath11k: Fixing dangling pointer issue upon

peer delete failure") not take effect, and then happened a use-after-free

warning from KASAN. because the peer->sta is not set to NULL and then used

later.

Change to only skip the WMI_PEER_DELETE_CMDID for QCA6390/WCN6855.

log of user-after-free:

[ 534.888665] BUG: KASAN: use-after-free in ath11k_dp_rx_update_peer_stats+0x912/0xc10 [ath11k]

[ 534.888696] Read of size 8 at addr ffff8881396bb1b8 by task rtcwake/2860

[ 534.888705] CPU: 4 PID: 2860 Comm: rtcwake Kdump: loaded Tainted: G W 5.15.0-wt-ath+ #523

[ 534.888712] Hardware name: Inte

/// 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