CVE-2022-50408

/// Technical description

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

wifi: brcmfmac: fix use-after-free bug in brcmf_netdev_start_xmit()

> ret = brcmf_proto_tx_queue_data(drvr, ifp->ifidx, skb);

may be schedule, and then complete before the line

> ndev->stats.tx_bytes += skb->len;

[ 46.912801] ==================================================================

[ 46.920552] BUG: KASAN: use-after-free in brcmf_netdev_start_xmit+0x718/0x8c8 [brcmfmac]

[ 46.928673] Read of size 4 at addr ffffff803f5882e8 by task systemd-resolve/328

[ 46.935991]

[ 46.937514] CPU: 1 PID: 328 Comm: systemd-resolve Tainted: G O 5.4.199-[REDACTED] #1

[ 46.947255] Hardware name: [REDACTED]

[ 46.954568] Call trace:

[ 46.957037] dump_backtrace+0x0/0x2b8

[ 46.960719] show_stack+0x24/0x30

[ 46.964052] dump_stack+0x128/0x194

[ 46.967557] print_address_description.isra.0+0x64/0x380

[ 46.972877] __kasan_report+0x1d4/0x240

[ 46.976723] kasan_report+0xc/0x18

[ 46.980138

/// 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