CVE-2023-53581

/// Technical description

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

net/mlx5e: Check for NOT_READY flag state after locking

Currently the check for NOT_READY flag is performed before obtaining the

necessary lock. This opens a possibility for race condition when the flow

is concurrently removed from unready_flows list by the workqueue task,

which causes a double-removal from the list and a crash[0]. Fix the issue

by moving the flag check inside the section protected by

uplink_priv->unready_flows_lock mutex.

[0]:

[44376.389654] general protection fault, probably for non-canonical address 0xdead000000000108: 0000 [#1] SMP

[44376.391665] CPU: 7 PID: 59123 Comm: tc Not tainted 6.4.0-rc4+ #1

[44376.392984] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014

[44376.395342] RIP: 0010:mlx5e_tc_del_fdb_flow+0xb3/0x340 [mlx5_core]

[44376.396857] Code: 00 48 8b b8 68 ce 02 00 e8 8a 4d 02 00 4c 8d a8 a8 01 00 00 4c 89 ef e8 8b 79 88 e1

/// 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