发布于3月6日3月6日 Members SUSE: CVE-2021-47231: SUSE Linux Security Advisory Severity 4 CVSS (AV:L/AC:M/Au:N/C:P/I:P/A:P) Published 05/21/2024 Created 08/16/2024 Added 08/09/2024 Modified 08/09/2024 Description In the Linux kernel, the following vulnerability has been resolved: can: mcba_usb: fix memory leak in mcba_usb Syzbot reported memory leak in SocketCAN driver for Microchip CAN BUS Analyzer Tool. The problem was in unfreed usb_coherent. In mcba_usb_start() 20 coherent buffers are allocated and there is nothing, that frees them: 1) In callback function the urb is resubmitted and that's all 2) In disconnect function urbs are simply killed, but URB_FREE_BUFFER is not set (see mcba_usb_start) and this flag cannot be used with coherent buffers. Fail log: | [ 1354.053291][ T8413] mcba_usb 1-1:0.0 can0: device disconnected | [ 1367.059384][ T8420] kmemleak: 20 new suspected memory leaks (see /sys/kernel/debug/kmem) So, all allocated buffers should be freed with usb_free_coherent() explicitly NOTE: The same pattern for allocating and freeing coherent buffers is used in drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c Solution(s) suse-upgrade-kernel-64kb suse-upgrade-kernel-64kb-devel suse-upgrade-kernel-azure suse-upgrade-kernel-azure-base suse-upgrade-kernel-azure-devel suse-upgrade-kernel-default suse-upgrade-kernel-default-base suse-upgrade-kernel-default-devel suse-upgrade-kernel-default-extra suse-upgrade-kernel-default-man suse-upgrade-kernel-devel suse-upgrade-kernel-devel-azure suse-upgrade-kernel-docs suse-upgrade-kernel-macros suse-upgrade-kernel-obs-build suse-upgrade-kernel-preempt suse-upgrade-kernel-preempt-devel suse-upgrade-kernel-source suse-upgrade-kernel-source-azure suse-upgrade-kernel-syms suse-upgrade-kernel-syms-azure suse-upgrade-kernel-zfcpdump suse-upgrade-reiserfs-kmp-default References https://attackerkb.com/topics/cve-2021-47231 CVE - 2021-47231
