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
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | May 21, 2024 |
| Suse | — | Upgrade kernel-default-manUpgrade kernel-develUpgrade kernel-zfcpdumpUpgrade kernel-devel-azureUpgrade kernel-symsUpgrade kernel-azure-baseUpgrade kernel-source-azureUpgrade kernel-default-extraUpgrade kernel-64kb-develUpgrade reiserfs-kmp-defaultUpgrade kernel-64kbUpgrade kernel-macrosUpgrade kernel-sourceUpgrade kernel-default-baseUpgrade kernel-default-develUpgrade kernel-preempt-develUpgrade kernel-docsUpgrade kernel-preemptUpgrade kernel-azure-develUpgrade kernel-syms-azureUpgrade kernel-azureUpgrade kernel-obs-buildUpgrade kernel-default | Aug 9, 2024 | May 21, 2024 |
| Ubuntu | — | Upgrade linux-gcp-fipsUpgrade linux-gcpUpgrade linux-fipsUpgrade linux-azure-5.4Upgrade linux-oracleUpgrade linux-gkeopUpgrade linux-azure-4.15Upgrade linux-hweUpgrade linux-gcp-5.4Upgrade linux-gcp-4.15Upgrade linux-hwe-5.4Upgrade linux-azure-fipsUpgrade linuxUpgrade linux-aws-fipsUpgrade linux-raspiUpgrade linux-raspi-5.4Upgrade linux-aws-5.4Upgrade linux-awsUpgrade linux-bluefieldUpgrade linux-azureUpgrade linux-aws-hweUpgrade linux-oracle-5.4Upgrade linux-kvm | Nov 19, 2024 | May 21, 2024 |
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