CVE-2021-47231
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47231
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47231.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-47231
- Related
- Published
- 2024-05-21T15:15:12Z
- Modified
- 2024-11-06T20:35:02Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
can: mcbausb: fix memory leak in mcbausb
Syzbot reported memory leak in SocketCAN driver for Microchip CAN BUS Analyzer Tool. The problem was in unfreed usb_coherent.
In mcbausbstart() 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 URBFREEBUFFER is not set (see mcbausbstart) 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 usbfreecoherent() explicitly
NOTE: The same pattern for allocating and freeing coherent buffers is used in drivers/net/can/usb/kvaserusb/kvaserusb_core.c
- References
-
- https://git.kernel.org/stable/c/6bd3d80d1f019cefa7011056c54b323f1d8b8e83
- https://git.kernel.org/stable/c/6f87c0e21ad20dd3d22108e33db1c552dfa352a0
- https://git.kernel.org/stable/c/89df95ce32be204eef2e7d4b2f6fb552fb191a68
- https://git.kernel.org/stable/c/91c02557174be7f72e46ed7311e3bea1939840b0
- https://git.kernel.org/stable/c/a115198caaab6d663bef75823a3c5f0802306d60
- https://git.kernel.org/stable/c/d0760a4ef85697bc756d06eae17ae27f3f055401
- https://security-tracker.debian.org/tracker/CVE-2021-47231
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source