CVE-2021-47231

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Source
https://nvd.nist.gov/vuln/detail/CVE-2021-47231
Import Source
https://storage.googleapis.com/osv-test-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

Affected packages

Debian:11 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.46-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.46-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.46-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}