Bug 1824923 (CVE-2020-11725) - CVE-2020-11725 kernel: improper handling of private_size*count multiplication due to count=info->owner typo
Summary: CVE-2020-11725 kernel: improper handling of private_size*count multiplication...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-11725
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1824925 1834224 1834225 1834226 1834227 1834228
Blocks: 1824929
TreeView+ depends on / blocked
 
Reported: 2020-04-16 16:46 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-03-26 18:11 UTC (History)
45 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux kernel. The Advanced Linux Sound Architecture subsystem's snd_ctl_elem_add mishandles the private_size*count multiplication when the addition of audio control elements happen leading to a denial of service.
Clone Of:
Environment:
Last Closed: 2020-05-28 10:12:07 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2020-04-16 16:46:38 UTC 
snd_ctl_elem_add in sound/core/control.c in the Linux kernel through 5.6.3 has a count=info->owner typo, which is mishandled in the private_size*count multiplication.

References:
https://lore.kernel.org/alsa-devel/s5h4ktmlfpx.wl-tiwai@suse.de/
https://github.com/torvalds/linux/blob/3b2549a3740efb8af0150415737067d87e466c5b/sound/core/control.c#L1434-L1474
Comment 1 Guilherme de Almeida Suckevicz 2020-04-16 16:47:13 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1824925]
Comment 2 Justin M. Forbes 2020-04-16 18:40:22 UTC 
Takashi seems to feel that this is invalid and the CVE should be disputed.
Comment 4 Eric Christensen 2020-05-01 14:58:52 UTC 
External References:

https://lore.kernel.org/alsa-devel/s5h4ktmlfpx.wl-tiwai@suse.de/
https://github.com/torvalds/linux/blob/3b2549a3740efb8af0150415737067d87e466c5b/sound/core/control.c#L1434-L1474
Comment 13 Petr Matousek 2020-05-28 10:16:27 UTC 
Statement:

This CVE is being disputed as invalid (https://nvd.nist.gov/vuln/detail/CVE-2020-11725) based on the arguments presented in https://lore.kernel.org/alsa-devel/s5h4ktmlfpx.wl-tiwai@suse.de/ .
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