CVE-2020-11725

Summary

snd_ctl_elem_add in sound/core/control.c in the Linux kernel through 5.6.3 has a count=info->owner line, which later affects a private_size*count multiplication for unspecified "interesting side effects." NOTE: kernel engineers dispute this finding, because it could be relevant only if new callers were added that were unfamiliar with the misuse of the info->owner field to represent data unrelated to the "owner" concept. The existing callers, SNDRV_CTL_IOCTL_ELEM_ADD and SNDRV_CTL_IOCTL_ELEM_REPLACE, have been designed to misuse the info->owner field in a safe way

Affected Software

Weaknesses

• n/a

ADP Enrichment

CVE Program Container

Additional References

• https://twitter.com/yabbadabbadrew/status/1248632267028582400
• https://github.com/torvalds/linux/blob/3b2549a3740efb8af0150415737067d87e466c5b/sound/core/control.c#L1434-L1474
• https://lore.kernel.org/alsa-devel/s5h4ktmlfpx.wl-tiwai%40suse.de/

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://twitter.com/yabbadabbadrew/status/1248632267028582400
• https://github.com/torvalds/linux/blob/3b2549a3740efb8af0150415737067d87e466c5b/sound/core/control.c#L1434-L1474
• https://lore.kernel.org/alsa-devel/s5h4ktmlfpx.wl-tiwai%40suse.de/

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