Vigil@nce - Linux kernel: use after free via usb_sg_cancel
June 2020 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/?langue=2
SYNTHESIS OF THE VULNERABILITY
Impacted products: Debian, Linux, openSUSE Leap, Slackware, SLES, Ubuntu.
Consequences: administrator access/rights, privileged access/rights, user access/rights, denial of service on server, denial of service on service, denial of service on client.
Provenance: user shell.
Confidence: confirmed by the editor (5/5).
Creation date: 30/04/2020.
DESCRIPTION OF THE VULNERABILITY
An attacker can force the usage of a freed memory area via usb_sg_cancel() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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