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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.

Severity: 2/4.

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.

ACCESS TO THE FULL VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/Linux-kernel-use-after-free-via-usb-sg-cancel-32156


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