CVE-2018-20856 Information

Description

An issue was discovered in the Linux kernel before 4.18.7. In block/blk-core.c there is an __blk_drain_queue() use-after-free because a certain error case is mishandled.

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

http://packetstormsecurity.com/files/154059/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html http://packetstormsecurity.com/files/154408/Kernel-Live-Patch-Security-Notice-LSN-0055-1.html http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html https://access.redhat.com/errata/RHSA-2019:3055 https://access.redhat.com/errata/RHSA-2019:3076 https://access.redhat.com/errata/RHSA-2019:3089 https://access.redhat.com/errata/RHSA-2019:3217 https://access.redhat.com/errata/RHSA-2020:0100 https://access.redhat.com/errata/RHSA-2020:0103 https://access.redhat.com/errata/RHSA-2020:0543 https://access.redhat.com/errata/RHSA-2020:0664 https://access.redhat.com/errata/RHSA-2020:0698 https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.7 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=54648cf1ec2d7f4b6a71767799c45676a138ca24 https://github.com/torvalds/linux/commit/54648cf1ec2d7f4b6a71767799c45676a138ca24 https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html https://seclists.org/bugtraq/2019/Aug/18 https://seclists.org/bugtraq/2019/Aug/26 https://security.netapp.com/advisory/ntap-20190905-0002/ https://support.f5.com/csp/article/K14673240?utm_source=f5support&utm_medium=RSS https://usn.ubuntu.com/4094-1/ https://usn.ubuntu.com/4116-1/ https://usn.ubuntu.com/4118-1/ https://www.debian.org/security/2019/dsa-4497

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8