CVE-2019-9213

MEDIUM

Description

In the Linux kernel before 4.20.14, expand_downwards in mm/mmap.c lacks a check for the mmap minimum address, which makes it easier for attackers to exploit kernel NULL pointer dereferences on non-SMAP platforms. This is related to a capability check for the wrong task.

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0a1d52994d440e21def1c2174932410b4f2a98a1

http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00045.html

http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00052.html

http://www.securityfocus.com/bid/107296

https://access.redhat.com/errata/RHSA-2019:0831

https://access.redhat.com/errata/RHSA-2019:1479

https://access.redhat.com/errata/RHSA-2019:1480

https://bugs.chromium.org/p/project-zero/issues/detail?id=1792

https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.105

https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.27

https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.14

https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.162

https://github.com/torvalds/linux/commit/0a1d52994d440e21def1c2174932410b4f2a98a1

https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html

https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html

https://lists.debian.org/debian-lts-announce/2019/05/msg00002.html

https://usn.ubuntu.com/3930-1/

https://usn.ubuntu.com/3930-2/

https://usn.ubuntu.com/3931-1/

https://usn.ubuntu.com/3931-2/

https://usn.ubuntu.com/3932-1/

https://usn.ubuntu.com/3932-2/

https://usn.ubuntu.com/3933-1/

https://usn.ubuntu.com/3933-2/

https://www.exploit-db.com/exploits/46502/

Details

Source: MITRE

Published: 2019-03-05

Updated: 2019-06-17

Type: CWE-476

Risk Information

CVSS v2.0

Base Score: 4.9

Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C

Impact Score: 6.9

Exploitability Score: 3.9

Severity: MEDIUM

CVSS v3.0

Base Score: 5.5

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

Impact Score: 3.6

Exploitability Score: 1.8

Severity: MEDIUM