CVE-2019-9213

high-risk
Published 2019-03-05

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.

Do I need to act?

~
6.8% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
!
2 public exploits available
46502, 47957
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (10)

Affected Vendors

Debian Redhat Linux Canonical Opensuse

References (52)

Patch http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0a1d52...
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00045.html
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00052.html
Exploit http://packetstormsecurity.com/files/156053/Reliable-Datagram-Sockets-RDS-rds_at...
Third Party Advisory http://www.securityfocus.com/bid/107296
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:0831
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:1479
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:1480
Exploit https://bugs.chromium.org/p/project-zero/issues/detail?id=1792
Mailing List https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.105
Mailing List https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.27
Mailing List https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.14
Mailing List https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.162
Mailing List https://github.com/torvalds/linux/commit/0a1d52994d440e21def1c2174932410b4f2a98a...
Mailing List https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html
Mailing List https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html
Mailing List https://lists.debian.org/debian-lts-announce/2019/05/msg00002.html
Third Party Advisory https://usn.ubuntu.com/3930-1/
Third Party Advisory https://usn.ubuntu.com/3930-2/
Third Party Advisory https://usn.ubuntu.com/3931-1/
and 32 more references
50
/ 100
high-risk
Severity 18/34 · Moderate
Exploitability 16/34 · Moderate
Exposure 16/34 · Moderate