CVE-2019-9213: Null Pointer Dereference
First published: Tue Mar 05 2019(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <4.20.14 | 4.20.14 |
| Linux Kernel | >=4.9<4.9.162 | |
| Linux Kernel | >=4.14<4.14.105 | |
| Linux Kernel | >=4.19<4.19.27 | |
| Linux Kernel | >=4.20<4.20.14 | |
| Debian GNU/Linux | =8.0 | |
| Red Hat Enterprise Linux | =7.0 | |
| Red Hat Enterprise Linux | =8.0 | |
| openSUSE | =15.0 | |
| openSUSE | =42.3 | |
| Ubuntu Linux | =12.04 | |
| Ubuntu Linux | =14.04 | |
| Ubuntu Linux | =16.04 | |
| Ubuntu Linux | =18.10 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.11-1 6.12.12-1 |
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Reference Links
- 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://packetstormsecurity.com/files/156053/Reliable-Datagram-Sockets-RDS-rds_atomic_free_op-Privilege-Escalation.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/
- https://launchpad.net/bugs/cve/CVE-2019-9213
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0a1d52994d440e21def1c2174932410b4f2a98a1
- https://seclists.org/oss-sec/2019/q1/166
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1686137
- https://bugzilla.redhat.com/show_bug.cgi?id=1686136
- https://git.kernel.org/linus/0a1d52994d440e21def1c2174932410b4f2a98a1
- https://security-tracker.debian.org/tracker/CVE-2019-9213
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9213
- https://nvd.nist.gov/vuln/detail/CVE-2019-9213
- https://ubuntu.com/security/CVE-2019-9213
Frequently Asked Questions
What is the severity of CVE-2019-9213?
CVE-2019-9213 has a high severity level due to potential exploitation leading to kernel NULL pointer dereferences.
How do I fix CVE-2019-9213?
To mitigate CVE-2019-9213, upgrade to Linux kernel version 4.20.14 or later.
Which versions of the Linux kernel are affected by CVE-2019-9213?
CVE-2019-9213 affects Linux kernel versions prior to 4.20.14, including versions 4.9.x, 4.14.x, 4.19.x, and the 4.20.x series.
What platforms are impacted by CVE-2019-9213?
CVE-2019-9213 primarily affects non-SMAP platforms running vulnerable Linux kernel versions.
Is CVE-2019-9213 remotely exploitable?
Yes, CVE-2019-9213 can potentially be exploited remotely on affected systems, increasing the risk significantly.
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