CVE-2018-20191: Null Pointer Dereference
First published: Thu Dec 20 2018(Updated: )
hw/rdma/vmw/pvrdma_main.c in QEMU does not implement a read operation (such as uar_read by analogy to uar_write), which allows attackers to cause a denial of service (NULL pointer dereference).
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/qemu | 1:5.2+dfsg-11+deb11u3 1:5.2+dfsg-11+deb11u2 1:7.2+dfsg-7+deb12u7 1:9.1.2+ds-1 1:9.2.0+ds-2 | |
| QEMU KVM | <=3.1.0 | |
| Ubuntu | =14.04 | |
| Ubuntu | =16.04 | |
| Ubuntu | =18.04 | |
| Ubuntu | =18.10 | |
| Fedora | =29 | |
| Fedora | =30 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2018/12/18/1
- http://www.securityfocus.com/bid/106276
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CGCFIFSIWUREEQQOZDZFBYKWZHXCWBZN/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KJMTVGDLA654HNCDGLCUEIP36SNJEKK7/
- https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg03066.html
- https://usn.ubuntu.com/3923-1/
- https://launchpad.net/bugs/cve/CVE-2018-20191
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CGCFIFSIWUREEQQOZDZFBYKWZHXCWBZN/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KJMTVGDLA654HNCDGLCUEIP36SNJEKK7/
- https://security-tracker.debian.org/tracker/CVE-2018-20191
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20191
- https://nvd.nist.gov/vuln/detail/CVE-2018-20191
- https://ubuntu.com/security/CVE-2018-20191
Frequently Asked Questions
What is the severity of CVE-2018-20191?
CVE-2018-20191 is categorized as a denial of service vulnerability due to a NULL pointer dereference.
How do I fix CVE-2018-20191?
To resolve CVE-2018-20191, update QEMU to a version that addresses this vulnerability, such as those specified in the remedy list.
Which versions of QEMU are affected by CVE-2018-20191?
CVE-2018-20191 affects QEMU versions up to 3.1.0, including specific Debian and Ubuntu releases listed in the vulnerability details.
Can CVE-2018-20191 be exploited remotely?
CVE-2018-20191 can be exploited by attackers to cause a denial of service, potentially without requiring local access.
What systems are vulnerable to CVE-2018-20191?
Systems running vulnerable versions of QEMU on Debian and Ubuntu, as well as specific Fedora versions, are affected by CVE-2018-20191.
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