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CVE-2018-19364: QEMU file sharing may crash when used by multiple threads

CVE-2018-19364 · published 7 years ago

Summary

QEMU's 9p file system code can change a file identifier while another thread is still using it, which may cause memory errors and crashes. This affects QEMU installations and Linux distributions that ship it, such as Ubuntu, Debian, Fedora, and openSUSE Leap. Apply the latest security updates from your vendor or upgrade QEMU to a version that includes the fix.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software

Vendor	Product	Affected versions
qemu	qemu	<= 3.0.0 3.1.0 `cpe:2.3:a:qemu:qemu::::::::`
canonical	ubuntu_linux	14.04 16.04 18.04 18.10 `cpe:2.3:o:canonical:ubuntu_linux:14.04::::lts:::`
debian	debian_linux	8.0 9.0 `cpe:2.3:o:debian:debian_linux:8.0:::::::*`
fedoraproject	fedora	29 `cpe:2.3:o:fedoraproject:fedora:29:::::::*`
opensuse	leap	42.3 `cpe:2.3:o:opensuse:leap:42.3:::::::*`

Original advisory text

hw/9pfs/cofile.c and hw/9pfs/9p.c in QEMU can modify an fid path while it is being accessed by a second thread, leading to (for example) a use-after-free outcome.

References

http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00042.html Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2018/11/20/1 Mailing List Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/01/msg00023.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
https://lists.gnu.org/archive/html/qemu-devel/2018-11/msg01139.html Mailing List Patch Vendor Advisory
https://lists.gnu.org/archive/html/qemu-devel/2018-11/msg02795.html Mailing List Patch Vendor Advisory
https://seclists.org/bugtraq/2019/May/76 Mailing List Third Party Advisory
https://usn.ubuntu.com/3826-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4454 Third Party Advisory

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit (estimated)
Gives an attacker partial control (estimated)

Severity

5.5 Medium

Exploitation

<1% chance of attack within 30 days

Type

CWE-416Use After Free

Timeline

Published13 Dec 2018

Updated4 Nov 2026

First seen29 Sep 2026

Sources

CVE-2018-19364 · NVD

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