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CVE-2018-19364

20
FAUCET Score

CVE-2018-19364 describes a use-after-free vulnerability in QEMU's 9pfs components (hw/9pfs/cofile.c and hw/9pfs/9p.c) that can occur when an fid path is modified concurrently by a second thread. This medium-severity vulnerability (CVSS 5.5) allows a local attacker with low privileges to achieve high availability impact, affecting products like Canonical, Debian, FedoraProject, openSUSE, and QEMU. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.0.0CPE matchmatch criteria
cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*
3.1.0CPE matchmatch criteria
cpe:2.3:a:qemu:qemu:3.1.0:rc0:*:*:*:*:*:*
3.1.0CPE matchmatch criteria
cpe:2.3:a:qemu:qemu:3.1.0:rc1:*:*:*:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.53%
Probability of exploitation in next 30 days
EPSS Percentile
41.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0053 is in the 93rd percentile among its peer group of 15,940 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2018-19364Low

Qemu: 9pfs: Use-after-free due to race condition while updating fid path

Nov 7, 2018

References

lists.opensuse.org / opensuse-security-announce/2019-03/msg00042.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2019/01/msg00023.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/CGCFIFSIWUREEQQOZDZFBYKWZHXCWBZN
lists.gnu.org / archive/html/qemu-devel/2018-11/msg01139.html
Mailing ListPatchVendor Advisory
lists.gnu.org / archive/html/qemu-devel/2018-11/msg02795.html
Mailing ListPatchVendor Advisory
seclists.org / bugtraq/2019/May/76
Mailing ListThird Party Advisory
usn.ubuntu.com / 3826-1
Third Party Advisory
debian.org / security/2019/dsa-4454
Third Party Advisory
openwall.com / lists/oss-security/2018/11/20/1
Mailing ListPatchThird Party Advisory