What is CVE-2018-19854?

CVE-2018-19854 is a medium-severity vulnerability in Linux Kernel, classified under Information Disclosure. CVSS score: 4.7/10. Published 2018-12-04.

How severe is CVE-2018-19854?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Information disclosure in Linux Kernel

CVE-2018-19854

An issue was discovered in the Linux kernel before 4.19.3. crypto_report_one() and related functions in crypto/crypto_user.c (the crypto user configuration API) do not fully initialize structures that are copied to userspace, potentially leaking sensitive memory to user programs. NOTE: this is a CVE-2013-2547 regression but with easier exploitability because the attacker does not need a capability (however, the system must have the CONFIG_CRYPTO_USER kconfig option).

Vulnerability class: Information Disclosure

Published 2018-12-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (36.8th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Linux Kernel
Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

github.com/torvalds/linux/commit/f43f39958beb206b53292801e216d9b8a660f087 (Patch, Third Party Advisory)
usn.ubuntu.com/3872-1/ (vendor-advisory, Third Party Advisory)
usn.ubuntu.com/3901-2/ (vendor-advisory, Third Party Advisory)
usn.ubuntu.com/3878-1/ (vendor-advisory, Third Party Advisory)
usn.ubuntu.com/3878-2/ (vendor-advisory, Third Party Advisory)
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Vendor Advisory)
kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.3 (Vendor Advisory)
usn.ubuntu.com/3901-1/ (vendor-advisory, Third Party Advisory)
access.redhat.com/errata/RHSA-2019:3309 (vendor-advisory)
access.redhat.com/errata/RHSA-2019:3517 (vendor-advisory)

Frequently asked questions

What is CVE-2018-19854?: CVE-2018-19854 is a medium-severity vulnerability in Linux Kernel, classified under Information Disclosure. CVSS score: 4.7/10. Published 2018-12-04.
How severe is CVE-2018-19854?: Medium severity. CVSS v3 base score is 4.7 out of 10.