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Fencer Vulns
low 3.3

CVE-2018-20855 json

An issue was discovered in the Linux kernel before 4.18.7.

published 2019-07-26 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-13395

cvss
3.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

An issue was discovered in the Linux kernel before 4.18.7. In create_qp_common in drivers/infiniband/hw/mlx5/qp.c, mlx5_ib_create_qp_resp was never initialized, resulting in a leak of stack memory to userspace.

Patch / fix

  • linux linux_kernel 4.18.7
  • linux Debian 14, Debian 13, Debian 12 4.18.8-1

debian advisories DEBIAN-CVE-2018-20855

  • kernel-rt SLE Real Time 12 SP4 4.12.14-8.3.1
  • kernel-syms-rt SLE Real Time 12 SP4 4.12.14-8.3.1
  • kernel-rt_debug SLE Real Time 12 SP4 4.12.14-8.3.1
  • kernel-source-rt SLE Real Time 12 SP4 4.12.14-8.3.1
  • kernel-source-rt Real Time Module 15 SP1 4.12.14-14.8.1
  • kernel-rt Real Time Module 15 SP1 4.12.14-14.8.1
  • kernel-syms-rt Real Time Module 15 SP1 4.12.14-14.8.1
  • kernel-rt_debug Real Time Module 15 SP1 4.12.14-14.8.1

suse advisories SUSE-SU-2019:2450-1SUSE-SU-2019:2430-1SUSE-SU-2019:2299-1SUSE-SU-2019:2263-1SUSE-SU-2019:2262-1SUSE-SU-2019:14157-1

  • kernel-syms openSUSE Leap 15.0 4.12.14-lp150.12.70.1
  • kernel-obs-qa openSUSE Leap 15.0 4.12.14-lp150.12.70.1
  • kernel-source openSUSE Leap 15.0 4.12.14-lp150.12.70.1
  • kernel-default openSUSE Leap 15.0 4.12.14-lp150.12.70.1
  • kernel-vanilla openSUSE Leap 15.0 4.12.14-lp150.12.70.1
  • kernel-kvmsmall openSUSE Leap 15.0 4.12.14-lp150.12.70.1
  • kernel-obs-build openSUSE Leap 15.0 4.12.14-lp150.12.70.1
  • kernel-syms openSUSE Leap 15.1 4.12.14-lp151.28.13.1

opensuse advisories openSUSE-SU-2019:1924-1openSUSE-SU-2019:1923-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-20855 updated cvss 3.3

kernel: Information leak in create_qp_common in drivers/infiniband/hw/mlx5/qp.c

  • Red Hat Enterprise Linux 7 perf, kernel, kernel-alt, python-perf, kernel-kdump, kernel-tools, +3 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    affected: workaround, no fix planned “If the InfiniBand device is in use, there is no known mitigation for this flaw. If the InfiniBand device is not in use, the kernel module (mlx5_ib) can be blacklisted and unloaded.”
  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 kernel, bpftool, kernel-rt, kernel-rt-kvm, kernel-rt-trace, kernel-rt-debug-kvm, +1 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.