An issue was discovered in the Linux kernel before 5.0.19.

published 2019-08-27 7y ago modified 2026-06-17 4mo ago also EUVD-2019-6616

cvss: 4.4; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.7%; EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits: 0; none known

An issue was discovered in the Linux kernel before 5.0.19. There is an out-of-bounds array access in __xfrm_policy_unlink, which will cause denial of service, because verify_newpolicy_info in net/xfrm/xfrm_user.c mishandles directory validation.

Patch / fix

fixed in 1 distros 5 links 1

linux linux_kernel 5.0.19

debian ubuntu red hat suse opensuse

linux Debian 14, Debian 13, Debian 12 5.2.6-1

debian advisories DEBIAN-CVE-2019-15666

linux Ubuntu 16.04 LTS 4.4.0-157.185
linux Ubuntu 18.04 LTS 4.15.0-60.67
linux-aws Ubuntu 16.04 LTS 4.4.0-1090.101
linux-aws Ubuntu 18.04 LTS 4.15.0-1047.49
linux-gcp Ubuntu 16.04 LTS 4.15.0-1041.43
linux-gcp Ubuntu 18.04 LTS 4.15.0-1042.45
linux-hwe Ubuntu 16.04 LTS 4.15.0-60.67~16.04.1
linux-hwe Ubuntu 18.04 LTS 5.0.0-27.28~18.04.1

ubuntu advisories UBUNTU-CVE-2019-15666

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

kernel-alt RHEL 7 4.14.0-115.19.1.el7a
perf RHEL 7 4.14.0-115.19.1.el7a
kernel RHEL 7 4.14.0-115.19.1.el7a
python-perf RHEL 7 4.14.0-115.19.1.el7a
kernel-tools RHEL 7 4.14.0-115.19.1.el7a
kernel-tools-libs RHEL 7 4.14.0-115.19.1.el7a
kernel-bootwrapper RHEL 7 4.14.0-115.19.1.el7a
kernel-abi-whitelists RHEL 7 4.14.0-115.19.1.el7a

red hat advisories RHSA-2020:1493 RHSA-2019:3517 RHSA-2019:3309

kernel-syms SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 4.4.121-92.125.1
kernel-source SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 4.4.121-92.125.1
kernel-default SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +2 more 4.4.121-92.125.1
kgraft-patch-SLE12-SP2_Update_33 SLES for SAP 12 SP2, SLES 12 SP2-LTSS, OpenStack Cloud 7 1-3.5.1
kernel-syms SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 4.4.180-94.107.1
kernel-source SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 4.4.180-94.107.1
kernel-default SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +5 more 4.4.180-94.107.1
kgraft-patch-SLE12-SP3_Update_29 SLES for SAP 12 SP3, SLES 12 SP3-LTSS, OpenStack Cloud Crowbar 8 +3 more 1-4.3.1

suse advisories SUSE-SU-2020:1784-1 SUSE-SU-2020:1767-1 SUSE-SU-2020:1758-1 SUSE-SU-2020:1656-1 SUSE-SU-2020:1671-1 SUSE-SU-2019:2984-1

kernel-syms openSUSE Leap 15.1 4.12.14-lp151.28.16.1
kernel-obs-qa openSUSE Leap 15.1 4.12.14-lp151.28.16.1
kernel-source openSUSE Leap 15.1 4.12.14-lp151.28.16.1
kernel-default openSUSE Leap 15.1 4.12.14-lp151.28.16.1
kernel-vanilla openSUSE Leap 15.1 4.12.14-lp151.28.16.1
kernel-kvmsmall openSUSE Leap 15.1 4.12.14-lp151.28.16.1
kernel-obs-build openSUSE Leap 15.1 4.12.14-lp151.28.16.1
kernel-syms openSUSE Leap 15.0 4.12.14-lp150.12.73.1

opensuse advisories openSUSE-SU-2019:2181-1 openSUSE-SU-2019:2173-1

git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b80… commit

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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-2019-15666 updated 2026-11-07 cvss 6.7

kernel: out-of-bounds array access in __xfrm_policy_unlink

Red Hat Enterprise Linux 5 kernel
affected: no fix planned “Out of support scope”
Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-147.el8, kernel-debuginfo-common-aarch64 4.18.0-147.el8, kernel-debuginfo-common-ppc64le 4.18.0-147.el8 Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-147.el8, kernel 4.18.0-147.el8, bpftool 4.18.0-147.el8, kernel-core 4.18.0-147.el8, kernel-tools 4.18.0-147.el8, python3-perf 4.18.0-147.el8, +15 more
fixed: vendor fix RHSA-2019:3517
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) perf 4.14.0-115.19.1.el7a, kernel 4.14.0-115.19.1.el7a, kernel-alt 4.14.0-115.19.1.el7a, python-perf 4.14.0-115.19.1.el7a, kernel-tools 4.14.0-115.19.1.el7a, kernel-tools-libs 4.14.0-115.19.1.el7a, +3 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) kernel-debuginfo-common-ppc64le 4.14.0-115.19.1.el7a
fixed: vendor fix RHSA-2020:1493
Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-147.rt24.93.el8, kernel-rt-core 4.18.0-147.rt24.93.el8, kernel-rt-modules 4.18.0-147.rt24.93.el8, kernel-rt-debug-core 4.18.0-147.rt24.93.el8, kernel-rt-debug-modules 4.18.0-147.rt24.93.el8, kernel-rt-modules-extra 4.18.0-147.rt24.93.el8, +2 more Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-147.rt24.93.el8, kernel-rt-kvm 4.18.0-147.rt24.93.el8, kernel-rt-core 4.18.0-147.rt24.93.el8, kernel-rt-modules 4.18.0-147.rt24.93.el8, kernel-rt-debug-kvm 4.18.0-147.rt24.93.el8, kernel-rt-debug-core 4.18.0-147.rt24.93.el8, +4 more
fixed: vendor fix RHSA-2019:3309
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
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

1.73% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	4.4	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	4.9	AV:L/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness

CWE-125 Out-of-bounds Read

Technology feeds

Linux kernel rss critical rss

References

git.kernel.org /pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b805d78d300bcf2c83d6df7da0c818b0fee41427
patch, vendor-advisory
lists.opensuse.org /opensuse-security-announce/2019-09/msg00064.html
vendor-advisory, third-party-advisory
lists.opensuse.org /opensuse-security-announce/2019-09/msg00066.html
vendor-advisory, third-party-advisory
cdn.kernel.org /pub/linux/kernel/v5.x/ChangeLog-5.0.19
release-notes
lists.debian.org /debian-lts-announce/2019/09/msg00014.html
mailing-list, third-party-advisory
lists.debian.org /debian-lts-announce/2019/09/msg00015.html
mailing-list, third-party-advisory
security.netapp.com /advisory/ntap-20191004-0001/
third-party-advisory
support.f5.com /csp/article/K53420251?utm_source=f5support&amp%3Butm_medium=RSS

Sources

CVE List CVE-2019-15666
NVD CVE-2019-15666

Fencer Intel 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.