CVE-2018-20976 json
An issue was discovered in fs/xfs/xfs_super.c in the Linux kernel before 4.18.
published 2019-08-19 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-13512
- cvss
- 7.8
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 50%
- public exploits
- 0
- none known
Summary
An issue was discovered in fs/xfs/xfs_super.c in the Linux kernel before 4.18. A use after free exists, related to xfs_fs_fill_super failure.
Patch / fix
- linux linux_kernel 4.18
- linux Debian 14, Debian 13, Debian 12 4.18.6-1
debian advisories DEBIAN-CVE-2018-20976
- linux Ubuntu 16.04 LTS 4.4.0-165.193
- linux Ubuntu 18.04 LTS 4.15.0-65.74
- linux-aws Ubuntu 16.04 LTS 4.4.0-1095.106
- linux-aws Ubuntu 18.04 LTS 4.15.0-1051.53
- linux-gcp Ubuntu 16.04 LTS 4.15.0-1046.49
- linux-gcp Ubuntu 18.04 LTS 5.0.0-1020.20~18.04.1
- linux-hwe Ubuntu 16.04 LTS 4.15.0-65.74~16.04.1
- linux-kvm Ubuntu 16.04 LTS 4.4.0-1059.66
ubuntu advisories UBUNTU-CVE-2018-20976
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-rt enterprise mrg 2 1:3.10.0-693.64.1.rt56.662.el6rt
- kernel-rt-trace enterprise mrg 2 1:3.10.0-693.64.1.rt56.662.el6rt
- kernel-rt-vanilla enterprise mrg 2 1:3.10.0-693.64.1.rt56.662.el6rt
- kernel-rt-firmware enterprise mrg 2 1:3.10.0-693.64.1.rt56.662.el6rt
- kernel-rt-debuginfo-common-x86_64 enterprise mrg 2 1:3.10.0-693.64.1.rt56.662.el6rt
- kernel RHEL 7.4 TUS, RHEL 7.4 E4S, RHEL 7.4 AUS 3.10.0-693.64.1.el7
- perf RHEL 7.4 TUS, RHEL 7.4 E4S, RHEL 7.4 AUS 3.10.0-693.64.1.el7
- python-perf RHEL 7.4 TUS, RHEL 7.4 E4S, RHEL 7.4 AUS 3.10.0-693.64.1.el7
red hat advisories RHSA-2020:0609RHSA-2020:0592RHSA-2020:0543RHSA-2020:0661RHSA-2020:0178
- 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-2019:2984-1SUSE-SU-2019:2949-1SUSE-SU-2019:14218-1SUSE-SU-2019:2950-1SUSE-SU-2019:2756-1SUSE-SU-2019:2738-1
- 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-2019:2181-1openSUSE-SU-2019:2173-1
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-2018-20976 updated cvss 7.8
kernel: use-after-free in fs/xfs/xfs_super.c
-
Red Hat Enterprise Linux ComputeNode EUS (v. 7.5) perf 3.10.0-862.48.1.el7, kernel 3.10.0-862.48.1.el7, python-perf 3.10.0-862.48.1.el7, kernel-tools 3.10.0-862.48.1.el7, kernel-tools-libs 3.10.0-862.48.1.el7, kernel-abi-whitelists 3.10.0-862.48.1.el7, +1 more Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) kernel-debuginfo-common-x86_64 3.10.0-862.48.1.el7fixed: vendor fix RHSA-2020:0543
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Red Hat Enterprise Linux Server AUS (v. 7.2) perf 3.10.0-327.85.1.el7, kernel 3.10.0-327.85.1.el7, python-perf 3.10.0-327.85.1.el7, kernel-tools 3.10.0-327.85.1.el7, kernel-tools-libs 3.10.0-327.85.1.el7, kernel-abi-whitelists 3.10.0-327.85.1.el7, +1 morefixed: vendor fix RHSA-2020:0661
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Red Hat Enterprise Linux Server AUS (v. 7.3) perf 3.10.0-514.72.1.el7, kernel 3.10.0-514.72.1.el7, python-perf 3.10.0-514.72.1.el7, kernel-tools 3.10.0-514.72.1.el7, kernel-tools-libs 3.10.0-514.72.1.el7, kernel-abi-whitelists 3.10.0-514.72.1.el7, +1 morefixed: vendor fix RHSA-2020:0178
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Red Hat Enterprise Linux Server AUS (v. 7.4) perf 3.10.0-693.64.1.el7, kernel 3.10.0-693.64.1.el7, python-perf 3.10.0-693.64.1.el7, kernel-tools 3.10.0-693.64.1.el7, kernel-tools-libs 3.10.0-693.64.1.el7, kernel-abi-whitelists 3.10.0-693.64.1.el7, +1 morefixed: vendor fix RHSA-2020:0592
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Red Hat Enterprise Linux Server E4S (v. 7.3) perf 3.10.0-514.72.1.el7, kernel 3.10.0-514.72.1.el7, python-perf 3.10.0-514.72.1.el7, kernel-tools 3.10.0-514.72.1.el7, kernel-tools-libs 3.10.0-514.72.1.el7, kernel-bootwrapper 3.10.0-514.72.1.el7, +3 morefixed: vendor fix RHSA-2020:0178
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Red Hat Enterprise Linux Server E4S (v. 7.4) perf 3.10.0-693.64.1.el7, kernel 3.10.0-693.64.1.el7, python-perf 3.10.0-693.64.1.el7, kernel-tools 3.10.0-693.64.1.el7, kernel-tools-libs 3.10.0-693.64.1.el7, kernel-bootwrapper 3.10.0-693.64.1.el7, +3 morefixed: vendor fix RHSA-2020:0592
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Red Hat Enterprise Linux Server EUS (v. 7.5) perf 3.10.0-862.48.1.el7, kernel 3.10.0-862.48.1.el7, python-perf 3.10.0-862.48.1.el7, kernel-kdump 3.10.0-862.48.1.el7, kernel-tools 3.10.0-862.48.1.el7, kernel-tools-libs 3.10.0-862.48.1.el7, +6 morefixed: vendor fix RHSA-2020:0543
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Red Hat Enterprise Linux Server Optional AUS (v. 7.2) kernel-debuginfo-common-x86_64 3.10.0-327.85.1.el7fixed: vendor fix RHSA-2020:0661
show 11 moreshow fewer
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Red Hat Enterprise Linux Server Optional AUS (v. 7.3) kernel-debuginfo-common-x86_64 3.10.0-514.72.1.el7fixed: vendor fix RHSA-2020:0178
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Red Hat Enterprise Linux Server Optional AUS (v. 7.4) kernel-debuginfo-common-x86_64 3.10.0-693.64.1.el7fixed: vendor fix RHSA-2020:0592
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Red Hat Enterprise Linux Server Optional E4S (v. 7.3) kernel-debuginfo-common-x86_64 3.10.0-514.72.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-514.72.1.el7fixed: vendor fix RHSA-2020:0178
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Red Hat Enterprise Linux Server Optional E4S (v. 7.4) kernel-debuginfo-common-x86_64 3.10.0-693.64.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-693.64.1.el7fixed: vendor fix RHSA-2020:0592
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Red Hat Enterprise Linux Server Optional EUS (v. 7.5) kernel-debuginfo-common-ppc64 3.10.0-862.48.1.el7, kernel-debuginfo-common-x86_64 3.10.0-862.48.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-862.48.1.el7fixed: vendor fix RHSA-2020:0543
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Red Hat Enterprise Linux Server Optional TUS (v. 7.3) kernel-debuginfo-common-x86_64 3.10.0-514.72.1.el7fixed: vendor fix RHSA-2020:0178
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Red Hat Enterprise Linux Server Optional TUS (v. 7.4) kernel-debuginfo-common-x86_64 3.10.0-693.64.1.el7fixed: vendor fix RHSA-2020:0592
-
Red Hat Enterprise Linux Server TUS (v. 7.3) perf 3.10.0-514.72.1.el7, kernel 3.10.0-514.72.1.el7, python-perf 3.10.0-514.72.1.el7, kernel-tools 3.10.0-514.72.1.el7, kernel-tools-libs 3.10.0-514.72.1.el7, kernel-abi-whitelists 3.10.0-514.72.1.el7, +1 morefixed: vendor fix RHSA-2020:0178
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Red Hat Enterprise Linux Server TUS (v. 7.4) perf 3.10.0-693.64.1.el7, kernel 3.10.0-693.64.1.el7, python-perf 3.10.0-693.64.1.el7, kernel-tools 3.10.0-693.64.1.el7, kernel-tools-libs 3.10.0-693.64.1.el7, kernel-abi-whitelists 3.10.0-693.64.1.el7, +1 morefixed: vendor fix RHSA-2020:0592
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Red Hat MRG Realtime for RHEL 6 Server v.2 kernel-rt 3.10.0-693.64.1.rt56.662.el6rt, kernel-rt-trace 3.10.0-693.64.1.rt56.662.el6rt, kernel-rt-vanilla 3.10.0-693.64.1.rt56.662.el6rt, kernel-rt-firmware 3.10.0-693.64.1.rt56.662.el6rt, kernel-rt-debuginfo-common-x86_64 3.10.0-693.64.1.rt56.662.el6rtfixed: vendor fix RHSA-2020:0609
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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 perf, kernel, bpftool, kernel-rt, kernel-alt, python-perf, +9 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 morenot 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
0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 7.8 | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 4.6 | AV:L/AC:L/Au:N/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-416 Use After Free
- Technology feeds
References
-
git.kernel.org
/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c9fbd7bbc23dbdd73364be4d045e5d3612cf6e82
patch, vendor-advisory
-
lists.opensuse.org
/opensuse-security-announce/2019-09/msg00064.html
vendor-advisory
-
lists.opensuse.org
/opensuse-security-announce/2019-09/msg00066.html
vendor-advisory
-
usn.ubuntu.com
/4144-1/
vendor-advisory
-
usn.ubuntu.com
/4145-1/
vendor-advisory
-
access.redhat.com
/errata/RHSA-2020:0178
vendor-advisory
-
access.redhat.com
/errata/RHSA-2020:0543
vendor-advisory
-
access.redhat.com
/errata/RHSA-2020:0592
vendor-advisory
-
access.redhat.com
/errata/RHSA-2020:0609
vendor-advisory
-
access.redhat.com
/errata/RHSA-2020:0661
vendor-advisory
- security.netapp.com /advisory/ntap-20190905-0002/
-
lists.debian.org
/debian-lts-announce/2019/09/msg00025.html
mailing-list
- support.f5.com /csp/article/K10269585?utm_source=f5support&%3Butm_medium=RSS
- packetstormsecurity.com /files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html
-
seclists.org
/bugtraq/2019/Nov/11
mailing-list
- packetstormsecurity.com /files/155212/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html
-
lists.debian.org
/debian-lts-announce/2020/03/msg00001.html
mailing-list
Sources
- CVE List CVE-2018-20976
- NVD CVE-2018-20976
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.