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Fencer Vulns
high 7.0

CVE-2020-11884 json

In the Linux kernel 4.19 through 5.6.7 on the s390 platform, code execution may occur because of a race condition, as demonstrated by code…

published 2020-04-29 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-4223

cvss
7.0
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

In the Linux kernel 4.19 through 5.6.7 on the s390 platform, code execution may occur because of a race condition, as demonstrated by code in enable_sacf_uaccess in arch/s390/lib/uaccess.c that fails to protect against a concurrent page table upgrade, aka CID-3f777e19d171. A crash could also occur.

Patch / fix

  • linux linux_kernel 4.19.119, 5.4.36, 5.6.8
  • linux Debian 14, Debian 13, Debian 12 5.6.7-1

debian advisories DEBIAN-CVE-2020-11884

  • linux Ubuntu 18.04 LTS 4.15.0-99.100
  • linux Ubuntu 20.04 LTS 5.4.0-28.32
  • linux-hwe Ubuntu 16.04 LTS 4.15.0-99.100~16.04.1
  • linux-hwe Ubuntu 18.04 LTS 5.3.0-51.44~18.04.2
  • linux-aws-5.3 Ubuntu 18.04 LTS 5.3.0-1019.21~18.04.1
  • linux-azure-4.15 Ubuntu 18.04 LTS 4.15.0-1083.93
  • linux-fips Ubuntu Pro FIPS-updates 18.04 LTS 4.15.0-1029.34
  • linux-aws-fips Ubuntu Pro FIPS-updates 18.04 LTS 4.15.0-2018.18

ubuntu advisories UBUNTU-CVE-2020-11884

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 RHEL 8 4.18.0-193.1.2.el8_2
  • perf RHEL 8 4.18.0-193.1.2.el8_2
  • bpftool RHEL 8 4.18.0-193.1.2.el8_2
  • kernel-core RHEL 8 4.18.0-193.1.2.el8_2
  • kernel-tools RHEL 8 4.18.0-193.1.2.el8_2
  • python3-perf RHEL 8 4.18.0-193.1.2.el8_2
  • kernel-modules RHEL 8 4.18.0-193.1.2.el8_2
  • kernel-zfcpdump RHEL 8 4.18.0-193.1.2.el8_2

red hat advisories RHSA-2020:2429RHSA-2020:2199RHSA-2020:2102

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-2020-11884 updated cvss 7.0

Kernel: s390: page table upgrade in secondary address mode may lead to privilege escalation

  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-193.1.2.el8_2, kernel-debuginfo-common-aarch64 4.18.0-193.1.2.el8_2, kernel-debuginfo-common-ppc64le 4.18.0-193.1.2.el8_2
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:2102
  • Red Hat CodeReady Linux Builder EUS (v. 8.1) kernel-debuginfo-common-x86_64 4.18.0-147.13.2.el8_1, kernel-debuginfo-common-aarch64 4.18.0-147.13.2.el8_1, kernel-debuginfo-common-ppc64le 4.18.0-147.13.2.el8_1
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:2199
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-193.1.2.el8_2, kernel 4.18.0-193.1.2.el8_2, bpftool 4.18.0-193.1.2.el8_2, kernel-core 4.18.0-193.1.2.el8_2, kernel-tools 4.18.0-193.1.2.el8_2, python3-perf 4.18.0-193.1.2.el8_2, +15 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:2102
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.0) perf 4.18.0-80.23.2.el8_0, kernel 4.18.0-80.23.2.el8_0, bpftool 4.18.0-80.23.2.el8_0, kernel-core 4.18.0-80.23.2.el8_0, kernel-tools 4.18.0-80.23.2.el8_0, python3-perf 4.18.0-80.23.2.el8_0, +9 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:2429
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.1) perf 4.18.0-147.13.2.el8_1, kernel 4.18.0-147.13.2.el8_1, bpftool 4.18.0-147.13.2.el8_1, kernel-core 4.18.0-147.13.2.el8_1, kernel-tools 4.18.0-147.13.2.el8_1, python3-perf 4.18.0-147.13.2.el8_1, +15 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:2199
  • 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 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +6 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

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
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.