What’s Vulnerable › Vulnerabilities

CVE-2020-11884

• Severity: high (CVSS 7.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-04-29 · updated 2026-06-17
• Weakness: CWE-362

Description

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.

Affected products

• Canonical Ubuntu Linux: 16.04, 18.04, 19.10, 20.04
• Debian Linux: 10.0
• Fedoraproject Fedora: 30, 31, 32
• Linux kernel: from 4.15 before 4.19.119; from 4.20 before 5.4.36; from 5.5 before 5.6.8 — fixed in 4.19.119, 5.4.36, 5.6.8
• NetApp A700S Firmware: all versions
• Active IQ Unified Manager for VMware vSphere, Linux, and Microsoft Windows: all versions
• NetApp Bootstrap Os: all versions
• NetApp Cloud Backup: all versions
• NetApp Element Software: all versions
• NetApp H300E Firmware: all versions
• NetApp H300S Firmware: all versions
• NetApp H410C Firmware: all versions
• NetApp H410S Firmware: all versions
• NetApp H500E Firmware: all versions
• NetApp H500S Firmware: all versions
• NetApp H610C Firmware: all versions
• NetApp H610S Firmware: all versions
• NetApp H700E Firmware: all versions
• NetApp H700S Firmware: all versions
• NetApp Hci Management Node: all versions
• NetApp Solidfire: all versions
• NetApp Solidfire Baseboard Management Controller: all versions
• NetApp Steelstore Cloud Integrated Storage: all versions

How to fix

Upgrade to a fixed version: Linux kernel 4.19.119, 5.4.36, 5.6.8. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=215d1f3928713d6eaec67244bcda72105b898000
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3f777e19d171670ab558a6d5e6b1ac7f9b6c574f
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3TZBP2HINNAX7HKHCOUMIFVQPV6GWMCZ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AQUVKC3IPUC5B374VVAZV4J5P3GAUGSW/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZKVJMS4GQRH5SO35WM5GINCFAGXQ3ZW6/
• https://security.netapp.com/advisory/ntap-20200608-0001/
• https://usn.ubuntu.com/4342-1/
• https://usn.ubuntu.com/4343-1/
• https://usn.ubuntu.com/4345-1/
• https://www.debian.org/security/2020/dsa-4667
• https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=215d1f3928713d6eaec67244bcda72105b898000
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3f777e19d171670ab558a6d5e6b1ac7f9b6c574f

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