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CVE-2020-9391

Affected software6 products, listed below
Severity5.5 Medium CVSS 3.1 2 scores
WeaknessOut-of-bounds write (CWE-787)
Published25 Feb 2020
Updated17 Jun 2026

Description

An issue was discovered in the Linux kernel 5.4 and 5.5 through 5.5.6 on the AArch64 architecture. It ignores the top byte in the address passed to the brk system call, potentially moving the memory break downwards when the application expects it to move upwards, aka CID-dcde237319e6. This has been observed to cause heap corruption with the GNU C Library malloc implementation.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 6 years ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 0.52% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

5.5 MEDIUM v3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H NVD Primary published
CVSS 2.0 2.1 none AV:L/AC:L/Au:N/C:N/I:N/A:P NVD Primary

Affected software and releases

Products and versions

9 products, 10 version entries
SourceVendorProductSchemeAffected versions
nvd fedoraproject fedora generic 31
nvd linux linux kernel generic 5.4 · ≥ 5.5 and ≤ 5.5.6
nvd netapp active iq unified manager generic any version
nvd netapp cloud backup generic any version
nvd netapp data availability services generic any version
nvd netapp h410c firmware generic any version
nvd netapp hci management node generic any version
nvd netapp solidfire generic any version
nvd netapp steelstore cloud integrated storage generic any version

References

URLTags
http://www.openwall.com/lists/oss-security/2020/02/25/6 Exploit, Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1797052 Exploit, Issue Tracking, Patch, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dcde237319e626d1ec3c9d8b7613032f0fd4663a Mailing List, Patch, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/O4LH35HOPBJIKYHYFXMBBM75DN75PZHZ/
https://security.netapp.com/advisory/ntap-20200313-0003/ Third Party Advisory

Timeline

Published2020-02-25By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.