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VULNERABILITIES

CVE-2020-9391 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://bugzilla.redhat.com/show_bug.cgi?id=1797052 CVEExploitIssue TrackingPatchThird Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dcde237319e626d1ec3c9d8b7613032f0fd4663a CVEMailing ListPatchVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/O4LH35HOPBJIKYHYFXMBBM75DN75PZHZ/ CVE
https://security.netapp.com/advisory/ntap-20200313-0003/ CVEThird Party Advisory
http://www.openwall.com/lists/oss-security/2020/02/25/6 CVEExploitMailing ListThird Party Advisory

see all 10 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-787Out-of-bounds Write[email protected]

Affected Products

ProductVersions

Change History

10 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2020-9391
NVD Published Date:
Feb 25, 2020
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]