CVE-2020-9391

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Source
https://cve.org/CVERecord?id=CVE-2020-9391
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-9391.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2020-9391
Downstream
Related
Published
2020-02-25T18:15:11.647Z
Modified
2026-03-15T14:40:47.603959Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
219d54332a09e8d8741c1e1982f5eae56099de85
Fixed
dcde237319e626d1ec3c9d8b7613032f0fd4663a
Database specific 
{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "5.4"
        }
    ]
}

Database specific

unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "5.5"
            },
            {
                "last_affected": "5.5.6"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "31"
            }
        ]
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-9391.json"