CVE-2020-9391

lowpriority · track · 22EPSS 0.005 · 44 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.52% (44th) EPSS

CVSS 2.1 · low

Is it mine?

15 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-28

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.

cvss

Technical severity, 0–10. One row per scoring source.

5.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.1–5.5

v2.02.1lowAV:L/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 3.9 · impact 2.9

v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 3.6

v3.15.5mediumAV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.15.1mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USprimaryCWE-119USCWE-787US

affected products (15)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
Fedora Project Fedora≤ 31fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition для «Эльбрус»≤ 8.1 «Ленинград»fstec_bduRU
Сообщество свободного программного обеспечения Linux5.4.0 → 5.4.22fstec_bduRU
Сообщество свободного программного обеспечения Linux5.5.0 → 5.5.6fstec_bduRU
fedoraproject fedora= 31nvdUScpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
linux linux kernel= 5.4nvdUScpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux kernel5.5 → 5.5.6nvdUScpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
netapp active iq unified managerall versionsnvdUScpe:2.3:a:netapp:active_iq_unified_manager:*:*:*:*:*:*:*:*
netapp cloud backupall versionsnvdUScpe:2.3:a:netapp:cloud_backup:*:*:*:*:*:*:*:*
netapp data availability servicesall versionsnvdUScpe:2.3:a:netapp:data_availability_services:*:*:*:*:*:*:*:*
netapp h410c firmwareall versionsnvdUScpe:2.3:o:netapp:h410c_firmware:*:*:*:*:*:*:*:*
netapp hci management nodeall versionsnvdUScpe:2.3:a:netapp:hci_management_node:*:*:*:*:*:*:*:*
netapp solidfireall versionsnvdUScpe:2.3:a:netapp:solidfire:*:*:*:*:*:*:*:*
netapp steelstore cloud integrated storageall versionsnvdUScpe:2.3:a:netapp:steelstore_cloud_integrated_storage:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2020-02-25modified 2026-06-17

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+16140 more

references (17)

External citations — patches, advisories, analysis.

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