CVE-2020-27171

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Summary

CVECVE-2020-27171
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-03-20 22:15:12 UTC
Updated2026-10-08 21:17:27 UTC
DescriptionAn issue was discovered in the Linux kernel before 5.11.8. kernel/bpf/verifier.c has an off-by-one error (with a resultant integer underflow) affecting out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory, aka CID-10d2bb2e6b1d.

Risk And Classification

Primary CVSS: v3.1 6 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H

EPSS: 0.005770000 probability, percentile 0.458980000 (date 2026-10-10)

Problem Types: CWE-193 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary6MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H
2.0[email protected]Primary3.6AV:L/AC:L/Au:N/C:P/I:N/A:P

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
Partial

AV:L/AC:L/Au:N/C:P/I:N/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Canonical Ubuntu Linux 14.04 All All All
Operating System Canonical Ubuntu Linux 16.04 All All All
Operating System Canonical Ubuntu Linux 18.04 All All All
Operating System Canonical Ubuntu Linux 20.04 All All All
Operating System Debian Debian Linux 9.0 All All All
Operating System Fedoraproject Fedora 32 All All All
Operating System Fedoraproject Fedora 33 All All All
Operating System Fedoraproject Fedora 34 All All All
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Kernel Live Patch Security Notice LSN-0075-1 ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com Third Party Advisory, VDB Entry
cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8 af854a3a-2127-422b-91ae-364da2661108 cdn.kernel.org Patch, Vendor Advisory
[SECURITY] Fedora 34 Update: kernel-5.11.8-300.fc34 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/patch af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch, Vendor Advisory
[SECURITY] Fedora 32 Update: kernel-5.11.10-100.fc32 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
oss-security - [CVE-2020-27171] Numeric error when restricting speculative pointer arithmetic allows unprivileged local users to leak content of kernel memory af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Patch, Third Party Advisory
[SECURITY] Fedora 33 Update: kernel-5.11.8-200.fc33 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
oss-security - Re: [CVE-2020-27171] Numeric error when restricting speculative pointer arithmetic allows unprivileged local users to leak content of kernel memory af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Third Party Advisory
[SECURITY] [DLA 2610-1] linux-4.19 security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
[SECURITY] Fedora 32 Update: kernel-5.11.10-100.fc32 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
[SECURITY] Fedora 33 Update: kernel-5.11.8-200.fc33 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
[SECURITY] Fedora 34 Update: kernel-5.11.8-300.fc34 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 159135 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2021-9140)
  • 159136 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel-container (ELSA-2021-9141)
  • 159179 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2021-9222)
  • 159180 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel-container (ELSA-2021-9223)
  • 174896 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1177-1)
  • 174897 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1175-1)
  • 174916 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1210-1)
  • 174917 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1211-1)
  • 174919 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1238-1)
  • 178507 Debian Security Update for linux-4.19 (DLA 2610-1)
  • 198307 Ubuntu Security Notification for Linux, Linux-aws, Linux-aws-5.4, Linux-azure, Linux-azure-5.4, Linux-gcp, (USN-4887-1)
  • 198309 Ubuntu Security Notification for Linux, Linux-aws, Linux-aws-hwe, Linux-azure, Linux-azure-4.15, (USN-4890-1)
  • 281069 Fedora Security Update for kernel (FEDORA-2021-e49da8a226)
  • 281407 Fedora Security Update for kernel (FEDORA-2021-9503fffad9)
  • 281433 Fedora Security Update for kernel (FEDORA-2021-f0181b8085)
  • 281434 Fedora Security Update for kernel (FEDORA-2021-e49da8a226)
  • 352274 Amazon Linux Security Advisory for kernel: ALAS2-2021-1627
  • 610351 Google Pixel Android July 2021 Security Patch Missing
  • 610358 Google Android July 2021 Security Patch Missing for Huawei EMUI
  • 670416 EulerOS Security Update for kernel (EulerOS-SA-2021-1983)
  • 670438 EulerOS Security Update for kernel (EulerOS-SA-2021-2062)
  • 670449 EulerOS Security Update for kernel (EulerOS-SA-2021-2051)
  • 750004 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1573-1)
  • 750006 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1596-1)
  • 750015 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1624-1)
  • 750199 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:0758-1)
  • 750276 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:0532-1)
  • 750650 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1975-1)
  • 750652 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:1977-1)
  • 750762 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:1977-1)
  • 750766 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:1975-1)
  • 900100 CBL-Mariner Linux Security Update for kernel 5.10.52.1
  • 900305 CBL-Mariner Linux Security Update for kernel 5.10.57.1
  • 900320 CBL-Mariner Linux Security Update for kernel 5.10.60.1
  • 901643 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (6526-1)
  • 903400 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (3990)
  • 906022 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (3990-1)

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