CVE-2020-27171

MEDIUMNVD 6.06.0—
EchelonGraph scoreMEDIUM confidence

Score 6.0 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 6.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
6.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 6.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An 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.

CVSS v3
6.0
EG Score
6.0MEDIUMmedium confidence
EG Risk
27
EG Risk 27/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity60% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.6%
EPSS %ILE
45th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

March 20, 2021

Last Modified

October 8, 2026

Advisory Details (9)

Auto-updated Oct 9, 2026
Patch available.
generic

Packet Storm

http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
generic

oss-security - [CVE-2020-27171] Numeric error when restricting speculative pointer arithmetic allows unprivileged local users to leak content of kernel memory

https://www.openwall.com/lists/oss-security/2021/03/19/3
generic

[SECURITY] Fedora 32 Update: kernel-5.11.10-100.fc32 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T2S3I4SLRNRUQDOFYUS6IUAZMQNMPNLG/
generic

[SECURITY] Fedora 34 Update: kernel-5.11.8-300.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRTPQE73ANG7D6M4L4PK5ZQDPO4Y2FVD/
generic

[SECURITY] Fedora 33 Update: kernel-5.11.8-200.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FB6LUXPEIRLZH32YXWZVEZAD4ZL6SDK2/
genericMentions a patch (unverified)

[SECURITY] [DLA 2610-1] linux-4.19 security update

https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
generic
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/patch/?id=10d2bb2e6b1d8c4576c56a748f697dbeb8388899
generic
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8
generic

oss-security - Re: [CVE-2020-27171] Numeric error when restricting speculative pointer arithmetic allows unprivileged local users to leak content of kernel memory

http://www.openwall.com/lists/oss-security/2021/03/24/5

Vendor Advisories for CVE-2020-27171(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-image-virtual-hwe-20.04-edge (5.8.0.48.53) @ groovy2026-10-08ubuntu
ubuntulinux-image-virtual-hwe-16.04-edge (4.15.0.140.135) @ xenial2026-10-08ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.10.24-1: fixed in 5.10.24-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.10.24-1: fixed in 5.10.24-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.10.24-1: fixed in 5.10.24-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.10.24-1: fixed in 5.10.24-1
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
linux-4.194.19.132-1~deb9u1 ... 4.19.171-2~deb9u1 (6 versions)
  • every version up to 4.19.181-1~deb9u1: fixed in 4.19.181-1~deb9u1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 166 total refreshes for this CVE.

  1. 2026-10-09 20:04 UTCEPSS rescore
  2. 2026-10-08 21:24 UTCEG score recompute
  3. 2026-10-08 21:24 UTCVendor advisory
  4. 2026-10-08 21:24 UTCGHSA enrichment
  5. 2026-10-08 16:38 UTCEPSS rescore
  6. 2026-10-07 23:44 UTCEPSS rescore
  7. 2026-10-06 15:13 UTCEPSS rescore
  8. 2026-10-05 17:39 UTCEPSS rescore
  9. 2026-10-04 23:18 UTCEPSS rescore
  10. 2026-10-03 14:22 UTCEPSS rescore
  11. 2026-09-30 15:16 UTCEG score recompute
  12. 2026-09-30 14:59 UTCEPSS rescore
  13. 2026-09-29 15:14 UTCEPSS rescore
  14. 2026-09-27 13:41 UTCEPSS rescore
  15. 2026-09-26 15:54 UTCEPSS rescore
  16. 2026-09-26 15:54 UTCEPSS rescore
  17. 2026-09-24 14:00 UTCEPSS rescore
  18. 2026-09-22 14:43 UTCEPSS rescore
  19. 2026-09-21 20:28 UTCEPSS rescore
  20. 2026-09-20 20:11 UTCEPSS rescore
  21. 2026-09-20 03:20 UTCOSV refresh
  22. 2026-09-19 15:37 UTCEPSS rescore
  23. 2026-09-18 19:23 UTCEPSS rescore
  24. 2026-09-17 19:22 UTCEPSS rescore
  25. 2026-09-16 14:04 UTCEPSS rescore
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  1. 2026-09-15 03:06 UTCEPSS rescore
  2. 2026-09-13 16:43 UTCEPSS rescore
  3. 2026-09-12 14:57 UTCEPSS rescore
  4. 2026-09-11 09:32 UTCEPSS rescore
  5. 2026-09-08 21:56 UTCEPSS rescore
  6. 2026-09-07 15:57 UTCEPSS rescore
  7. 2026-09-06 13:44 UTCEPSS rescore
  8. 2026-09-05 15:24 UTCEPSS rescore
  9. 2026-09-04 13:57 UTCEPSS rescore
  10. 2026-09-04 05:03 UTCEPSS rescore
  11. 2026-09-02 14:08 UTCEPSS rescore
  12. 2026-09-01 06:53 UTCOSV refresh
  13. 2026-09-01 03:32 UTCEPSS rescore
  14. 2026-08-30 19:14 UTCEPSS rescore
  15. 2026-08-30 01:18 UTCEPSS rescore
  16. 2026-08-27 14:21 UTCEPSS rescore
  17. 2026-08-26 14:42 UTCEPSS rescore
  18. 2026-08-25 13:45 UTCEPSS rescore
  19. 2026-08-21 23:45 UTCEPSS rescore
  20. 2026-08-20 22:52 UTCEPSS rescore
  21. 2026-08-19 17:00 UTCEPSS rescore
  22. 2026-08-18 13:44 UTCEPSS rescore
  23. 2026-08-17 13:43 UTCEPSS rescore
  24. 2026-08-16 14:52 UTCEPSS rescore
  25. 2026-08-16 02:11 UTCEPSS rescore
  26. 2026-08-15 06:37 UTCOSV refresh
  27. 2026-08-15 01:26 UTCEPSS rescore
  28. 2026-08-13 21:57 UTCEPSS rescore
  29. 2026-08-12 13:47 UTCEPSS rescore
  30. 2026-08-09 13:43 UTCEPSS rescore
  31. 2026-08-08 16:33 UTCEPSS rescore
  32. 2026-08-07 16:23 UTCEPSS rescore
  33. 2026-08-06 13:43 UTCEPSS rescore
  34. 2026-08-04 15:06 UTCEPSS rescore
  35. 2026-08-04 10:34 UTCEPSS rescore
  36. 2026-08-02 02:23 UTCEPSS rescore
  37. 2026-08-01 04:12 UTCEPSS rescore
  38. 2026-07-30 18:21 UTCOSV refresh
  39. 2026-07-30 16:25 UTCEPSS rescore
  40. 2026-07-30 01:27 UTCEPSS rescore
  41. 2026-07-28 15:33 UTCEPSS rescore
  42. 2026-07-26 14:51 UTCEPSS rescore
  43. 2026-07-25 14:15 UTCEPSS rescore
  44. 2026-07-24 14:14 UTCEPSS rescore
  45. 2026-07-23 14:15 UTCEPSS rescore
  46. 2026-07-23 14:15 UTCEPSS rescore
  47. 2026-07-23 01:52 UTCEG score recompute
  48. 2026-07-22 22:38 UTCEG score recompute
  49. 2026-07-22 14:05 UTCEPSS rescore
  50. 2026-07-21 15:22 UTCEPSS rescore
  51. 2026-07-21 15:22 UTCEPSS rescore
  52. 2026-07-20 17:04 UTCEPSS rescore
  53. 2026-07-20 17:04 UTCEPSS rescore
  54. 2026-07-19 14:28 UTCEPSS rescore
  55. 2026-07-19 14:28 UTCEPSS rescore
  56. 2026-07-19 02:26 UTCEPSS rescore
  57. 2026-07-19 02:26 UTCEPSS rescore
  58. 2026-07-16 16:59 UTCEPSS rescore
  59. 2026-07-15 16:55 UTCEPSS rescore
  60. 2026-07-15 16:55 UTCEPSS rescore
  61. 2026-07-15 01:57 UTCEPSS rescore
  62. 2026-07-13 22:27 UTCEPSS rescore
  63. 2026-07-13 22:27 UTCEPSS rescore
  64. 2026-07-13 06:10 UTCEPSS rescore
  65. 2026-07-13 06:10 UTCEPSS rescore
  66. 2026-07-13 03:08 UTCOSV refresh
  67. 2026-07-12 05:44 UTCEPSS rescore
  68. 2026-07-11 08:25 UTCEPSS rescore
  69. 2026-07-11 08:25 UTCEPSS rescore
  70. 2026-07-09 19:07 UTCEPSS rescore
  71. 2026-07-08 15:12 UTCEPSS rescore
  72. 2026-07-07 13:43 UTCEPSS rescore
  73. 2026-07-06 16:25 UTCEPSS rescore
  74. 2026-07-06 16:25 UTCEPSS rescore
  75. 2026-07-06 02:21 UTCEPSS rescore

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2020-27171?
CVE-2020-27171 is a medium vulnerability published on March 20, 2021. An 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…
When was CVE-2020-27171 disclosed?
CVE-2020-27171 was first published on March 20, 2021, with the most recent update on October 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-27171 actively exploited?
CVE-2020-27171 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-27171?
CVE-2020-27171 has a CVSS v3 base score of 6.0 (NVD).
How do I remediate CVE-2020-27171?
A fix for CVE-2020-27171 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2020-27171 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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