CVE-2021-26934

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 73% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

An issue was discovered in the Linux kernel 4.18 through 5.10.16, as used by Xen. The backend allocation (aka be-alloc) mode of the drm_xen_front drivers was not meant to be a supported configuration, but this wasn't stated accordingly in its support status entry.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

February 17, 2021

Last Modified

November 21, 2024

References (8)

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 7.2~rc5-1~exp1 (496 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 7.2~rc5-1~exp1 (335 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.2~rc5-1~exp1 (160 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.2~rc5-1~exp1 (160 versions)——

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 35× 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 137 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2021-26934?
CVE-2021-26934 is a high vulnerability published on February 17, 2021. An issue was discovered in the Linux kernel 4.18 through 5.10.16, as used by Xen. The backend allocation (aka be-alloc) mode of the drmxenfront drivers was not meant to be a supported configuration, but this wasn't stated accordingly in its support status entry.
When was CVE-2021-26934 disclosed?
CVE-2021-26934 was first published in the National Vulnerability Database on February 17, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-26934 actively exploited?
CVE-2021-26934 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 72.2% of all scored CVEs.
What is the CVSS score of CVE-2021-26934?
CVE-2021-26934 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2021-26934?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-26934, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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