CVE-2021-1048

CRITICALNVD 7.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-05-23), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 1%CVSS: 7.8Exploit: cisa kev · ssvc activeExposed: 0

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

In ep_loop_check_proc of eventpoll.c, there is a possible way to corrupt memory due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-204573007References: Upstream kernel

CVSS v3
7.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
61%
KEV
⚠ Exploited

Published

December 15, 2021

Last Modified

October 23, 2025

Advisory Details (2)

Auto-updated Jun 4, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1048
generic

Android Security Bulletin—November 2021  |  Android Open Source Project

https://source.android.com/security/bulletin/2021-11-01

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux—5.8.10-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—5.8.10-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—5.8.10-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—5.8.10-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 66× in last 7d / 275× 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 1,042 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2021-1048?
CVE-2021-1048 is a critical vulnerability published on December 15, 2021. In eploopcheck_proc of eventpoll.c, there is a possible way to corrupt memory due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID:…
When was CVE-2021-1048 disclosed?
CVE-2021-1048 was first published in the National Vulnerability Database on December 15, 2021, with the most recent update on October 23, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-1048 actively exploited?
Yes. CISA added CVE-2021-1048 to the Known Exploited Vulnerabilities catalog on May 23, 2022, affecting Android Kernel. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-1048?
CVE-2021-1048 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2021-1048?
CVE-2021-1048 affects Android Kernel. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2021-1048?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-1048, 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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