CVE-2026-28529

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-03-25. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
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: Elevated riskExposed: 0

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

cryptodev-linux version 1.14 and prior contain a page reference handling flaw in the get_userbuf function of the /dev/crypto device driver that allows local users to trigger use-after-free conditions. Attackers with access to the /dev/crypto interface can repeatedly decrement reference counts of controlled pages to achieve local privilege escalation.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
51(Track*)
EG Risk 51/100SSVC: 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%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

March 25, 2026

Last Modified

August 17, 2026

Advisory Details (4)

Auto-updated Jul 14, 2026
No patch confirmed yet. Sources: github_pr.
generic

cryptodev-linux <= 1.14 get_userbuf Use After Free LPE | Advisories | VulnCheck

https://www.vulncheck.com/advisories/cryptodev-linux-get-userbuf-use-after-free-lpe
generic

[Cryptodev-linux] Page-level UAF exploitation - nasm.re

https://nasm.re/posts/cryptodev-linux-vuln/
github_pr

Fix: UAF in crypto_run + limit allocation size in adjust_sg_array

Upstream fix in progress (PR #104 · cryptodev-linux/cryptodev-linux, state=open)

https://github.com/cryptodev-linux/cryptodev-linux/pull/104
generic

LPE exploit for a bug I found in cryptodev-linux, meant to work against linux 6.15.4. It is essentially using struct file spraying to add a root user to /etc/passwd. · GitHub

https://gist.github.com/n4sm/0fd2479e0c23e0fa2f192cd8fda45750

Vendor Advisories for CVE-2026-28529(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 48× 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 107 total refreshes for this CVE.

  1. 2026-09-04 07:46 UTCOSV refresh
  2. 2026-09-04 05:06 UTCEPSS rescore
  3. 2026-09-01 04:39 UTCEPSS rescore
  4. 2026-09-01 04:39 UTCEPSS rescore
  5. 2026-08-30 19:17 UTCEPSS rescore
  6. 2026-08-30 01:22 UTCEPSS rescore
  7. 2026-08-28 21:41 UTCEPSS rescore
  8. 2026-08-27 14:25 UTCEPSS rescore
  9. 2026-08-26 14:46 UTCEPSS rescore
  10. 2026-08-25 13:49 UTCEPSS rescore
  11. 2026-08-24 14:17 UTCEPSS rescore
  12. 2026-08-21 23:49 UTCEPSS rescore
  13. 2026-08-20 22:55 UTCEPSS rescore
  14. 2026-08-20 22:55 UTCEPSS rescore
  15. 2026-08-19 17:03 UTCEPSS rescore
  16. 2026-08-18 13:48 UTCEPSS rescore
  17. 2026-08-17 18:53 UTCEG score recompute▼ 0.70
  18. 2026-08-17 18:53 UTCGHSA enrichment
  19. 2026-08-17 18:05 UTCNVD updateCVSS v3 → 7.8
  20. 2026-08-17 13:47 UTCEPSS rescore
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 10:23 UTCEG score recompute
  23. 2026-08-16 10:23 UTCGHSA enrichment
  24. 2026-08-16 02:14 UTCEPSS rescore
  25. 2026-08-15 01:30 UTCEPSS rescore
Show 75 more
  1. 2026-08-14 19:34 UTCGHSA enrichment
  2. 2026-08-14 06:42 UTCEG score recompute
  3. 2026-08-14 06:42 UTCGHSA enrichment
  4. 2026-08-13 22:00 UTCEPSS rescore
  5. 2026-08-12 20:57 UTCEG score recompute
  6. 2026-08-12 20:57 UTCGHSA enrichment
  7. 2026-08-12 13:50 UTCEPSS rescore
  8. 2026-08-11 21:00 UTCGHSA enrichment
  9. 2026-08-11 04:03 UTCEG score recompute
  10. 2026-08-11 04:03 UTCGHSA enrichment
  11. 2026-08-11 00:00 UTCEPSS rescore
  12. 2026-08-10 06:45 UTCGHSA enrichment
  13. 2026-08-09 18:30 UTCEG score recompute
  14. 2026-08-09 18:30 UTCGHSA enrichment
  15. 2026-08-09 13:46 UTCEPSS rescore
  16. 2026-08-09 06:15 UTCEG score recompute
  17. 2026-08-09 06:15 UTCGHSA enrichment
  18. 2026-08-08 16:37 UTCEPSS rescore
  19. 2026-08-08 04:49 UTCGHSA enrichment
  20. 2026-08-07 16:34 UTCGHSA enrichment
  21. 2026-08-06 19:00 UTCEG score recompute
  22. 2026-08-06 19:00 UTCGHSA enrichment
  23. 2026-08-06 13:46 UTCEPSS rescore
  24. 2026-08-06 01:03 UTCEG score recompute
  25. 2026-08-06 01:03 UTCGHSA enrichment
  26. 2026-08-05 19:17 UTCEPSS rescore
  27. 2026-08-03 23:50 UTCEG score recompute
  28. 2026-08-03 23:50 UTCGHSA enrichment
  29. 2026-08-03 10:36 UTCEPSS rescore
  30. 2026-08-02 15:37 UTCEG score recompute
  31. 2026-08-02 15:37 UTCGHSA enrichment
  32. 2026-08-02 02:26 UTCEPSS rescore
  33. 2026-08-01 19:36 UTCOSV refresh
  34. 2026-08-01 04:16 UTCEPSS rescore
  35. 2026-07-30 16:27 UTCEPSS rescore
  36. 2026-07-28 15:36 UTCEPSS rescore
  37. 2026-07-26 14:54 UTCEPSS rescore
  38. 2026-07-26 14:54 UTCEPSS rescore
  39. 2026-07-25 14:18 UTCEPSS rescore
  40. 2026-07-25 14:17 UTCEPSS rescore
  41. 2026-07-24 14:17 UTCEPSS rescore
  42. 2026-07-23 14:18 UTCEPSS rescore
  43. 2026-07-23 14:18 UTCEPSS rescore
  44. 2026-07-23 03:08 UTCEG score recompute
  45. 2026-07-22 14:08 UTCEPSS rescore
  46. 2026-07-22 14:08 UTCEPSS rescore
  47. 2026-07-21 15:24 UTCEPSS rescore
  48. 2026-07-21 15:24 UTCEPSS rescore
  49. 2026-07-20 17:08 UTCEPSS rescore
  50. 2026-07-20 17:08 UTCEPSS rescore
  51. 2026-07-19 14:31 UTCEPSS rescore
  52. 2026-07-19 14:31 UTCEPSS rescore
  53. 2026-07-18 10:04 UTCEPSS rescore
  54. 2026-07-18 10:04 UTCEPSS rescore
  55. 2026-07-16 17:03 UTCEPSS rescore
  56. 2026-07-16 17:03 UTCEPSS rescore
  57. 2026-07-15 16:57 UTCEPSS rescore
  58. 2026-07-15 16:57 UTCEPSS rescore
  59. 2026-07-15 02:49 UTCOSV refresh
  60. 2026-07-13 22:30 UTCEPSS rescore
  61. 2026-07-13 06:13 UTCEPSS rescore
  62. 2026-07-13 06:13 UTCEPSS rescore
  63. 2026-07-11 08:27 UTCEPSS rescore
  64. 2026-07-09 19:10 UTCEPSS rescore
  65. 2026-07-08 15:15 UTCEPSS rescore
  66. 2026-07-07 13:46 UTCEPSS rescore
  67. 2026-07-06 16:27 UTCEPSS rescore
  68. 2026-07-06 16:27 UTCEPSS rescore
  69. 2026-07-06 02:23 UTCEPSS rescore
  70. 2026-07-06 02:23 UTCEPSS rescore
  71. 2026-07-05 02:30 UTCEPSS rescore
  72. 2026-07-04 06:31 UTCEPSS rescore
  73. 2026-06-30 23:22 UTCEPSS rescore
  74. 2026-06-30 23:22 UTCEPSS rescore
  75. 2026-06-29 14:06 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-28529?
CVE-2026-28529 is a high vulnerability published on March 25, 2026. cryptodev-linux version 1.14 and prior contain a page reference handling flaw in the get_userbuf function of the /dev/crypto device driver that allows local users to trigger use-after-free conditions. Attackers with access to the /dev/crypto interface can repeatedly decrement reference counts of…
When was CVE-2026-28529 disclosed?
CVE-2026-28529 was first published in the National Vulnerability Database on March 25, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28529 actively exploited?
CVE-2026-28529 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 93.0% of all scored CVEs.
What is the CVSS score of CVE-2026-28529?
CVE-2026-28529 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-28529?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28529, 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.

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