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Δ / VULNERABILITY RECORD

CVE-2025-21887.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSHIGH / 7.8No severity score in this snapshot.
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSMicrosoft vendor recordModified Aug 12, 2026

Disclosure summary

ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

Microsoft Security Updates (CVRF) · 2025-Mar

Open original source · Updated Aug 12, 2026

ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up

Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.

Microsoft maximum product score: 7.8

VendorProduct / associationVersion / bounds
Microsoft update guideazl3 kernel 6.6.78.1-3 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guidecbl2 kernel 5.15.176.3-3 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guidecbl2 kernel 5.15.180.1-1 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guideazl3 kernel 6.6.82.1-1 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guidecbl2 kernel 5.15.176.3-3 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guidecbl2 kernel 5.15.176.3-3 on CBL-Mariner 2.0 (MSRC status code 3)

Vendor remediation references

  • CBL-Mariner Releases · build 6.6.82.1-1 · product IDs 17471-17084, 17465-17084
  • Vendor guidance · product IDs 17471-17084, 17465-17084
  • CBL-Mariner Releases · build 5.15.180.1-1 · product IDs 17099-17086, 17095-16823, 19705-17086, 17099-21692
  • Vendor guidance · product IDs 17099-17086, 17095-16823, 19705-17086, 17099-21692

Original records & references

PUBLISHED 2025-04-08T20:00:00-04:00
MODIFIED 2026-08-12T19:18:07-04:00
INGESTED 2026-10-08T12:50:09-04:00