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Δ / VULNERABILITY RECORD

CVE-2025-21631.

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

block, bfq: fix waker_bfqq UAF after bfq_split_bfqq()

Source-reported weakness categories

CWE-416

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-Jan

Open original source · Updated Aug 12, 2026

block, bfq: fix waker_bfqq UAF after bfq_split_bfqq()

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 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)
Microsoft update guidecbl2 kernel 5.15.180.1-1 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guideazl3 kernel 6.6.76.1-1 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 guideazl3 kernel 6.6.64.2-9 on Azure Linux 3.0 (MSRC status code 3)

Vendor remediation references

  • CBL-Mariner Releases · build 5.15.180.1-1 · product IDs 17099-17086, 17099-21692, 17095-16823, 19705-17086
  • Vendor guidance · product IDs 17099-17086, 17099-21692, 17095-16823, 19705-17086
  • CBL-Mariner Releases · build 6.6.76.1-1 · product IDs 17476-17084, 17501-17084
  • Vendor guidance · product IDs 17476-17084, 17501-17084

Original records & references

PUBLISHED 2025-03-13T20:00:00-04:00
MODIFIED 2026-08-12T18:29:51-04:00
INGESTED 2026-10-08T12:50:16-04:00