What is CVE-2026-45839?

CVE-2026-45839 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. bpf: reject negative CO-RE accessor indices in bpf_core_parse_spec()

Which CVE IDs does CVE-2026-45839 cover?

CVE-2026-45839 covers the following CVE IDs: CVE-2026-45839. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-45839?

CVE-2026-45839 has a CVSS v3 base score of 7.1, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-45839?

CVE-2026-45839 affects 1 product, including: azl3 kernel 6.6.139.1-1 on Azure Linux 3.0.

CVE-2026-45839MediumCVSS 7.1

bpf: reject negative CO-RE accessor indices in bpf_core_parse_spec()

Vendor

Microsoft Security Response Center (MSRC)

Published

May 28, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-45839 →

🎯 Affected products1

azl3 kernel 6.6.139.1-1 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 6.6.141.1-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45839
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade