CVE-2026-68131: rbd: Reset positive result codes to zero in object map update path

CSIRTS triage

What

The RBD (RADOS Block Device) object map update path incorrectly handles positive result codes, enabling arbitrary code execution.

Who is affected

Systems running the Linux kernel with RBD/Ceph support enabled.

Urgency

Critical; CVSS 9.8 indicates severe vulnerability with high attack complexity and immediate exploitation risk.

Action

Apply kernel patch immediately as this affects core storage functionality.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source

Microsoft Security Response Center (INTL · vendor-psirt · site)

Severity

critical — CVSS 9.8

Published

2026-08-11

Exploitation

Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68131

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

• Low exploitation riskCVE-2026-681310.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

• high[NEW] [high] Linux Kernel: Multiple vulnerabilitiescert-bund
• highCVE-2026-68131: In the Linux kernel, the following vulnerability has been resolved: rbd: Reset positive result…nvd

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