CVE-2026-52991: sched/psi: fix race between file release and pressure write
CSIRTS triage
- What
- A race condition exists between file release and pressure write in the sched/psi subsystem.
- Who is affected
- Deployments using the sched/psi subsystem in their scheduling configuration.
- Urgency
- Remediation is critical due to the critical severity rating, indicating a high risk of privilege escalation.
- Action
- Implement the patches for the sched/psi subsystem immediately.
AI-assisted analysis generated from the source advisory — verify against the original.
Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-52991
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-2026-529910.10% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-52991 | coverage & exploitation status | NVD · CVE.org |
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