CVE-2026-46280: lib: test_hmm: evict device pages on file close to avoid use-after-free

mediumCVSS 5.5CVE-2026-46280

CSIRTS triage

vendor: lib product: libOther

What: The vulnerability involves a use-after-free condition when evicting device pages on file close.
Who is affected: Deployments using the affected library.
Urgency: Remediation is medium urgency due to the potential for exploitation in specific scenarios.
Action: Update to the latest version of the library.

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

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-46280

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-2026-462800.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-46280	coverage & exploitation status	NVD · CVE.org

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