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CVE-2024-35864: smb: client: fix potential UAF in smb2_is_valid_lease_break()

highCVSS 7.8CVE-2024-35864

CSIRTS triage

vendor: Linuxproduct: Linux kernelMemory corruption
What
A use-after-free vulnerability in smb2_is_valid_lease_break() in the SMB client code may allow memory corruption.
Who is affected
Systems with active SMB client connections processing lease break notifications.
Urgency
High severity (CVSS 7.8) potential for arbitrary code execution via memory corruption.
Action
Apply kernel patch adding proper lifecycle management in smb2_is_valid_lease_break().

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
high — CVSS 7.8
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-35864

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2024-35864coverage & exploitation statusNVD · CVE.org

Recent advisories for smb

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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