Bug 2429108 (CVE-2025-68806)

Summary: CVE-2025-68806 kernel: ksmbd: Information disclosure via buffer validation error in Extended Attributes
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in ksmbd in the Linux kernel. The smb2_set_ea function, responsible for handling Extended Attributes (EA), contained a buffer validation error. This error occurred because the size of the null terminating character was incorrectly omitted during length calculations for EA Name. A remote attacker could exploit this vulnerability to potentially disclose sensitive information.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-01-13 16:07:16 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix buffer validation by including null terminator size in EA length

The smb2_set_ea function, which handles Extended Attributes (EA),
was performing buffer validation checks that incorrectly omitted the size
of the null terminating character (+1 byte) for EA Name.
This patch fixes the issue by explicitly adding '+ 1' to EaNameLength where
the null terminator is expected to be present in the buffer, ensuring
the validation accurately reflects the total required buffer size.
Comment 1 Jon Moroney 2026-01-14 22:46:34 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026011310-CVE-2025-68806-a2fb@gregkh/T