Resource exhaustion via deferred-close reference leaks
Published Aug 10, 2026 · Updated Aug 10, 2026
Resource leakage in the CIFS client in Linux allows local users to exhaust resources through failed deferred-close allocations. After cancel_delayed_work removes the pending cleanup, a failed kmalloc_obj call breaks the drain loop without adding cifsFileInfo to file_head or releasing its reference and server handle. A CIFS/SMB client mount and low-privileged local access are required; repeated leaks can deplete memory or open server handles and interrupt service.
Summary
What happened
Resource leakage in the CIFS client in Linux allows local users to exhaust resources through failed deferred-close allocations. After cancel_delayed_work removes the pending cleanup, a failed kmalloc_obj call breaks the drain loop without adding cifsFileInfo to file_head or releasing its reference and server handle. A CIFS/SMB client mount and low-privileged local access are required; repeated leaks can deplete memory or open server handles and interrupt service.
The record
- CVE
- CVE-2026-68312
- Published
- Aug 10, 2026
- Updated
- Aug 10, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-911, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 10, 2026CVE publishedPublication date reported by the CVE source.
- Aug 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=5.15
- Affected versionversion=e3fc065682ebbbd15b0ce0036800f4acbf765d46 <32390b3f06f26e366cfb27dbac4bc0196c321535
- Affected versionversion=e3fc065682ebbbd15b0ce0036800f4acbf765d46 <c2f2e83e3bbc5483730fd4ee903182761f1ae50f
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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