Kernel warning via duplicate CIFS server selection
Published Aug 8, 2024 · Updated Aug 5, 2026
Resource-accounting error in CIFS in Linux 6.10 allows attackers to trigger kernel warnings during multichannel SMB write retries. smb2_async_writev repeats the server selection already performed by cifs_prepare_write, so a retry can increment one server's in_flight counter and decrement another's. Reaching the defect requires a retried CIFS write subrequest to select a different server; the documented consequence is incorrect in-flight accounting and a kernel warning.
Summary
What happened
Resource-accounting error in CIFS in Linux 6.10 allows attackers to trigger kernel warnings during multichannel SMB write retries. smb2_async_writev repeats the server selection already performed by cifs_prepare_write, so a retry can increment one server's in_flight counter and decrement another's. Reaching the defect requires a retried CIFS write subrequest to select a different server; the documented consequence is incorrect in-flight accounting and a kernel warning.
The record
- CVE
- CVE-2024-42256
- Published
- Aug 8, 2024
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 8, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 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=3ee1a1fc39819906f04d6c62c180e760cd3a689d <b1d0a566769b6fb3795b5289fc1daf9e0638d97a
- Affected versionversion=3ee1a1fc39819906f04d6c62c180e760cd3a689d <de40579b903883274fe203865f29d66b168b7236
- Affected versionversion=6.10
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Technologies
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Your stack
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