Unauthenticated host denial via unbounded SMB work queue
Published Nov 19, 2024 · Updated Aug 5, 2026
Resource exhaustion in Linux 5.15 and later allows remote attackers to cause host-wide denial of service via simultaneous SMB requests. Before authentication, queue_ksmbd_work creates a work object and attacker-sized request buffer for each accepted PDU without limiting outstanding work to the connection's credits. Exposure requires an active ksmbd listener on TCP port 445; a request pipeline can exhaust kernel memory, invoke the OOM condition, kill processes, and render the host unusable.
Summary
What happened
Resource exhaustion in Linux 5.15 and later allows remote attackers to cause host-wide denial of service via simultaneous SMB requests. Before authentication, queue_ksmbd_work creates a work object and attacker-sized request buffer for each accepted PDU without limiting outstanding work to the connection's credits. Exposure requires an active ksmbd listener on TCP port 445; a request pipeline can exhaust kernel memory, invoke the OOM condition, kill processes, and render the host unusable.
The record
- CVE
- CVE-2024-50285
- Published
- Nov 19, 2024
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 19, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <0a77d947f599b1f39065015bec99390d0c0022ee
- Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <1f993777275cbd8f74765c4f9d9285cb907c9be5
- Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <e257ac6fe138623cf59fca8898abdf659dbc8356
- Affected versionversion=5.15
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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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