Kernel crash via stale SCTP listen state
Published Oct 21, 2024 · Updated May 12, 2026
A NULL pointer dereference in the Linux kernel SCTP listener allows local users to crash affected systems through repeated listen calls. When sctp_autobind() fails, sctp_listen_start() leaves sk_state as LISTENING; a later listen with SCTP_REUSE_PORT dereferences a NULL bind_hash. Exploitation requires local low-privileged access, an autobind failure, and SCTP_REUSE_PORT, and the documented consequence is a kernel crash.
Summary
What happened
A NULL pointer dereference in the Linux kernel SCTP listener allows local users to crash affected systems through repeated listen calls. When sctp_autobind() fails, sctp_listen_start() leaves sk_state as LISTENING; a later listen with SCTP_REUSE_PORT dereferences a NULL bind_hash. Exploitation requires local low-privileged access, an autobind failure, and SCTP_REUSE_PORT, and the documented consequence is a kernel crash.
The record
- CVE
- CVE-2024-49944
- Published
- Oct 21, 2024
- Updated
- May 12, 2026
- Vendor
- Siemens
- Product
- SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
- Classifications
- CWE-476, T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 21, 2024CVE publishedPublication date reported by the CVE source.
- May 12, 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=0 <V3.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Public exploit references
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Technologies
Your stack
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Your stack
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