Kernel memory corruption via oversized encrypted SMB request
Published Nov 7, 2024 · Updated Aug 5, 2026
Out-of-bounds write in the Linux CIFS client allows local users to corrupt kernel memory through an encrypted SMB mount. SMB2_ioctl_init allocates 448 bytes for the first request vector, but smb2_set_next_command copies an input longer than 328 bytes into that allocation while flattening an encrypted compound request. Reachability requires a writable encrypted CIFS mount and an oversized symlink target; the published reproducer demonstrates a KASAN-detected slab overwrite, not code execution.
Summary
What happened
Out-of-bounds write in the Linux CIFS client allows local users to corrupt kernel memory through an encrypted SMB mount. SMB2_ioctl_init allocates 448 bytes for the first request vector, but smb2_set_next_command copies an input longer than 328 bytes into that allocation while flattening an encrypted compound request. Reachability requires a writable encrypted CIFS mount and an oversized symlink target; the published reproducer demonstrates a KASAN-detected slab overwrite, not code execution.
The record
- CVE
- CVE-2024-50151
- Published
- Nov 7, 2024
- Updated
- Aug 5, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 7, 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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- Affected versionversion=0 <*
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Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
- Linux kernel CVE announcement reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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