Kernel crash via DEVMAP_HASH bucket overflow
Published Apr 17, 2024 · Updated Aug 5, 2026
Integer overflow in Linux kernel DEVMAP_HASH allows local users to crash affected 32-bit systems through a crafted BPF map. Bucket sizing rounds attacker-controlled max_entries to a power of two before validating overflow, causing an undefined 32-bit left shift. Exploitation requires a local account able to create and update BPF maps; the demonstrated arm32 path terminates the operating system.
Summary
What happened
Integer overflow in Linux kernel DEVMAP_HASH allows local users to crash affected 32-bit systems through a crafted BPF map. Bucket sizing rounds attacker-controlled max_entries to a power of two before validating overflow, causing an undefined 32-bit left shift. Exploitation requires a local account able to create and update BPF maps; the demonstrated arm32 path terminates the operating system.
The record
- CVE
- CVE-2024-26885
- Published
- Apr 17, 2024
- Updated
- Aug 5, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-119, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 17, 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=0 <*
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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