Kernel-memory disclosure via uninitialized cpumap metadata
Published May 17, 2024 · Updated Aug 5, 2026
Use of uninitialized memory in the Linux kernel cpumap code allows local users to read stale kernel data through XDP metadata. When a cpumap-attached XDP program runs, kernel/bpf/cpumap.c passes an uninitialized xdp_rxq_info through xdp_buff, exposing its contents as xdp_md->rx_queue_index. The disclosed behavior requires local low-privileged access and a cpumap-attached XDP program; the concrete published impact is kernel-memory disclosure.
Summary
What happened
Use of uninitialized memory in the Linux kernel cpumap code allows local users to read stale kernel data through XDP metadata. When a cpumap-attached XDP program runs, kernel/bpf/cpumap.c passes an uninitialized xdp_rxq_info through xdp_buff, exposing its contents as xdp_md->rx_queue_index. The disclosed behavior requires local low-privileged access and a cpumap-attached XDP program; the concrete published impact is kernel-memory disclosure.
The record
- CVE
- CVE-2024-27431
- Published
- May 17, 2024
- Updated
- Aug 5, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-908, T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 17, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=0 <*
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What is affected?
Published CVSS scores
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Attacks
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Public exploit references
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Technologies
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Your stack
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