Kernel-memory disclosure via uninitialized nexthop fields
Published Aug 17, 2024 · Updated May 12, 2026
Information disclosure in affected Linux kernels allows local users to read residual kernel bytes through nexthop-group netlink dumps. nla_put_nh_group() copies struct nexthop_grp entries without initializing the reserved resvd1 and resvd2 fields, so each dump returns stale bytes. Local access capable of creating and querying a nexthop group reaches the flaw; the disclosed data is limited to those reserved fields.
Summary
What happened
Information disclosure in affected Linux kernels allows local users to read residual kernel bytes through nexthop-group netlink dumps. nla_put_nh_group() copies struct nexthop_grp entries without initializing the reserved resvd1 and resvd2 fields, so each dump returns stale bytes. Local access capable of creating and querying a nexthop group reaches the flaw; the disclosed data is limited to those reserved fields.
The record
- CVE
- CVE-2024-42283
- Published
- Aug 17, 2024
- Updated
- May 12, 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
- Aug 17, 2024CVE publishedPublication date reported by the CVE source.
- May 12, 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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