Service interruption via incomplete RDMA cache cleanup
Published Oct 21, 2024 · Updated May 23, 2026
Improper cleanup in Linux kernel RDMA core allows remote authenticated users to trigger a kernel warning and service interruption. When ib_cache_update fails after gid_table_setup_one succeeds, ib_cache_setup_one returns without gid_table_cleanup_one, leaving GID-table state for release. Reachability requires low-privilege access capable of creating an RXE RDMA link and forcing the cache-update error; the demonstrated consequence is an availability-impacting kernel warning.
Summary
What happened
Improper cleanup in Linux kernel RDMA core allows remote authenticated users to trigger a kernel warning and service interruption. When ib_cache_update fails after gid_table_setup_one succeeds, ib_cache_setup_one returns without gid_table_cleanup_one, leaving GID-table state for release. Reachability requires low-privilege access capable of creating an RXE RDMA link and forcing the cache-update error; the demonstrated consequence is an availability-impacting kernel warning.
The record
- CVE
- CVE-2024-47693
- Published
- Oct 21, 2024
- Updated
- May 23, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 21, 2024CVE publishedPublication date reported by the CVE source.
- May 23, 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=1901b91f99821955eac2bd48fe25ee983385dc00 <1403c8b14765eab805377dd3b75e96ace8747aed
- Affected versionversion=1901b91f99821955eac2bd48fe25ee983385dc00 <1730d47d1865af89efd01cf0469a9a739cbf60f2
- Affected versionversion=1901b91f99821955eac2bd48fe25ee983385dc00 <290fe42fe0165205c4451334d8833a9202ae1d52
- Affected versionversion=1901b91f99821955eac2bd48fe25ee983385dc00 <45f63f4bb9a7128a6209d766c2fc02b3d42fbf3e
- Affected versionversion=1901b91f99821955eac2bd48fe25ee983385dc00 <af633fd9d9fff59e31c804f47ca0c8a784977773
- Affected versionversion=1901b91f99821955eac2bd48fe25ee983385dc00 <d08754be993f270e3d296d8f5d8e071fe6638651
- Affected versionversion=2a5968f266c7b9dc13917ac573af8d7b7da4023c
- Affected versionversion=5.4.42 <5.5
- Affected versionversion=5.6.14 <5.7
- Affected versionversion=5.7
- Affected versionversion=ee7ce7d7e7c76d5ec4c8067d32bbee9728dc9d29
What conditions does exploitation require?
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Attacks
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Weakness, pattern, technique
Public exploit references
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