Service interruption via uninitialized RDMA qkey read
Published Oct 1, 2025 · Updated May 23, 2026
Use of uninitialized memory in Linux kernel RDMA/CMA allows local users to interrupt service via a crafted UCMA multicast join. cma_iboe_join_multicast leaves ib->rec.qkey uninitialized for some UD-compatible port spaces, and cma_set_qkey later reads it while constructing the multicast event. Low-privileged local access to UCMA is required; the published assessment reports availability impact without confidentiality or integrity impact.
Summary
What happened
Use of uninitialized memory in Linux kernel RDMA/CMA allows local users to interrupt service via a crafted UCMA multicast join. cma_iboe_join_multicast leaves ib->rec.qkey uninitialized for some UD-compatible port spaces, and cma_set_qkey later reads it while constructing the multicast event. Low-privileged local access to UCMA is required; the published assessment reports availability impact without confidentiality or integrity impact.
The record
- CVE
- CVE-2023-53525
- Published
- Oct 1, 2025
- Updated
- May 23, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 1, 2025CVE 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=5.10
- Affected versionversion=5.8.17 <5.9
- Affected versionversion=5.9.2 <5.10
- Affected versionversion=b5de0c60cc30c2a3513c7188c73f3f29acc29234 <02eabb635bc64bd1e3a7cf887d6d182bffb64b99
- Affected versionversion=b5de0c60cc30c2a3513c7188c73f3f29acc29234 <48e8e7851dc0b1584d83817a78fc7108c8904b54
- Affected versionversion=b5de0c60cc30c2a3513c7188c73f3f29acc29234 <58e84f6b3e84e46524b7e5a916b53c1ad798bc8f
- Affected versionversion=b5de0c60cc30c2a3513c7188c73f3f29acc29234 <ae11498851423d6de27aebfe12a5ee85060ab1d5
- Affected versionversion=b5de0c60cc30c2a3513c7188c73f3f29acc29234 <bb18b9dbac2bbdf7695e0bfaac4bf944ff7b207d
- Affected versionversion=b8d1adbff983be0b54f61c9a4169609d7fab0620
- Affected versionversion=feed39c8d1282279fcb30612aa0e8d2635c11280
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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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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