Use-after-free via stale RDMA notification entry
Published Sep 11, 2026 · Updated Sep 11, 2026
A use-after-free in Linux 6.12 allows attackers to access a freed RDMA connection identifier during concurrent transport teardown. svc_rdma_free() destroys sc_cm_id before removing the transport's sc_rn notification entry, so ib_unregister_device can dispatch svc_rdma_xprt_done() through the stale entry. Reachability requires the svcrdma transport and a concurrent RDMA-device unregister walk; the public record identifies neither an attacker-controlled trigger nor an impact beyond invalid memory access.
Summary
What happened
A use-after-free in Linux 6.12 allows attackers to access a freed RDMA connection identifier during concurrent transport teardown. svc_rdma_free() destroys sc_cm_id before removing the transport's sc_rn notification entry, so ib_unregister_device can dispatch svc_rdma_xprt_done() through the stale entry. Reachability requires the svcrdma transport and a concurrent RDMA-device unregister walk; the public record identifies neither an attacker-controlled trigger nor an impact beyond invalid memory access.
The record
- CVE
- CVE-2026-89535
- Published
- Sep 11, 2026
- Updated
- Sep 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 11, 2026CVE publishedPublication date reported by the CVE source.
- Sep 11, 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=6.12
- Affected versionversion=c4de97f7c45434985e5dbf2d6ccc9eca676e37fe <4488e912973773d64368828acf3b8e39d93650ae
- Affected versionversion=c4de97f7c45434985e5dbf2d6ccc9eca676e37fe <9f2f5d0999364c7070306cd422d8babc2621070d
- Affected versionversion=c4de97f7c45434985e5dbf2d6ccc9eca676e37fe <cfca6eb3345ba4a23cf9a1153ad09bf19faabfc9
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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