What’s Vulnerable › Vulnerabilities

CVE-2026-89531: svcrdma: Reject connection when transport allocation fails

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: svcrdma: Reject connection when transport allocation fails handle_connect_req() returns without action when svc_rdma_create_xprt() fails to allocate the new transport. The CM core returns 0 for CONNECT_REQUEST events, so it does not destroy the new rdma_cm_id. Each allocation failure under memory pressure leaks one rdma_cm_id, and a remote peer driving connection attempts can amplify this. Reject the connection by returning a non-zero status from the CM event handler, which tells the CM core to destroy the orphaned cm_id.

Affected products

• Linux: 2.6.25 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0944462247dcb7de7622cdaaadf5f05c52707dab
• https://git.kernel.org/stable/c/1f6a14c142fee4778c32709d1d54595c2e2b7991
• https://git.kernel.org/stable/c/387401ebe7f4897acd18321dc94817ad6a33f580
• https://git.kernel.org/stable/c/3cf372cec7ab2cd8c6002bf775cc14d90ccb098b
• https://git.kernel.org/stable/c/5bf47bbea3c22c0af2293b6c393ab04d5420f7ab
• https://git.kernel.org/stable/c/6e21754bbf75075f3fee1cebc79f3417364235ec

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