CVE-2026-98257
7.5 HIGHPublished 2026-10-06 · Updated 2026-10-07
AI risk analysis
- Summary
- The Linux kernel's RDS over RDMA implementation contains a deadlock bug where a connection handler tries to destroy a connection while holding a lock that the shutdown work needs to complete, causing workqueues to stall permanently. This occurs when a peer negotiates an older protocol version than expected.
- Exploitability
- Exploitation is difficult without specific preconditions, requiring a particular RDMA-CM connection scenario with protocol version negotiation failure, but could lead to persistent service unavailability.
- Blast radius
- The vulnerability affects systems using RDS over RDMA connections, potentially causing complete workqueue stalls that prevent further connection handling and could lead to service disruption or denial of service.
- Detection
- No reliable host or network indicator is derivable from the published description.
- Prioritized remediation
- Upgrade to Linux kernel version 6.12 or later where this RDS deadlock issue has been fixed.
Analysis generated locally by garnet-coder (no data left the box). AI-assisted — verify against primary sources before acting.
NVD description
In the Linux kernel, the following vulnerability has been resolved: rds: ib: use rds_conn_drop() on protocol version mismatch rds_ib_cm_connect_complete() runs from the RDMA-CM event handler with conn->c_cm_lock held. When the peer negotiates a protocol version older than RDS_PROTOCOL_COMPAT_VERSION, the handler calls rds_conn_destroy(), which is only safe in the rmmod path: it synchronously tears the connection down and flush_work()es the shutdown work cp_down_w. That shutdown work (rds_conn_shutdown()) needs cp_cm_lock, which is the very lock the event handler still holds, so the flush never completes: the two workers wait on each other and the RDS connection workqueues stall for good. All other RDMA-CM failure paths (REJECTED, CONNECT_ERROR, DISCONNECTED) use rds_conn_drop(), which marks the connection RDS_CONN_ERROR and schedules the shutdown work asynchronously. Use it here as well.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
All references
- https://git.kernel.org/stable/c/14fb90067d13f4494cff0f03243fae3cf2911cbc
- https://git.kernel.org/stable/c/344c72a0bc2703a6de4918ed935850e07dae3af2
- https://git.kernel.org/stable/c/424019be3f637da76b74f44a40034669acbb166f
- https://git.kernel.org/stable/c/65ca0a5037152a5a80b8fe6aac80eb80458be573
- https://git.kernel.org/stable/c/7d8c22cb2cb1efb5e830a4545c76abf7b35cc2e8
- https://git.kernel.org/stable/c/b5c9f2951d330d4a198a64d6e60f79b4bd6ef078
- https://git.kernel.org/stable/c/d392b16acd0908f077289aad8bba066ff16de336
- https://git.kernel.org/stable/c/f97d8c7bab7843631206a114986c9059da03efeb
Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.
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