CVE-2026-98257

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf147dd9ecabf23fd63d2562ffe64252a0453ecde < 424019be3f637da76b74f44a40034669acbb166faffected
LinuxLinuxf147dd9ecabf23fd63d2562ffe64252a0453ecde < 14fb90067d13f4494cff0f03243fae3cf2911cbcaffected
LinuxLinuxf147dd9ecabf23fd63d2562ffe64252a0453ecde < 344c72a0bc2703a6de4918ed935850e07dae3af2affected
LinuxLinuxf147dd9ecabf23fd63d2562ffe64252a0453ecde < b5c9f2951d330d4a198a64d6e60f79b4bd6ef078affected
LinuxLinuxf147dd9ecabf23fd63d2562ffe64252a0453ecde < d392b16acd0908f077289aad8bba066ff16de336affected
LinuxLinuxf147dd9ecabf23fd63d2562ffe64252a0453ecde < 65ca0a5037152a5a80b8fe6aac80eb80458be573affected
LinuxLinuxf147dd9ecabf23fd63d2562ffe64252a0453ecde < 7d8c22cb2cb1efb5e830a4545c76abf7b35cc2e8affected
LinuxLinuxf147dd9ecabf23fd63d2562ffe64252a0453ecde < f97d8c7bab7843631206a114986c9059da03efebaffected
LinuxLinux2.6.37affected
LinuxLinux0 < 2.6.37unaffected
LinuxLinux5.10.271 <= 5.10.*unaffected
LinuxLinux5.15.222 <= 5.15.*unaffected
LinuxLinux6.1.189 <= 6.1.*unaffected
LinuxLinux6.6.158 <= 6.6.*unaffected
LinuxLinux6.12.112 <= 6.12.*unaffected
LinuxLinux6.18.54 <= 6.18.*unaffected
LinuxLinux7.2.8 <= 7.2.*unaffected
LinuxLinux7.3-rc4 <= *unaffected

Weaknesses

References