CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's handling of connections in the SMC (Shared Memory Communications) subsystem, where improper management of connection states can lead to use-after-free conditions. This flaw allows a malicious actor to exploit the re-armed receive tasklet, potentially leading to memory corruption and arbitrary code execution. System administrators and developers maintaining Linux-based systems, particularly those utilizing SMC, should prioritize applying the relevant patches to mitigate this risk.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: net/smc: unregister the connection before draining the rx tasklet smc_conn_free() calls smc_ism_unset_conn() only while the link group is still on its device list, and never sets conn->killed. smc_lgr_terminate_sched() unlinks the group immediately and defers killing its connections to a work item, so a connection freed in that window keeps its smcd->conn[] slot with both gates in smcd_handle_irq() open, and the device can re-arm the receive tasklet after tasklet_kill() has returned. On the DMB-nocopy path the ghost send buffer is freed right after that drain, so the re-armed tasklet dereferences it. Unregister unconditionally and drain before the detach at both teardown sites, mirroring rmb_desc, which smc_buf_unuse() releases after the drain. Clear conn->sndbuf_desc before freeing it as well, so a reader that samples the pointer cannot get one that is already freed.