CVE-2026-90411
Low risk· EPSS 11%Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
In the Linux kernel, __nvme_fc_init_request() maps cmd_iu and then rsp_iu for DMA. If the rsp_iu mapping fails, the original code leaves the already-mapped cmd_iu unmapped and marks the op as FCPOP_STATE_IDLE, leaking the cmd_iu mapping for every failed op. The fix jumps to an error path that unmaps cmd_iu and leaves the op in FCPOP_STATE_UNINIT.
Risk Assessment
Leaked DMA mappings gradually exhaust kernel resources and can cause system instability or failures in NVMe over Fibre Channel environments. Prolonged operation may require a system restart.
Recommendation
Update the Linux kernel to a version containing the nvme-fc fix. For high-availability systems, schedule the update during a maintenance window.
Other vulnerabilities in Linux kernel (nvme-fc)
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: nvme-fc: unmap cmd_iu DMA on rsp_iu mapping failure in init_request __nvme_fc_init_request() maps cmd_iu and then rsp_iu for DMA. If the rsp_iu mapping fails, the original code only recorded the error and fell through: it left the already-mapped cmd_iu unmapped and still marked the op as FCPOP_STATE_IDLE before returning. Since blk-mq does not call .exit_request() when .init_request() fails, the cmd_iu mapping is leaked for every op whose rsp_iu mapping fails. Jump to an error path on rsp_iu mapping failure that unmaps cmd_iu and returns the error without marking the op idle, so it stays in the FCPOP_STATE_UNINIT state set by the initial memset().
Vulnerability data from NVD (NIST) · CISA KEV · EPSS