CVE-2026-97951

A flaw was found in the Linux kernel's iSCSI (Internet Small Computer Systems Interface) target subsystem. A remote client can trigger a Denial of Service (DoS) by sending remaining data packets for a write request that was aborted by a device reset command. Because the subsystem fails to signal completion for the canceled operation, the worker thread hangs indefinitely, resulting in a thread deadlock.

A moderate-impact denial of service flaw exists in the Linux kernel's iSCSI target (LIO) subsystem, affecting the kernel and kernel-rt packages in Red Hat Enterprise Linux 8, 9, and 10, the kernel packages in Red Hat In-Vehicle OS 2, and the RHEL CoreOS nodes shipped with OpenShift Container Platform 4. If a LUN reset aborts a WRITE command that is in the TRANSPORT_WRITE_PENDING state and the initiator then sends the remaining Data-Out PDUs, the target discards the payload but never signals completion for the aborted command. As a result, the abort path blocks indefinitely in target_put_cmd_and_wait(), deadlocking the target worker thread. A remote iSCSI initiator with an established session to an exported LUN can trigger this behavior deterministically, causing a denial of service with no impact on confidentiality or integrity; Red Hat's Moderate rating reflects that triggering requires access to the iSCSI storage network. Red Hat Enterprise Linux 6 and 7 are not affected because the synchronous ABORT/LUN RESET handling that contains this flaw is not present in those streams. The fix is currently deferred for the affected Red Hat products, so the residual risk remains that a system exporting an iSCSI target can be forced into a target-worker deadlock by an initiator until a fixed kernel is deployed.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.