CVE-2026-23306

/* * PoC Concept for CVE-2026-23306 * Triggering the double free requires specific hardware or emulation. * This snippet simulates the logic flow leading to the crash. */ #include <linux/module.h> #include <scsi/scsi_host.h> void simulate_vulnerability_flow(struct pm8001_hba_info *pm8001_ha) { struct sas_task *task = kmalloc(sizeof(*task), GFP_KERNEL); // Simulate PHY down or device gone state int device_state = DEVICE_GONE; // Inside pm8001_queue_command logic (vulnerable path) if (device_state == DEVICE_GONE) { task->task_state_flags = SAS_TASK_STATE_DONE; // The driver frees the task here kfree(task); // Returns error instead of 0, triggering the bug return -ENODEV; } } // Caller (sas_ata_qc_issue) logic void caller_logic(int ret, struct sas_task *task) { if (ret == -ENODEV) { // Caller assumes task wasn't handled and tries to free it again // DOUBLE FREE occurs here kfree(task); } }

{"cve": {"id": "CVE-2026-23306", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-03-25T11:16:26.487", "lastModified": "2026-04-02T15:16:30.703", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: pm8001: Fix use-after-free in pm8001_queue_command()\n\nCommit e29c47fe8946 (\"scsi: pm8001: Simplify pm8001_task_exec()\") refactors\npm8001_queue_command(), however it introduces a potential cause of a double\nfree scenario when it changes the function to return -ENODEV in case of phy\ndown/device gone state.\n\nIn this path, pm8001_queue_command() updates task status and calls\ntask_done to indicate to upper layer that the task has been handled.\nHowever, this also frees the underlying SAS task. A -ENODEV is then\nreturned to the caller. When libsas sas_ata_qc_issue() receives this error\nvalue, it assumes the task wasn't handled/queued by LLDD and proceeds to\nclean up and free the task again, resulting in a double free.\n\nSince pm8001_queue_command() handles the SAS task in this case, it should\nreturn 0 to the caller indicating that the task has been handled."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nscsi: pm8001: Corrección de uso después de liberación en pm8001_queue_command()\n\nEl commit e29c47fe8946 ('scsi: pm8001: Simplificar pm8001_task_exec()') refactoriza pm8001_queue_command(), sin embargo, introduce una causa potencial de un escenario de doble liberación cuando cambia la función para que devuelva -ENODEV en caso de estado de phy inactivo/dispositivo desaparecido.\n\nEn esta ruta, pm8001_queue_command() actualiza el estado de la tarea y llama a task_done para indicar a la capa superior que la tarea ha sido gestionada. Sin embargo, esto también libera la tarea SAS subyacente. Entonces se devuelve un -ENODEV al llamador. Cuando libsas sas_ata_qc_issue() recibe este valor de error, asume que la tarea no fue gestionada/enviada a la cola por LLDD y procede a limpiar y liberar la tarea de nuevo, resultando en una doble liberación.\n\nDado que pm8001_queue_command() gestiona la tarea SAS en este caso, debería devolver 0 al llamador indicando que la tarea ha sido gestionada."}], "metrics": {"cvssMetricV31": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "references": [{"url": "https://git.kernel.org/stable/c/227ff4af00abc40b95123cc27ee8079069dcd8d7", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/38353c26db28efd984f51d426eac2396d299cca7", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/824a7672e3540962d5c77d4c6666254d7aa6f0b3", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8b00427317ba7b7ec91252b034009f638d0f311b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c5dc39f8ae055520fd778b7fb0423f11586f15c4", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ebbb852ffbc952b95ddb7e3872b67b3e74c6da47", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}]}}