{"id":"CVE-2026-97480","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: 8250: protect against NULL uart->port.dev in register\n\nserial8250_register_8250_port() conditionally copies uart->port.dev\nfrom up->port.dev only when up->…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: 8250: protect against NULL uart->port.dev in register\n\nserial8250_register_8250_port() conditionally copies uart->port.dev\nfrom up->port.dev only when up->…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5cbab666721d974bfe033a12045d808936deaefd","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 941c9f84c9b6310f7aaa1c8c785dcc634ee33050","Linux < 6.18.53","Linux (all versions)"],"published":"2026-09-24","updated":"2026-09-24","sourceUpdated":"2026-09-24T17:17:25.467","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97480","references":[{"url":"https://git.kernel.org/stable/c/5cbab666721d974bfe033a12045d808936deaefd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/941c9f84c9b6310f7aaa1c8c785dcc634ee33050","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-24T16:47:15.871Z","slug":"CVE-2026-97480","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: 8250: protect against NULL uart->port.dev in register\n\nserial8250_register_8250_port() conditionally copies uart->port.dev\nfrom up->port.dev only when up->port.dev is non-NULL:\n\n\tif (up->port.dev) {\n\t\tuart->port.dev = up->port.dev;\n\t\t...\n\t}\n\nSo if both the existing uart slot and up have a NULL ->dev,\nuart->port.dev remains NULL. The very next ACPI companion check\nthen dereferences it unconditionally:\n\n\tif (!has_acpi_companion(uart->port.dev)) {\n\nhas_acpi_companion() reads dev->fwnode without a NULL guard\n(include/linux/acpi.h), so this NULL-derefs the kernel for the\nremaining no-dev case rather than just skipping the\nmctrl_gpio_init() initialisation as intended.\n\nsmatch flags the inconsistency:\n\n  drivers/tty/serial/8250/8250_core.c:767\n  serial8250_register_8250_port() error: 'uart->port.dev' could be\n  null (see line 719)\n\nGuard the call with a NULL check so register continues to work\nfor callers that legitimately have no parent device (legacy\nnon-OF/non-ACPI registrations).\n\nNo functional change for callers that pass a non-NULL ->dev.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}