{"id":"CVE-2026-98747","summary":"serial: core: fix NULL pointer dereference in serial_core_unregister_port()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: core: fix NULL pointer dereference in serial_core_unregister_port()\n\nport-\u003eport_dev is NULL when no port device is installed: it is cleared\non teardown, and never set if registration failed before\nserial_core_port_device_add().  serial_core_unregister_port() passes it\nstraight to serial_core_get_ctrl_dev(), which dereferences it:\n\n  KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]\n  RIP: serial_core_unregister_port\n  Call Trace:\n   serial8250_unregister_port\n   serial8250_remove\n   unbind_store\n\nReturn early when there is no port device, and read port-\u003eport_dev\nunder port_mutex.\n\nAlso clear port-\u003eport_dev on the serial_core_register_port() error\npath, where the port device has already been removed.","modified":"2026-10-20T02:30:57.834655542Z","published":"2026-10-18T15:47:32.607Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98747.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/499485a67fbacf4d9afbdb43522388c64f853428"},{"type":"WEB","url":"https://git.kernel.org/stable/c/54abbb862366dcaf1f22f1e968358147b7d0547d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98747.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98747"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"84a9582fd203063cd4d301204971ff2cd8327f1a"},{"fixed":"54abbb862366dcaf1f22f1e968358147b7d0547d"},{"fixed":"499485a67fbacf4d9afbdb43522388c64f853428"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98747.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.5.0"},{"fixed":"7.2.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98747.json"}}],"schema_version":"1.9.0"}