{"id":"CVE-2026-98747","title":"serial: core: fix NULL pointer dereference in serial_core_unregister_port()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: core: fix NULL pointer dereference in serial_core_unregister_port()\n\nport->port_dev is NULL when no port device is installed: it is cleared\non teardown, and nev…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 84a9582fd203063cd4d301204971ff2cd8327f1a < 54abbb862366dcaf1f22f1e968358147b7d0547d","Linux >= 84a9582fd203063cd4d301204971ff2cd8327f1a < 499485a67fbacf4d9afbdb43522388c64f853428","Linux 6.5"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:47:32.607Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98747","references":[{"url":"https://git.kernel.org/stable/c/54abbb862366dcaf1f22f1e968358147b7d0547d"},{"url":"https://git.kernel.org/stable/c/499485a67fbacf4d9afbdb43522388c64f853428"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T16:47:32.501Z","slug":"CVE-2026-98747","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nserial: core: fix NULL pointer dereference in serial_core_unregister_port()\n\nport->port_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->port_dev\nunder port_mutex.\n\nAlso clear port->port_dev on the serial_core_register_port() error\npath, where the port device has already been removed.\n\n## Affected\n\n- `Linux >= 84a9582fd203063cd4d301204971ff2cd8327f1a < 54abbb862366dcaf1f22f1e968358147b7d0547d`\n- `Linux >= 84a9582fd203063cd4d301204971ff2cd8327f1a < 499485a67fbacf4d9afbdb43522388c64f853428`\n- `Linux 6.5`\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":[]}