{"id":"CVE-2026-93050","revision":"640c06f6f7bf4465a0fd374bf07e3727","records":[{"revision":"640c06f6f7bf4465a0fd374bf07e3727","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93050","aliases":[],"title":"ipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove\n\nThree issues arise when the device is removed while a tty session is\nstill active:\n\n1. UAF of struct ipoctal: the remove callback frees ipoctal via\n   kfree() while tty ops may still access it.  Fix by introducing\n   kref-based lifetime management — kref is taken in install() when\n   a tty is opened and released in cleanup() when the tty is finally\n   destroyed; remove() uses kref_put() instead of kfree().\n\n2. NULL dereference in ipoctal_write_tty(): __ipoctal_remove()\n   frees xmit_buf via tty_port_free_xmit_buf() while a userspace\n   process may still hold the tty fd and call write().  Fix by\n   checking for NULL xmit_buf in ipoctal_write_tty().\n\n3. UAF in ipoctal_cleanup(): ipack_put_carrier(ipoctal->dev)\n   dereferences ipoctal->dev after the ipack_device has been freed\n   by ipack_device_del().  Fix by caching ipoctal->carrier_owner\n   during probe() and calling module_put() on the cached pointer\n   directly in cleanup(), avoiding any access to ipoctal->dev.\n\nAlso introduce a \"removed\" flag in struct ipoctal, set at the start\nof __ipoctal_remove(), and checked in every tty op that accesses\nhardware resources (port_activate, write_tty, set_termios, hangup,\nshutdown).  This prevents page faults when devm_ioremap() regions\nare unmapped after remove() returns.","state":0,"publishedAt":"2026-09-17T16:10:40.36+00:00","modifiedAt":"2026-10-19T09:04:45.286+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/ipack/devices/ipoctal.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"05e5027efc9c0bb6d1d04cde279afbafca0a7929\",\n                            \"lessThan\": \"ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"05e5027efc9c0bb6d1d04cde279afbafca0a7929\",\n                            \"lessThan\": \"c92ef8fd834521f0b788e0511976c689fe57c63c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"05e5027efc9c0bb6d1d04cde279afbafca0a7929\",\n                            \"lessThan\": \"a4613140f01bd0fb9980e2746ed9aaa65a29b5d6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"05e5027efc9c0bb6d1d04cde279afbafca0a7929\",\n                            \"lessThan\": \"1a3258e105f711538201bdd2ac2a05b11554eabc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"05e5027efc9c0bb6d1d04cde279afbafca0a7929\",\n                            \"lessThan\": \"4a6518be316029650301f2a5e8f0def229b895d9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"05e5027efc9c0bb6d1d04cde279afbafca0a7929\",\n                            \"lessThan\": \"b6b5d64cb161a28347d64dc3168a636c4abb68d5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/ipack/devices/ipoctal.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.8\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a","https://git.kernel.org/stable/c/c92ef8fd834521f0b788e0511976c689fe57c63c","https://git.kernel.org/stable/c/a4613140f01bd0fb9980e2746ed9aaa65a29b5d6","https://git.kernel.org/stable/c/1a3258e105f711538201bdd2ac2a05b11554eabc","https://git.kernel.org/stable/c/4a6518be316029650301f2a5e8f0def229b895d9","https://git.kernel.org/stable/c/b6b5d64cb161a28347d64dc3168a636c4abb68d5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93050","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93050","identifiers":["CVE-2026-93050"]},"retained":false,"historicalAffected":[]}],"coverage":[]}