{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "05e5027efc9c0bb6d1d04cde279afbafca0a7929"
            },
            {
              "fixed": "ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a"
            },
            {
              "fixed": "c92ef8fd834521f0b788e0511976c689fe57c63c"
            },
            {
              "fixed": "a4613140f01bd0fb9980e2746ed9aaa65a29b5d6"
            },
            {
              "fixed": "1a3258e105f711538201bdd2ac2a05b11554eabc"
            },
            {
              "fixed": "4a6518be316029650301f2a5e8f0def229b895d9"
            },
            {
              "fixed": "b6b5d64cb161a28347d64dc3168a636c4abb68d5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.8.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93050.json"
  },
  "details": "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-\u003edev)\n   dereferences ipoctal-\u003edev after the ipack_device has been freed\n   by ipack_device_del().  Fix by caching ipoctal-\u003ecarrier_owner\n   during probe() and calling module_put() on the cached pointer\n   directly in cleanup(), avoiding any access to ipoctal-\u003edev.\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.",
  "id": "CVE-2026-93050",
  "modified": "2026-09-19T03:30:23.960817378Z",
  "published": "2026-09-17T16:10:40.360Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a3258e105f711538201bdd2ac2a05b11554eabc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a6518be316029650301f2a5e8f0def229b895d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4613140f01bd0fb9980e2746ed9aaa65a29b5d6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6b5d64cb161a28347d64dc3168a636c4abb68d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c92ef8fd834521f0b788e0511976c689fe57c63c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93050.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93050"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "ipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove"
}