{"id":"CVE-2026-93050","title":"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.…","summary":"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.…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 05e5027efc9c0bb6d1d04cde279afbafca0a7929 < ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a","Linux >= 05e5027efc9c0bb6d1d04cde279afbafca0a7929 < c92ef8fd834521f0b788e0511976c689fe57c63c","Linux >= 05e5027efc9c0bb6d1d04cde279afbafca0a7929 < a4613140f01bd0fb9980e2746ed9aaa65a29b5d6","Linux >= 05e5027efc9c0bb6d1d04cde279afbafca0a7929 < 1a3258e105f711538201bdd2ac2a05b11554eabc","Linux >= 05e5027efc9c0bb6d1d04cde279afbafca0a7929 < 4a6518be316029650301f2a5e8f0def229b895d9","Linux >= 05e5027efc9c0bb6d1d04cde279afbafca0a7929 < b6b5d64cb161a28347d64dc3168a636c4abb68d5","Linux 3.8"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:58.367","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93050","references":[{"url":"https://git.kernel.org/stable/c/1a3258e105f711538201bdd2ac2a05b11554eabc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4a6518be316029650301f2a5e8f0def229b895d9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a4613140f01bd0fb9980e2746ed9aaa65a29b5d6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b6b5d64cb161a28347d64dc3168a636c4abb68d5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c92ef8fd834521f0b788e0511976c689fe57c63c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.771Z","epss":0.00205,"epssPercentile":0.109,"slug":"CVE-2026-93050","body":"## Overview\n\nIn 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.\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":[]}