CVE-2026-93050
UnknownSummary
In the Linux kernel, the ipack ipoctal driver had three issues when a device was removed while a tty session was active: a use-after-free of struct ipoctal, a NULL dereference in ipoctal_write_tty(), and a use-after-free in ipoctal_cleanup(). Fixes introduce kref-based lifetime management, a NULL check for xmit_buf, and a "removed" flag checked in tty operations.
Risk Assessment
Use-after-free and NULL dereference bugs can cause kernel panics or potentially allow code execution in kernel context, posing a serious threat to system stability and security.
Recommendation
Update the Linux kernel to a version containing the fixes for the ipack ipoctal driver; avoid detaching ipoctal devices during active tty sessions until patched.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove Three issues arise when the device is removed while a tty session is still active: 1. UAF of struct ipoctal: the remove callback frees ipoctal via kfree() while tty ops may still access it. Fix by introducing kref-based lifetime management — kref is taken in install() when a tty is opened and released in cleanup() when the tty is finally destroyed; remove() uses kref_put() instead of kfree(). 2. NULL dereference in ipoctal_write_tty(): __ipoctal_remove() frees xmit_buf via tty_port_free_xmit_buf() while a userspace process may still hold the tty fd and call write(). Fix by checking for NULL xmit_buf in ipoctal_write_tty(). 3. UAF in ipoctal_cleanup(): ipack_put_carrier(ipoctal->dev) dereferences ipoctal->dev after the ipack_device has been freed by ipack_device_del(). Fix by caching ipoctal->carrier_owner during probe() and calling module_put() on the cached pointer directly in cleanup(), avoiding any access to ipoctal->dev. Also introduce a "removed" flag in struct ipoctal, set at the start of __ipoctal_remove(), and checked in every tty op that accesses hardware resources (port_activate, write_tty, set_termios, hangup, shutdown). This prevents page faults when devm_ioremap() regions are unmapped after remove() returns.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS