CVE-2026-90057

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

slip: remove slip_hangup() to fix use-after-free in slip_receive_buf()

Jaeyoung Chung and Eulgyu Kim reported a slab-use-after-free read

in slip_receive_buf() when racing against tty hangup.

tty_ldisc_hangup() calls ld->ops->hangup() while holding only

a read lock on tty->ldisc_sem (via tty_ldisc_ref()).

Because slip_hangup() simply called slip_close(), it ran concurrently

with reader functions such as slip_receive_buf().

slip_close() unregisters and frees the net device and its private

struct slip, causing concurrent reader threads in slip_receive_buf()

to dereference freed memory.

Line discipline close() is already guaranteed to be called under

the write lock of tty->ldisc_sem during hangup processing

(in tty_ldisc_reinit() or tty_ldisc_kill()).

Remove slip_hangup() so teardown is serialized cleanly by slip_close().

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References