{"id":"CVE-2026-90057","published":"2026-09-17T17:16:54.310","lastModified":"2026-09-18T18:17:40.053","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nslip: remove slip_hangup() to fix use-after-free in slip_receive_buf()\n\nJaeyoung Chung and Eulgyu Kim reported a slab-use-after-free read\nin slip_receive_buf() when racing against tty hangup.\n\ntty_ldisc_hangup() calls ld->ops->hangup() while holding only\na read lock on tty->ldisc_sem (via tty_ldisc_ref()).\nBecause slip_hangup() simply called slip_close(), it ran concurrently\nwith reader functions such as slip_receive_buf().\n\nslip_close() unregisters and frees the net device and its private\nstruct slip, causing concurrent reader threads in slip_receive_buf()\nto dereference freed memory.\n\nLine discipline close() is already guaranteed to be called under\nthe write lock of tty->ldisc_sem during hangup processing\n(in tty_ldisc_reinit() or tty_ldisc_kill()).\n\nRemove slip_hangup() so teardown is serialized cleanly by slip_close().","cvssScore":7.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/23c53269f2baaedf2d92784290cb9ef6db2a3bce","tags":[]},{"url":"https://git.kernel.org/stable/c/9a3b1edff1ecb47d323f2506b3ffc22178acd1c6","tags":[]},{"url":"https://git.kernel.org/stable/c/a2dbac3fb03b4427ccf057debc83fc61ee102529","tags":[]},{"url":"https://git.kernel.org/stable/c/a540a49fcca59d1c92c3a6462e67ca21676a88df","tags":[]},{"url":"https://git.kernel.org/stable/c/ddbc5dc5a2e29b3934da09c1ba3c930fd8a40fd6","tags":[]},{"url":"https://git.kernel.org/stable/c/de1f978c0f6ab42b28192d74dc59af52fdc76135","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}