{"id":"CVE-2026-90057","summary":"slip: remove slip_hangup() to fix use-after-free in slip_receive_buf()","details":"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-\u003eops-\u003ehangup() while holding only\na read lock on tty-\u003eldisc_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-\u003eldisc_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().","modified":"2026-09-19T03:47:24.181181063Z","published":"2026-09-17T16:05:41.670Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90057.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/23c53269f2baaedf2d92784290cb9ef6db2a3bce"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9a3b1edff1ecb47d323f2506b3ffc22178acd1c6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a2dbac3fb03b4427ccf057debc83fc61ee102529"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a540a49fcca59d1c92c3a6462e67ca21676a88df"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ddbc5dc5a2e29b3934da09c1ba3c930fd8a40fd6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/de1f978c0f6ab42b28192d74dc59af52fdc76135"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90057.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90057"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5342b77c4123ba39f911d92a813295fb3bb21f69"},{"fixed":"9a3b1edff1ecb47d323f2506b3ffc22178acd1c6"},{"fixed":"a2dbac3fb03b4427ccf057debc83fc61ee102529"},{"fixed":"de1f978c0f6ab42b28192d74dc59af52fdc76135"},{"fixed":"ddbc5dc5a2e29b3934da09c1ba3c930fd8a40fd6"},{"fixed":"a540a49fcca59d1c92c3a6462e67ca21676a88df"},{"fixed":"23c53269f2baaedf2d92784290cb9ef6db2a3bce"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90057.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.32"},{"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"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90057.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}