CVE-2026-90057slip: remove slip_hangup() to fix use-after-free in slip_receive_buf()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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().
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 5342b77c4123ba39f911d92a813295fb3bb21f69 builds before 9a3b1edff1ecb47d323f2506b3ffc22178acd1c6; from 5342b77c4123ba39f911d92a813295fb3bb21f69 before a2dbac3fb03b4427ccf057debc83fc61ee102529; from 5342b77c4123ba39f911d92a813295fb3bb21f69 before de1f978c0f6ab42b28192d74dc59af52fdc76135; from 5342b77c4123ba39f911d92a813295fb3bb21f69 before ddbc5dc5a2e29b3934da09c1ba3c930fd8a40fd6; from 5342b77c4123ba39f911d92a813295fb3bb21f69 before a540a49fcca59d1c92c3a6462e67ca21676a88df; 5342b77c4123ba39f911d92a813295fb3bb21f69 builds before 23c53269f2baaedf2d92784290cb9ef6db2a3bce | CNA record |
References
- https://git.kernel.org/stable/c/9a3b1edff1ecb47d323f2506b3ffc22178acd1c6
- https://git.kernel.org/stable/c/a2dbac3fb03b4427ccf057debc83fc61ee102529
- https://git.kernel.org/stable/c/de1f978c0f6ab42b28192d74dc59af52fdc76135
- https://git.kernel.org/stable/c/ddbc5dc5a2e29b3934da09c1ba3c930fd8a40fd6
- https://git.kernel.org/stable/c/a540a49fcca59d1c92c3a6462e67ca21676a88df
- https://git.kernel.org/stable/c/23c53269f2baaedf2d92784290cb9ef6db2a3bce
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.