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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90057
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:16:54 UTC
Updated2026-09-18 18:17:40 UTC
DescriptionIn 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().

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001600000 probability, percentile 0.055590000 (date 2026-09-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5342b77c4123ba39f911d92a813295fb3bb21f69 9a3b1edff1ecb47d323f2506b3ffc22178acd1c6 git Not specified
CNA Linux Linux affected 5342b77c4123ba39f911d92a813295fb3bb21f69 a2dbac3fb03b4427ccf057debc83fc61ee102529 git Not specified
CNA Linux Linux affected 5342b77c4123ba39f911d92a813295fb3bb21f69 de1f978c0f6ab42b28192d74dc59af52fdc76135 git Not specified
CNA Linux Linux affected 5342b77c4123ba39f911d92a813295fb3bb21f69 ddbc5dc5a2e29b3934da09c1ba3c930fd8a40fd6 git Not specified
CNA Linux Linux affected 5342b77c4123ba39f911d92a813295fb3bb21f69 a540a49fcca59d1c92c3a6462e67ca21676a88df git Not specified
CNA Linux Linux affected 5342b77c4123ba39f911d92a813295fb3bb21f69 23c53269f2baaedf2d92784290cb9ef6db2a3bce git Not specified
CNA Linux Linux affected 2.6.32 Not specified
CNA Linux Linux unaffected 2.6.32 semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/23c53269f2baaedf2d92784290cb9ef6db2a3bce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a2dbac3fb03b4427ccf057debc83fc61ee102529 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a540a49fcca59d1c92c3a6462e67ca21676a88df 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/de1f978c0f6ab42b28192d74dc59af52fdc76135 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ddbc5dc5a2e29b3934da09c1ba3c930fd8a40fd6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9a3b1edff1ecb47d323f2506b3ffc22178acd1c6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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