Bug 2536178 (CVE-2026-90335) - CVE-2026-90335 kernel: tty: skip cdev_del() when no cdev is registered
Summary: CVE-2026-90335 kernel: tty: skip cdev_del() when no cdev is registered
Keywords:
Status: NEW
Alias: CVE-2026-90335
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-17 16:41 UTC by OSIDB Bzimport
Modified: 2026-10-13 14:26 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
Environment:
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Description OSIDB Bzimport 2026-09-17 16:41:35 UTC 
In the Linux kernel, the following vulnerability has been resolved:

tty: skip cdev_del() when no cdev is registered

TTY device registration can fail before a cdev is allocated.
Serial core keeps the port so setserial can still use it, and later
removal passes the NULL cdev slot to cdev_del(), causing a NULL-pointer
dereference.

Only delete the cdev when the slot is not NULL.
Comment 1 gkamathe 2026-09-21 20:01:05 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90335.mbox
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