VulnerabilityPublished 17 Sep 2026Updated 30 Oct 2026

CVE-2026-90335: Linux kernel · tty: skip cdev_del() when no cdev is registered

Source GCVE Database

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Authoritative record:CVE-2026-90335· Medium

Not known to be exploited · fixed in ea3d2fae7c1d6492145976553817d22e8ef69a0e : update Linux kernel when convenient.

Data as of 30 Oct 2026, 18:32 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in ea3d2fae7c1d6492145976553817d22e8ef69a0e, c3b5623fd97648f2747444aa8932ae604662df93, 21031bd0d662549412378110c989b164feb6e4be +3

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-5wc4-c9q8-2q27

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ a3a10ce3429e5dee623ad5c8407ea58e204fcb0a, < ea3d2fae7c1d6492145976553817d22e8ef69a0e	Fixed in ea3d2fae7c1d6492145976553817d22e8ef69a0e
LinuxLinux	Affected ≥ a3a10ce3429e5dee623ad5c8407ea58e204fcb0a, < c3b5623fd97648f2747444aa8932ae604662df93	Fixed in c3b5623fd97648f2747444aa8932ae604662df93
LinuxLinux	Affected ≥ a3a10ce3429e5dee623ad5c8407ea58e204fcb0a, < 21031bd0d662549412378110c989b164feb6e4be	Fixed in 21031bd0d662549412378110c989b164feb6e4be
LinuxLinux	Affected ≥ a3a10ce3429e5dee623ad5c8407ea58e204fcb0a, < 6c92b8d9c23a92f85b20bee3578d0f19cd1b1a68	Fixed in 6c92b8d9c23a92f85b20bee3578d0f19cd1b1a68
LinuxLinux	Affected ≥ a3a10ce3429e5dee623ad5c8407ea58e204fcb0a, < 3dbf85ef40b6366ba15e882f7536cdc98bea579a	Fixed in 3dbf85ef40b6366ba15e882f7536cdc98bea579a
LinuxLinux	Affected ≥ a3a10ce3429e5dee623ad5c8407ea58e204fcb0a, < 2af4c46b429907edc8cb069c78fca1d950120b98	Fixed in 2af4c46b429907edc8cb069c78fca1d950120b98

AI-suggested

A fix has been implemented that skips the cdev_del() call when no cdev is registered, preventing the NULL-pointer dereference. Users should apply the official kernel update containing this fix once available. Patch status is not explicitly confirmed in the input; check the vendor advisory for current remediation guidance.

Description

A vulnerability in the Linux kernel's TTY subsystem involves a NULL-pointer dereference caused by calling cdev_del() on a NULL cdev pointer when device registration fails. This occurs because the serial core retains the port for setserial usage even if cdev allocation fails, leading to improper cleanup.

References

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