VulnerabilityPublished 17 Sep 2026Updated 21 Oct 2026

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

Affects Linux kernelSource CVE Database V5

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

Data as of 26 Oct 2026, 13:07 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in ea3d2fae7c1d6492145976553817d22e8ef69a0e, c3b5623fd97648f2747444aa8932ae604662df93, 21031bd0d662549412378110c989b164feb6e4be +2

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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.

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, < 3dbf85ef40b6366ba15e882f7536cdc98bea579a	Fixed in 3dbf85ef40b6366ba15e882f7536cdc98bea579a
LinuxLinux	Affected ≥ a3a10ce3429e5dee623ad5c8407ea58e204fcb0a, < 2af4c46b429907edc8cb069c78fca1d950120b98	Fixed in 2af4c46b429907edc8cb069c78fca1d950120b98
LinuxLinux	Affected =4.3	Fixed in–

Description

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.

References

Community reviews

Loading reviews…