What’s Vulnerable › Vulnerabilities

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

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-30

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.

Affected products

• Linux: 4.3 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/21031bd0d662549412378110c989b164feb6e4be
• https://git.kernel.org/stable/c/2af4c46b429907edc8cb069c78fca1d950120b98
• https://git.kernel.org/stable/c/3dbf85ef40b6366ba15e882f7536cdc98bea579a
• https://git.kernel.org/stable/c/6c92b8d9c23a92f85b20bee3578d0f19cd1b1a68
• https://git.kernel.org/stable/c/c3b5623fd97648f2747444aa8932ae604662df93
• https://git.kernel.org/stable/c/ea3d2fae7c1d6492145976553817d22e8ef69a0e

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