CVE-2026-98754: tty: vcc: hold port lock when clearing tty pointer in vcc_cleanup

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: 2026-10-18 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: tty: vcc: hold port lock when clearing tty pointer in vcc_cleanup vcc_cleanup() sets port->tty to NULL without holding port->lock, racing with vcc_event() LDC callbacks that read port->tty under port->lock and then use tty->port. This can cause a use-after-free when the callback dereferences tty->port after cleanup has already destroyed and freed it.

Affected products

Linux: 4.14 — 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/03b49c991abb8d021ca6fe51cd173447236b0552
https://git.kernel.org/stable/c/1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4
https://git.kernel.org/stable/c/57753441ef84bee3bf0e9ee1e3778d119c44aa32
https://git.kernel.org/stable/c/821050631750e982007c0856c119346edba51cae
https://git.kernel.org/stable/c/88f6ecb058801e9ce7b9aabc966530118d7cd53c
https://git.kernel.org/stable/c/afcbb821c571f39b273127a7c7d26cb2cef27d2f
https://git.kernel.org/stable/c/b0ad9d025c3229a628a82fbaa7578891075a950d
https://git.kernel.org/stable/c/b193617080b7036d143674089bcfb7d2ba3db588

Get alerted when CVE-2026-98754 or the next vulnerability affects your stack