CVE-2021-47358: staging: greybus: uart: fix tty use after free

Severity: high (CVSS 7.8 v3.1)
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: 2024-05-21 · updated 2026-08-04
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: staging: greybus: uart: fix tty use after free User space can hold a tty open indefinitely and tty drivers must not release the underlying structures until the last user is gone. Switch to using the tty-port reference counter to manage the life time of the greybus tty state to avoid use after free after a disconnect.

Affected products

Linux kernel: from 4.9 before 4.9.285; from 4.10 before 4.14.249; from 4.15 before 4.19.209; from 4.20 before 5.4.150; from 5.5 before 5.10.70; from 5.11 before 5.14.9 — fixed in 4.14.249, 4.19.209, 4.9.285, 5.10.70, 5.14.9, 5.4.150

How to fix

Upgrade to a fixed version: Linux kernel 4.14.249, 4.19.209, 4.9.285, 5.10.70. Check the vendor advisory for mitigations.

References

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