CVE-2021-47403: ipack: ipoctal: fix module reference leak

Severity: high (CVSS 7.1 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 2026-06-17
Weakness: CWE-200

Description

In the Linux kernel, the following vulnerability has been resolved: ipack: ipoctal: fix module reference leak A reference to the carrier module was taken on every open but was only released once when the final reference to the tty struct was dropped. Fix this by taking the module reference and initialising the tty driver data when installing the tty.

Affected products

Linux kernel: from 3.18 before 4.4.286; from 4.5 before 4.9.285; from 4.10 before 4.14.249; from 4.15 before 4.19.209; from 4.20 before 5.4.151; from 5.5 before 5.10.71 — fixed in 4.14.249, 4.19.209, 4.4.286, 4.9.285, 5.10.71, 5.14.10

How to fix

Upgrade to a fixed version: Linux kernel 4.14.249, 4.19.209, 4.4.286, 4.9.285. Check the vendor advisory for mitigations.

References

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