CVE-2020-29661

HIGH

Linux kernel <5.9.13 - Use After Free

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2020-29661. PoCs published by wojkos9.

AI-analyzed exploit summary This repository contains a functional exploit for CVE-2020-29661, targeting a Linux kernel vulnerability related to PID reference counting. The exploit includes a kernel module and user-space code to trigger the bug, manipulate PID references, and achieve privilege escalation.

Description

A locking issue was discovered in the tty subsystem of the Linux kernel through 5.9.13. drivers/tty/tty_jobctrl.c allows a use-after-free attack against TIOCSPGRP, aka CID-54ffccbf053b.

Exploits (1)

nomisec WORKING POC 1 stars
by wojkos9 · poc
https://github.com/wojkos9/arm-CVE-2020-29661

This repository contains a functional exploit for CVE-2020-29661, targeting a Linux kernel vulnerability related to PID reference counting. The exploit includes a kernel module and user-space code to trigger the bug, manipulate PID references, and achieve privilege escalation.

Classification
Working Poc 95%
Attack Type
Lpe
Complexity
Complex
Reliability
Racy
Target: Linux kernel 4.1.10 (and likely other versions)
No auth needed
Prerequisites: Access to a vulnerable Linux kernel · Ability to compile and load kernel modules
mistral-large-3 · analyzed Feb 19, 2026 Full analysis →

References (11)

Core 11
Core References
Mailing List, Patch, Third Party Advisory mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2020/12/10/1
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2021/dsa-4843
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
Patch, Third Party Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpuoct2021.html
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20210122-0001/

Scores

CVSS v3 7.8
EPSS 0.0113
EPSS Percentile 62.4%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-416 CWE-667
Status published
Products (14)
broadcom/fabric_operating_system
debian/debian_linux 9.0
debian/debian_linux 10.0
fedoraproject/fedora 32
fedoraproject/fedora 33
linux/linux_kernel 2.6.26 - 4.4.248
netapp/8300_firmware
netapp/8700_firmware
netapp/a400_firmware
netapp/a700s_firmware
... and 4 more
Published Dec 09, 2020
Tracked Since Feb 18, 2026