MEDIUM

CVE-2020-29660

Q: What is CVE-2020-29660?

A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel through 5.9.13. drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may allow a read-after-free attack against TIOCGSID, aka CID-c8bcd9c5be24.

Q: Is CVE-2020-29660 actively exploited?

Active exploitation of CVE-2020-29660 has not been confirmed. Its EPSS score was 0.5% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-29660?

CVE-2020-29660 has a CVSS v3 base score of 4.4 (MEDIUM severity).

CVSS v3

4.4

MEDIUM

EPSS Score

0.5 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

kernel-tools-libs-develAlmaLinux:8all versions · fixed in 4.18.0-348.el8

Vendor advisories

CVE-2020-29660 Red Hat Product Security150 products fixed · 29 known affected
kernel: locking inconsistency in drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c can lead to a read-after-free
bpftool as a component of Red Hat Enterprise Linux 7 · kernel as a component of Red Hat Enterprise Linux 7 · kernel-abi-whitelists as a component of Red Hat Enterprise Linux 7
ICSA-24-074-07 CISA1 known affected
Siemens SIMATIC
Siemens SIMATIC RF160B (6GT2003-0FA00): <V2.2
SSA-770721 Siemens ProductCERT1 known affected
SSA-770721: Multiple Vulnerabilities in SIMATIC RF160B before V2.2
SIMATIC RF160B (6GT2003-0FA00)
RHSA-2021:4356 Red Hat Product Security120 products fixed
Red Hat Security Advisory: kernel security, bug fix, and enhancement update
RHSA-2021:4140 Red Hat Product Security30 products fixed
Red Hat Security Advisory: kernel-rt security and bug fix update

Full record on NVD

Description

A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel through 5.9.13. drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may allow a read-after-free attack against TIOCGSID, aka CID-c8bcd9c5be24.

Technical details

Published: 2020-12-09

Frequently asked questions

What is CVE-2020-29660?

Is CVE-2020-29660 actively exploited?

Active exploitation of CVE-2020-29660 has not been confirmed. Its EPSS score was 0.5% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-29660?

CVE-2020-29660 has a CVSS v3 base score of 4.4 (MEDIUM severity).

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