CVE-2020-29661

HIGHNVD 7.87.8—

7.8

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.

CVSS v3: 7.8
EG Score: 7.8(medium)
EPSS: 69.5%
KEV: Not listed

Published

December 9, 2020

Last Modified

November 21, 2024

References (22)

cve@mitrehttp://packetstormsecurity.com/files/160681/Linux-TIOCSPGRP-Broken-Locking.html
cve@mitrehttp://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html
cve@mitrehttp://www.openwall.com/lists/oss-security/2020/12/10/1
cve@mitrehttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54ffccbf053b5b6ca4f6e45094b942fab92a25fc
cve@mitrehttps://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
cve@mitrehttps://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BOB25SU6XUL4TNP7KB63WNZSYTIYFDPP/
cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MZ7OAKAEFAXQRGBZK4LYUWINCD3D2XCL/
cve@mitrehttps://security.netapp.com/advisory/ntap-20210122-0001/
cve@mitrehttps://www.debian.org/security/2021/dsa-4843
cve@mitrehttps://www.oracle.com/security-alerts/cpuoct2021.html
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/160681/Linux-TIOCSPGRP-Broken-Locking.html
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2020/12/10/1
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54ffccbf053b5b6ca4f6e45094b942fab92a25fc

Patch Availability(20)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-image-virtual-lts-xenial (4.4.0.203.209) @ xenial	2026-05-23	ubuntu
ubuntu	linux-image-virtual-hwe-16.04-edge (4.15.0.136.132) @ xenial	2026-05-23	ubuntu
ubuntu	linux-image-virtual-hwe-18.04-edge (5.4.0.66.69) @ focal	2026-05-23	ubuntu
ubuntu	linux-image-oem-20.04 (5.6.0.1048.44) @ focal	2026-05-23	ubuntu
ubuntu	linux-virtual (3.13.0.188.197) @ trusty	2026-05-23	ubuntu
ubuntu	linux-image-virtual-hwe-20.04-edge (5.8.0.44.49) @ groovy	2026-05-23	ubuntu
ubuntu	lowlatency-4.4 (4.4.0-168) @ xenial	2026-05-23	ubuntu
redhat	kernel-0:3.10.0-693.87.1.el7	2021-06-01	redhat
redhat	kernel-0:2.6.32-754.39.1.el6	2021-04-20	redhat
redhat	kpatch-patch	2021-03-30	redhat
redhat	kernel-0:3.10.0-1062.46.1.el7	2021-03-30	redhat
redhat	kernel-rt-0:3.10.0-1160.21.1.rt56.1158.el7	2021-03-16	redhat
redhat	kernel-0:3.10.0-1160.21.1.el7	2021-03-16	redhat
redhat	kernel-0:3.10.0-957.70.1.el7	2021-03-16	redhat
redhat	kernel-0:4.18.0-193.46.1.el8_2	2021-03-09	redhat
redhat	kernel-rt-0:4.18.0-193.46.1.rt13.96.el8_2	2021-03-09	redhat
redhat	kernel-0:4.18.0-147.43.1.el8_1	2021-03-03	redhat
redhat	kernel-0:4.18.0-240.15.1.el8_3	2021-02-16	redhat
redhat	kernel-rt-0:4.18.0-240.15.1.rt7.69.el8_3	2021-02-16	redhat
redhat	kernel-alt-0:4.14.0-115.35.1.el7a	2021-02-02	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 19× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-23 04:29 UTCEG score recompute
2026-05-23 04:29 UTCVendor advisory
2026-05-23 04:29 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2020-29661?

CVE-2020-29661 is a high vulnerability published on December 9, 2020. 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.

When was CVE-2020-29661 disclosed?

CVE-2020-29661 was first published in the National Vulnerability Database on December 9, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-29661 actively exploited?

CVE-2020-29661 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 69.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-29661?

CVE-2020-29661 has a CVSS v3 base score of 7.8 (NVD).

How do I remediate CVE-2020-29661?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-29661, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2020-29661

Published

Last Modified

References (22)

Patch Availability(20)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-29661?

Same vendor

Same CWE

CVE-2020-29661

📅 Published

🔄 Last Modified

🔗 References (22)

Patch Availability(20)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-29661?

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References (22)

Frequently asked(5)

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