CVE-2020-29661
A public proof of concept exists; no exploitation attested.
- Published2020-12-09
- Fixed in5.9.14 · 5.4.83 · 4.19.163 · 4.14.212 · 4.9.248 · 4.4.248
- WeaknessCWE-416 · CWE-667
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2020-12-0917:15CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-29661?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-29661?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 5.x | ≥ 5.5, < 5.9.14 | 5.9.14 | NVD |
| 5.4 | ≥ 4.20, < 5.4.83 | 5.4.83 | NVD |
| 4.x | ≥ 4.15, < 4.19.163 | 4.19.163 | NVD |
| 4.x | ≥ 4.10, < 4.14.212 | 4.14.212 | NVD |
| 4.x | ≥ 4.5, < 4.9.248 | 4.9.248 | NVD |
| 4.4 | ≥ 2.6.26, < 4.4.248 | 4.4.248 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 9.0 | = 9.0 | no fix published | NVD |
| 10.0 | = 10.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 32.x | = 32 | no fix published | NVD |
| 33.x | = 33 | no fix published | NVD |
9 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
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 4.18.0-240.15.1.el8_3
Fix
- Update Linux linux kernel to 5.9.14 · 5.4.83 · 4.19.163 · 4.14.212 · 4.9.248 · 4.4.248
Advisories and patches
- www.openwall.comPatch
- git.kernel.orgPatch · Vendor Advisory
- www.oracle.comPatch
Detection
read 2026-10-23 19:23 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
Sources
- NVDCVSS 3.17.8read 2026-10-23
- NVDCVSS 2.07.2read 2026-10-23
- NVDweakness (CWE)CWE-416, CWE-667read 2026-10-23
- FIRST EPSSEPSS score1.1 %2026-10-22
- PoC-in-GitHubproof of concept1read 2026-10-23
- OSVaffected packages—
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Published
- 2020-12-09
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2020-29661?
Is CVE-2020-29661 actively exploited?
What is the CVSS score for CVE-2020-29661?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.