CVE-2020-29661
HIGHCVSS 7.8/10EPSS 1.13%
Last modified
CVE-2020-29661 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 1.13% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 2.6.26, < 4.4.248 |
| Linux | Linux Kernel | >= 4.5, < 4.9.248 |
| Linux | Linux Kernel | >= 4.10, < 4.14.212 |
| Linux | Linux Kernel | >= 4.15, < 4.19.163 |
| Linux | Linux Kernel | >= 4.20, < 5.4.83 |
| Linux | Linux Kernel | >= 5.5, < 5.9.14 |
| Fedoraproject | Fedora | 32 |
| Fedoraproject | Fedora | 33 |
| Debian | Debian Linux | 9.0 |
| Debian | Debian Linux | 10.0 |
| Netapp | Active Iq Unified Manager | All versions |
| Broadcom | Fabric Operating System | All versions |
| Netapp | Solidfire Baseboard Management Controller Firmware | All versions |
| Netapp | H410c Firmware | All versions |
| Netapp | A700s Firmware | All versions |
| Netapp | 8300 Firmware | All versions |
| Netapp | 8700 Firmware | All versions |
| Netapp | A400 Firmware | All versions |
| Oracle | Tekelec Platform Distribution | >= 7.4.0, <= 7.7.1 |
References
- http://packetstormsecurity.com/files/160681/Linux-TIOCSPGRP-Broken-Locking.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.htmlThird Party Advisory, VDB Entry
- http://www.openwall.com/lists/oss-security/2020/12/10/1Mailing List, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/02/msg00018.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210122-0001/Third Party Advisory
- https://www.debian.org/security/2021/dsa-4843Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
- http://packetstormsecurity.com/files/160681/Linux-TIOCSPGRP-Broken-Locking.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.htmlThird Party Advisory, VDB Entry
- http://www.openwall.com/lists/oss-security/2020/12/10/1Mailing List, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/02/msg00018.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210122-0001/Third Party Advisory
- https://www.debian.org/security/2021/dsa-4843Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-29661?
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.
How severe is CVE-2020-29661?
CVE-2020-29661 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.13% probability of exploitation in the next 30 days.
How do I fix CVE-2020-29661?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2020-29661?
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Scan your code nowSource: NVD / NIST