Home/CVE/A locking issue was discovered in the tty subsystem of the Linux kernel through 5.9.13. drivers/tty/tty_jobctrl.c allows
CVE

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 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.

HIGH · CVSS 7.8 EPSS 0.0059
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-416Use After Free
CWE-667Improper Locking
▤

Affected Products & Versions

17
linux kernel>= 2.6.26 and < 4.4.248
linux kernel>= 4.5 and < 4.9.248
linux kernel>= 4.10 and < 4.14.212
linux kernel>= 4.15 and < 4.19.163
linux kernel>= 4.20 and < 5.4.83
linux kernel>= 5.5 and < 5.9.14
fedoraproject fedoraall versions
debian linuxall versions
⚠

Public Exploits & PoCs

2
pocpacketstormsecurity.com · Linux-TIOCSPGRP-Broken-Locking.htmlpacketstormsecurity.com
pocpacketstormsecurity.com · Kernel-Live-Patch-Security-Notice-LSN-0082-1.htmlpacketstormsecurity.com
▣

Scoring & Timeline

7.8
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD09 Dec 2020 · 05:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

30
suse-csafopenSUSE-SU-2024:10728-1
suse-csafopenSUSE-SU-2024:13704-1
siemens-csafSSA-770721
usnLSN-0082-1
usnUSN-5130-1
🔗

References & Sources

9
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.openwall.com/lists/oss-security/2020/12/10/1Mailing ListPatchThird Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54ffccbf053b5b6ca4f6e45094b942fab92a25fcPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00018.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BOB25SU6XUL4TNP7KB63WNZSYTIYFDPP/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MZ7OAKAEFAXQRGBZK4LYUWINCD3D2XCL/
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