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CVE-2020-29661

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Date: 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.

Language: C

Severity Score

7.8

Related Resources (18)

Url: https://www.debian.org/security/2021/dsa-4843

Url: https://security-tracker.debian.org/tracker/CVE-2020-29661

Url: https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html

Url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BOB25SU6XUL4TNP7KB63WNZSYTIYFDPP/

Url: http://www.openwall.com/lists/oss-security/2020/12/10/1

Url: https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html

Url: http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html

Url: https://nvd.nist.gov/vuln/detail/CVE-2020-29661

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MZ7OAKAEFAXQRGBZK4LYUWINCD3D2XCL/

Url: https://security.netapp.com/advisory/ntap-20210122-0001/

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BOB25SU6XUL4TNP7KB63WNZSYTIYFDPP/

Url: http://packetstormsecurity.com/files/160681/Linux-TIOCSPGRP-Broken-Locking.html

Url: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54ffccbf053b5b6ca4f6e45094b942fab92a25fc

Url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MZ7OAKAEFAXQRGBZK4LYUWINCD3D2XCL/

Url: https://people.canonical.com/~ubuntu-security/cve/CVE-2020-29661

Url: https://www.oracle.com/security-alerts/cpuoct2021.html

Url: https://access.redhat.com/security/cve/CVE-2020-29661

Url: https://www.mend.io/vulnerability-database/CVE-2020-29661

Severity Score

7.8

Weakness Type (CWE)

Use After Free

CWE-416

Improper Locking

CWE-667

CVSS v3.1

Base Score:	7.8
Attack Vector (AV):	LOCAL
Attack Complexity (AC):	LOW
Privileges Required (PR):	LOW
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	HIGH
Integrity (I):	HIGH
Availability (A):	HIGH

CVSS v2

Base Score:	7.2
Access Vector (AV):	LOCAL
Access Complexity (AC):	LOW
Authentication (AU):	NONE
Confidentiality (C):	COMPLETE
Integrity (I):	COMPLETE
Availability (A):	COMPLETE
Additional information:

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