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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

Related Resources (18)

https://www.debian.org/security/2021/dsa-4843
https://security-tracker.debian.org/tracker/CVE-2020-29661
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BOB25SU6XUL4TNP7KB63WNZSYTIYFDPP/
http://www.openwall.com/lists/oss-security/2020/12/10/1
https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html
https://nvd.nist.gov/vuln/detail/CVE-2020-29661
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MZ7OAKAEFAXQRGBZK4LYUWINCD3D2XCL/
https://security.netapp.com/advisory/ntap-20210122-0001/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BOB25SU6XUL4TNP7KB63WNZSYTIYFDPP/
http://packetstormsecurity.com/files/160681/Linux-TIOCSPGRP-Broken-Locking.html
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54ffccbf053b5b6ca4f6e45094b942fab92a25fc
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MZ7OAKAEFAXQRGBZK4LYUWINCD3D2XCL/
https://people.canonical.com/~ubuntu-security/cve/CVE-2020-29661
https://www.oracle.com/security-alerts/cpuoct2021.html
https://access.redhat.com/security/cve/CVE-2020-29661
https://www.mend.io/vulnerability-database/CVE-2020-29661

Severity Score

Weakness Type (CWE)

Use After Free

CWE-416

Improper Locking

CWE-667

Top Fix

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CVSS v3.1

Base Score:
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:
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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