High severity · published Dec 9, 2020
CVE-2020-29661
A locking issue was discovered in the tty subsystem of the Linux kernel through 5.9.13
7.8
CVSS
1.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 66% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
2.6.26 before 4.4.248; 4.5 before 4.9.248; 4.10 before 4.14.212; 4.15 before 4.19.163; 4.20 before 5.4.83; 5.5 before 5.9.14 · source: NVD
8F
8300 Firmware · Netapp
All versions, or not specified · source: NVD
8F
8700 Firmware · Netapp
All versions, or not specified · source: NVD
AF
A400 Firmware · Netapp
All versions, or not specified · source: NVD
AF
A700s Firmware · Netapp
All versions, or not specified · source: NVD
AI
Active IQ Unified Manager · Netapp
All versions, or not specified · source: NVD
DL
Debian Linux · Debian
9.0; 10.0 · source: NVD
FO
Fabric Operating System · Broadcom
All versions, or not specified · source: NVD
FE
Fedora · Fedoraproject
32; 33 · source: NVD
HF
H410c Firmware · Netapp
All versions, or not specified · source: NVD
SB
Solidfire Baseboard Management Controller Firmware · Netapp
All versions, or not specified · source: NVD
TP
Tekelec Platform Distribution · Oracle
7.4.0 through 7.7.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-29661
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-29661
Third Party Advisory
http://packetstormsecurity.com/files/160681/Linux-TIOCSPGRP-Broken-Locking.html
Third Party Advisory
http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html
Mailing List
http://www.openwall.com/lists/oss-security/2020/12/10/1
Patch
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54ffccbf053b5b6ca4f6e45094b942fab92a25fc
Mailing List
https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
Mailing List
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
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