Medium severity · published Dec 9, 2020
CVE-2020-29660
A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel through 5.9.13
4.4
CVSS
0.5%
EPSS
No
On KEV
Description
A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel through 5.9.13. drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may allow a read-after-free attack against TIOCGSID, aka CID-c8bcd9c5be24.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
through 5.9.13 · 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
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-29660
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-29660
Exploit
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
Exploit
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c8bcd9c5be24fb9e6132e97da5a35e55a83e36b9
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
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BOB25SU6XUL4TNP7KB63WNZSYTIYFDPP/
More from Kernel
9.8
CVE-2025-39682
tls: fix handling of zero-length records on the rx_list
8.8
CVE-2026-53266
netfilter: bridge: make ebt_snat ARP rewrite writable
8.8
CVE-2013-6282
Linux Kernel Improper Input Validation Vulnerability
8.4
CVE-2022-0185
Linux Kernel Heap-Based Buffer Overflow Vulnerability
8.4
CVE-2013-2094
Linux Kernel Privilege Escalation Vulnerability