HOMEVULNERABILITIESCVE-2020-29660
MEDIUM

CVE-2020-29660

CWE-416Published: December 9, 2020· Updated: Jun 17, 2026

4.4
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2020-29660 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 4.4.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.High
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

broadcom1 product(s)
fabric operating system
Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
Linux1 product(s)
linux kernel
netapp13 product(s)
active iq unified managersolidfire baseboard management controller firmwaresolidfire baseboard management controllerh410c firmwareh410ca700s firmwarea700s8300 firmware83008700 firmware8700a400 firmware+1
Source: NVD CPE · 19 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttp://www.openwall.com/lists/oss-security/2020/12/10/1
PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c8bcd9c5be24fb9e6132e97da5a35e55a83e36b9
PATCHhttp://www.openwall.com/lists/oss-security/2020/12/10/1
PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c8bcd9c5be24fb9e6132e97da5a35e55a83e36b9
ADVISORYhttp://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20210122-0001/
ADVISORYhttps://www.debian.org/security/2021/dsa-4843
ADVISORYhttp://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20210122-0001/
ADVISORYhttps://www.debian.org/security/2021/dsa-4843

All References (18)

→
http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.htmlExploit · Third Party Advisory · VDB Entry
→
http://www.openwall.com/lists/oss-security/2020/12/10/1Mailing List · Patch · Third Party Advisory
→
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c8bcd9c5be24fb9e6132e97da5a35e55a83e36b9Exploit · Patch · Vendor Advisory
→
https://lists.debian.org/debian-lts-announce/2021/02/msg00018.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing List · Third 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/
→
https://security.netapp.com/advisory/ntap-20210122-0001/Third Party Advisory
→
https://www.debian.org/security/2021/dsa-4843Third Party Advisory
→
http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.htmlExploit · Third Party Advisory · VDB Entry
→
http://www.openwall.com/lists/oss-security/2020/12/10/1Mailing List · Patch · Third Party Advisory
→
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c8bcd9c5be24fb9e6132e97da5a35e55a83e36b9Exploit · Patch · Vendor Advisory
→
https://lists.debian.org/debian-lts-announce/2021/02/msg00018.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BOB25SU6XUL4TNP7KB63WNZSYTIYFDPP/

Quick Facts

CVE IDCVE-2020-29660
CVSS Score4.4 / 10
SeverityMEDIUM
WeaknessCWE-416
CISA KEVNo
Affected5 vendor(s)
PublishedDec 9, 2020

Related CVEs (CWE-416)

CVE-2015-3107
10.0
CVE-2010-2302
10.0
CVE-2024-43102
10.0
CVE-2010-2300
10.0
CVE-2026-13782
10.0
CVE-2010-3252
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-29660 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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