01 Record

CVE-2020-29661

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.

UnratedPUBLISHEDCNA: mitre

CNA base scoreUnratedNo CNA CVSS vector

View raw JSON

02 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.

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 1.12% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 66.0% of scored records. A rank, not a probability.
NVD base score: 7.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2020-12-09 16:57Z5 YR AGO

Last updated

2024-08-04 16:55Z2 YR AGO

Reserved

2020-12-09

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

CWE-416Use After FreeVariant
CWE-667Improper LockingClass
CWE-825Expired Pointer DereferenceBase

Data version

5.1

Document digest

185118014f966778c3e9287bbf92c96986fd0cfab37f27240ef0191bbb23ba5e

05 Affected products

VendorProductVersionsPlatforms

broadcomfabric_operating_systemNot specified—

debiandebian_linuxNot specified—

fedoraprojectfedoraNot specified—

linuxlinux_kernelNot specified—

netapp8300Not specified—

netapp8300_firmwareNot specified—

netapp8700Not specified—

netapp8700_firmwareNot specified—

netappa400Not specified—

netappa400_firmwareNot specified—

netappa700sNot specified—

netappa700s_firmwareNot specified—

netappactive_iq_unified_managerNot specified—

netapph410cNot specified—

netapph410c_firmwareNot specified—

netappsolidfire_baseboard_management_controllerNot specified—

netappsolidfire_baseboard_management_controller_firmwareNot specified—

oracletekelec_platform_distributionNot specified—

redhatenterprise_linuxNot specified—

redhatrhel_ausNot specified—

redhatrhel_e4sNot specified—

redhatrhel_elsNot specified—

redhatrhel_eusNot specified—

redhatrhel_extras_rtNot specified—

redhatrhel_tusNot specified—

06 References

git.kernel.orghttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54ffccbf053b5b6ca4f6e45094b942fab92a25fcx_refsource_MISC
www.openwall.com[oss-security] 20201210 2 kernel issueshttp://www.openwall.com/lists/oss-security/2020/12/10/1mailing-listx_refsource_MLIST
lists.fedoraproject.orgFEDORA-2020-b732958765https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MZ7OAKAEFAXQRGBZK4LYUWINCD3D2XCL/vendor-advisoryx_refsource_FEDORA
lists.fedoraproject.orgFEDORA-2020-bc0cc81a7ahttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BOB25SU6XUL4TNP7KB63WNZSYTIYFDPP/vendor-advisoryx_refsource_FEDORA
www.debian.orgDSA-4843https://www.debian.org/security/2021/dsa-4843vendor-advisoryx_refsource_DEBIAN
lists.debian.org[debian-lts-announce] 20210212 [SECURITY] [DLA 2557-1] linux-4.19 security updatehttps://lists.debian.org/debian-lts-announce/2021/02/msg00018.htmlmailing-listx_refsource_MLIST
lists.debian.org[debian-lts-announce] 20210309 [SECURITY] [DLA 2586-1] linux security updatehttps://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlmailing-listx_refsource_MLIST
www.oracle.comhttps://www.oracle.com/security-alerts/cpuoct2021.htmlx_refsource_MISC
packetstormsecurity.comhttp://packetstormsecurity.com/files/160681/Linux-TIOCSPGRP-Broken-Locking.htmlx_refsource_MISC
security.netapp.comhttps://security.netapp.com/advisory/ntap-20210122-0001/x_refsource_CONFIRM
packetstormsecurity.comhttp://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.htmlx_refsource_MISC

07 Fixed in

AlmaLinux 8

kernel-tools-libs-devel
Fixed in 4.18.0-240.15.1.el8_3

Arch Linux

linux
Fixed in 5.9.14.arch1-1

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

CloudLinux 8

kernel-tools-libs-devel
Fixed in 4.18.0-240.15.1.el8_3

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Debian 12

linux
Fixed in 5.9.15-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 5.9.15-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 5.9.15-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.