Bug 1906525 (CVE-2020-29661)

Summary: CVE-2020-29661 kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free
Product: [Other] Security Response Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: acaringi, adscvr, airlied, asavkov, bdettelb, bhu, blc, bmasney, brdeoliv, bskeggs, dhoward, dvlasenk, fhrbata, hdegoede, hkrzesin, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, joe.lawrence, jonathan, josef, jpoimboe, jshortt, jstancek, jthierry, jwboyer, kcarcia, kernel-maint, kernel-mgr, kmullins, kpatch-maint, lgoncalv, linville, masami256, mchehab, mlangsdo, nmurray, ptalbert, qzhao, rhandlin, rvrbovsk, steved, tomckay, walters, williams, wmealing, ycote, yozone
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
A locking vulnerability was found in the tty subsystem of the Linux kernel in drivers/tty/tty_jobctrl.c. This flaw allows a local attacker to possibly corrupt memory or escalate privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
Story Points: ---
Clone Of: Environment:
Last Closed: 2021-02-02 14:42:03 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1906526, 1908191, 1908192, 1908193, 1908194, 1908195, 1908196, 1908197, 1908198, 1908199, 1908200, 1908201, 1908202, 1908203, 1908204, 1908205, 1908206, 1908207, 1908208, 1908209, 1908210, 1908241, 1908242, 1908243, 1908244, 1908245, 1908246, 1935468, 1948465    
Bug Blocks: 1906527    

Description Guilherme de Almeida Suckevicz 2020-12-10 17:42:01 UTC
A locking issue was discovered in the tty subsystem of the Linux kernel in drivers/tty/tty_jobctrl.c which could allow an attacker with a local account to possibly corrupt memory or escalate privileges. 

Reference and upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54ffccbf053b5b6ca4f6e45094b942fab92a25fc

Comment 1 Guilherme de Almeida Suckevicz 2020-12-10 17:42:39 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1906526]

Comment 6 Petr Matousek 2020-12-15 15:55:31 UTC
Mitigation:

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Comment 11 errata-xmlrpc 2021-02-02 10:11:40 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2021:0354 https://access.redhat.com/errata/RHSA-2021:0354

Comment 12 Product Security DevOps Team 2021-02-02 14:42:03 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-29661

Comment 13 errata-xmlrpc 2021-02-16 14:25:40 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:0537 https://access.redhat.com/errata/RHSA-2021:0537

Comment 14 errata-xmlrpc 2021-02-16 14:38:16 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:0558 https://access.redhat.com/errata/RHSA-2021:0558

Comment 15 errata-xmlrpc 2021-03-02 10:42:05 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Extended Update Support

Via RHSA-2021:0686 https://access.redhat.com/errata/RHSA-2021:0686

Comment 16 errata-xmlrpc 2021-03-02 10:43:33 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Extended Update Support

Via RHSA-2021:0689 https://access.redhat.com/errata/RHSA-2021:0689

Comment 20 errata-xmlrpc 2021-03-09 09:34:50 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2021:0763 https://access.redhat.com/errata/RHSA-2021:0763

Comment 21 errata-xmlrpc 2021-03-09 10:22:47 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2021:0774 https://access.redhat.com/errata/RHSA-2021:0774

Comment 22 errata-xmlrpc 2021-03-09 11:09:54 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2021:0765 https://access.redhat.com/errata/RHSA-2021:0765

Comment 23 errata-xmlrpc 2021-03-16 13:51:25 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2021:0856 https://access.redhat.com/errata/RHSA-2021:0856

Comment 24 errata-xmlrpc 2021-03-16 13:52:17 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2021:0857 https://access.redhat.com/errata/RHSA-2021:0857

Comment 25 errata-xmlrpc 2021-03-16 13:54:37 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2021:0862 https://access.redhat.com/errata/RHSA-2021:0862

Comment 26 errata-xmlrpc 2021-03-16 14:53:42 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.6 Extended Update Support

Via RHSA-2021:0878 https://access.redhat.com/errata/RHSA-2021:0878

Comment 28 errata-xmlrpc 2021-03-18 16:45:14 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.6 Extended Update Support

Via RHSA-2021:0940 https://access.redhat.com/errata/RHSA-2021:0940

Comment 29 errata-xmlrpc 2021-03-30 09:28:01 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.7 Extended Update Support

Via RHSA-2021:1028 https://access.redhat.com/errata/RHSA-2021:1028

Comment 30 errata-xmlrpc 2021-03-30 09:29:32 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.7 Extended Update Support

Via RHSA-2021:1031 https://access.redhat.com/errata/RHSA-2021:1031

Comment 32 errata-xmlrpc 2021-04-20 15:12:55 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6 Extended Lifecycle Support

Via RHSA-2021:1288 https://access.redhat.com/errata/RHSA-2021:1288

Comment 33 errata-xmlrpc 2021-06-01 08:45:04 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.4 Advanced Update Support
  Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions
  Red Hat Enterprise Linux 7.4 Telco Extended Update Support

Via RHSA-2021:2164 https://access.redhat.com/errata/RHSA-2021:2164