Bug 1201887 (CVE-2011-5321)

Summary: CVE-2011-5321 Kernel: tty: driver reference leakage in tty_open
Product: [Other] Security Response Reporter: Prasad Pandit <ppandit>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aquini, bhu, carnil, dhoward, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, madhu.chinakonda, matt, mchehab, mcressma, nmurray, plougher, rt-maint, rvrbovsk, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
A NULL pointer dereference flaw was found in the way the Linux kernel's virtual console implementation handled reference counting when accessing pseudo-terminal device files (/dev/pts/*). A local, unprivileged attacker could use this flaw to crash the system.
Story Points: ---
Clone Of: Environment:
Last Closed: 2019-06-08 02:39:38 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1201893, 1201894    
Bug Blocks: 1067898    

Description Prasad Pandit 2015-03-13 17:50:28 UTC
Linux kernel built with the virtual console support(CONFIG_VT) is vulnerable
to a NULL pointer dereference issue. It could occur while accessing pseudo
terminal device(/dev/pts/*) files.

An unprivileged user could use this flaw to crash the system kernel resulting
in DoS.

Upstream fix:
  -> https://git.kernel.org/linus/c290f8358acaeffd8e0c551ddcc24d1206143376

Comment 1 Prasad Pandit 2015-03-13 18:02:45 UTC

This issue does not affect the versions of the kernel package as shipped with
Red Hat Enterprise Linux 5, 7 and Red Hat Enterprise MRG 2.

This issue affects the version of Linux kernel as shipped with Red Hat
Enterprise Linux 6. Future kernel updates for Red Hat Enterprise Linux 6
may address this issue.

Comment 4 errata-xmlrpc 2015-07-14 15:12:39 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2015:1221 https://rhn.redhat.com/errata/RHSA-2015-1221.html