Bug 1611005 (CVE-2018-14734)

Summary: CVE-2018-14734 kernel: use-after-free in ucma_leave_multicast in drivers/infiniband/core/ucma.c
Product: [Other] Security Response Reporter: Laura Pardo <lpardo>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: abhgupta, airlied, aquini, bhu, blc, bskeggs, dbaker, dhoward, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jokerman, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mguzik, mjg59, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, skozina, steved, sthangav, trankin, vdronov, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: kernel 4.18-rc1 Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux Kernel in the ucma_leave_multicast() function in drivers/infiniband/core/ucma.c which allows access to a certain data structure after freeing it in ucma_process_join(). This allows an attacker to cause a use-after-free bug and to induce kernel memory corruption, leading to a system crash or other unspecified impact. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2019-06-10 10:34:59 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: 1611007, 1611008, 1615040, 1615041, 1615042, 1615043, 1772242, 1772243, 1772244, 1772245    
Bug Blocks: 1611009    

Description Laura Pardo 2018-08-01 21:44:35 UTC 
A flaw was found in Linux Kernel in the ucma_leave_multicast() function in drivers/infiniband/core/ucma.c which allows to access a certain data structure after freeing it in ucma_process_join(). This allows an attacker to cause use-after-free bug and to induce kernel memory corruption, leading to a system crash or other unspecified impact.

References:

https://marc.info/?t=152787806300002&r=1&w=2

https://patchwork.kernel.org/patch/10444267/

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cb2595c1393b4a5211534e6f0a0fbad369e21ad8
Comment 1 Laura Pardo 2018-08-01 21:57:02 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1611007]
Comment 6 errata-xmlrpc 2019-04-23 14:30:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:0831 https://access.redhat.com/errata/RHSA-2019:0831
Comment 7 errata-xmlrpc 2019-08-06 12:04:12 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:2029 https://access.redhat.com/errata/RHSA-2019:2029
Comment 8 errata-xmlrpc 2019-08-06 12:06:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:2043 https://access.redhat.com/errata/RHSA-2019:2043