Bug 1623610 (CVE-2018-6554)

Summary: CVE-2018-6554 kernel: irda: Memory leak caused by repeated binds of irda socket
Product: [Other] Security Response Reporter: Pedro Sampaio <psampaio>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: abhgupta, airlied, aquini, bhu, blc, bskeggs, dbaker, dhoward, esammons, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jokerman, jonathan, josef, jross, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, lwang, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, security-response-team, skozina, steved, sthangav, trankin, vdronov, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A memory leak in the irda_bind function in net/irda/af_irda.c in the Linux kernel, through 4.16, allows local users to cause a denial of service due to a memory consumption by repeatedly binding an AF_IRDA socket.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2018-08-30 12:19:10 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:    
Bug Blocks: 1623611    

Description Pedro Sampaio 2018-08-29 18:02:14 UTC 
The irda_bind() function allocates memory for self->ias_obj without
checking to see if the socket is already bound. A userspace process
could repeatedly bind the socket, have each new object added into the
LM-IAS database, and lose the reference to the old object assigned to
the socket to exhaust memory resources.

References:

https://seclists.org/oss-sec/2018/q3/212

Suggested patches:

https://www.spinics.net/lists/stable/msg255033.html

https://www.spinics.net/lists/stable/msg255029.html
Comment 5 Vladis Dronov 2018-08-30 12:19:10 UTC 
Notes:

None of the Red Hat's products are vulnerable to this flaw.