Bug 1875818 (CVE-2020-29373)

Summary: CVE-2020-29373 kernel: Insecure handling of root directory for path lookups via io_uring
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: acaringi, airlied, bhu, blc, bmasney, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, gsuckevi, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jross, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mcressma, mjg59, mlangsdo, nmurray, ptalbert, qzhao, rt-maint, rvrbovsk, steved, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Clone Of: Environment:
Last Closed: 2020-10-01 14:21:10 UTC Type: ---
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1887419, 1887420, 1887423    
Bug Blocks: 1870582, 1903292    

Description Pedro Sampaio 2020-09-04 13:05:11 UTC 
A flaw was found in Linux kernel. Insecure handling of root directory for path lookups in io_uring may lead to a process inside a mount namespace to gain access to the filesystem outside of it.

References:

https://bugs.chromium.org/p/project-zero/issues/detail?id=2011
Comment 2 Petr Matousek 2020-10-12 12:22:57 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1887423]
Comment 3 Justin M. Forbes 2020-10-12 15:42:24 UTC 
This was fixed for Fedora with 5.4.24 stable kernel updates.
Comment 4 Petr Matousek 2020-12-10 12:26:45 UTC 
*** Bug 1903291 has been marked as a duplicate of this bug. ***