Bug 1933127 (CVE-2020-28588)

Summary: CVE-2020-28588 kernel: information leak in the syscall implementation on 32-bit systems
Product: [Other] Security Response Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: acaringi, adscvr, airlied, alciregi, bdettelb, bhu, blc, bmasney, brdeoliv, bskeggs, chwhite, dhoward, dvlasenk, fhrbata, hdegoede, hkrzesin, jarodwilson, jeremy, jforbes, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mlangsdo, nmurray, ptalbert, qzhao, rvrbovsk, steved, tomckay, walters, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
A flaw read uninitialized values in the Linux kernel syscall implementation on 32 bit-systems was found in the way user reading /proc/self/syscall. A local user could use this flaw to read three 64 bits uninitialized values, but cannot control which values. The highest threat from this vulnerability is to confidentiality.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2021-11-09 15:33:26 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: 1936580, 1936912, 1936916, 1938163    
Bug Blocks: 1933129    

Description Guilherme de Almeida Suckevicz 2021-02-25 18:15:22 UTC 
It was discovered that an information leak existed in the syscall implementation in the Linux kernel on 32 bit systems. A local attacker could use this to expose sensitive information (kernel memory).

Reference and upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4f134b89a24b965991e7c345b9a4591821f7c2a6
Comment 1 Alex 2021-03-08 19:05:42 UTC 
External References:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4f134b89a24b965991e7c345b9a4591821f7c2a6
Comment 2 Alex 2021-03-08 19:06:35 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1936580]
Comment 5 Justin M. Forbes 2021-03-09 17:07:18 UTC 
This was fixed for Fedora with the 5.9.14 stable kernel updates.