Bug 1933127 (CVE-2020-28588) - CVE-2020-28588 kernel: information leak in the syscall implementation on 32-bit systems
Summary: CVE-2020-28588 kernel: information leak in the syscall implementation on 32-b...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-28588
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1936580 1936912 1936916 1938163
Blocks: 1933129
TreeView+ depends on / blocked
 
Reported: 2021-02-25 18:15 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-11-09 15:33 UTC (History)
41 users (show)

Fixed In Version:
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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.
Clone Of:
Environment:
Last Closed: 2021-11-09 15:33:26 UTC
Embargoed:

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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.
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