Bug 1986473 (CVE-2021-3669) - CVE-2021-3669 kernel: reading /proc/sysvipc/shm does not scale with large shared memory segment counts
Summary: CVE-2021-3669 kernel: reading /proc/sysvipc/shm does not scale with large sha...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-3669
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1987128 1987129 1987130 1988923
Blocks: 1985504
TreeView+ depends on / blocked
 
Reported: 2021-07-27 16:25 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-06-16 11:22 UTC (History)
44 users (show)

Fixed In Version:
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Doc Text:
A flaw was found in the Linux kernel. Measuring usage of the shared memory does not scale with large shared memory segment counts which could lead to resource exhaustion and DoS.
Clone Of:
Environment:
Last Closed: 2022-05-11 08:15:34 UTC

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2022:2229 0 None None None 2022-05-12 11:26:22 UTC
Red Hat Product Errata RHBA-2022:4630 0 None None None 2022-05-18 11:46:09 UTC
Red Hat Product Errata RHBA-2022:4693 0 None None None 2022-05-19 05:10:34 UTC
Red Hat Product Errata RHBA-2022:4969 0 None None None 2022-06-08 18:39:39 UTC
Red Hat Product Errata RHBA-2022:5088 0 None None None 2022-06-16 11:22:56 UTC
Red Hat Product Errata RHSA-2022:1975 0 None Closed [RHEL8.4/IPA/Bug] Circular loop in case of IPA installation error that requires ipa-replica-manage which requires a succ... 2022-06-10 13:19:17 UTC
Red Hat Product Errata RHSA-2022:1988 0 None None None 2022-05-10 14:45:00 UTC

Description Guilherme de Almeida Suckevicz 2021-07-27 16:25:21 UTC 
A flaw was found in the Linux kernel. Reading /proc/sysvipc/shm does not scale with large shared memory segment counts which could lead to resource exhaustion and DoS.
Comment 8 Wade Mealing 2021-08-02 06:04:00 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1988923]
Comment 9 Salvatore Bonaccorso 2021-08-03 17:02:08 UTC 
Has this issue been reported upstream? Is there any reference to it?
Comment 10 Wade Mealing 2021-08-04 00:47:38 UTC 
Not reported upstream, patches are being worked on.  It is not considered high impact because of the requirements and need to have massive amount of shm (usually well above ulimits) 

Product bug https://bugzilla.redhat.com/show_bug.cgi?id=1980619
Comment 11 Guilherme de Almeida Suckevicz 2021-08-04 12:57:59 UTC 
In reply to comment #9:
> Has this issue been reported upstream? Is there any reference to it?

Please see comment#10.
Thanks.
Comment 13 Justin M. Forbes 2022-01-05 14:43:32 UTC 
This was fixed for Fedora with the 5.15.x kernel rebases.
Comment 14 errata-xmlrpc 2022-05-10 14:39:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1975 https://access.redhat.com/errata/RHSA-2022:1975
Comment 15 errata-xmlrpc 2022-05-10 14:44:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1988 https://access.redhat.com/errata/RHSA-2022:1988
Comment 16 Product Security DevOps Team 2022-05-11 08:15:31 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-3669
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