Bug 1993517 (CVE-2021-38604) - CVE-2021-38604 glibc: NULL pointer dereference in helper_thread() in mq_notify.c while handling NOTIFY_REMOVED messages
Summary: CVE-2021-38604 glibc: NULL pointer dereference in helper_thread() in mq_notif...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-38604
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: 1993518 1994264
Blocks: 1993519
TreeView+ depends on / blocked
 
Reported: 2021-08-13 17:19 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-05-17 13:45 UTC (History)
23 users (show)

Fixed In Version:
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Doc Text:
A flaw was found in the GNU C library (glibc), where the sysdeps/unix/sysv/linux/mq_notify.c function mishandles certain NOTIFY_REMOVED data, leading to a NULL pointer dereference. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2022-05-17 13:45:12 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2021-08-13 17:19:02 UTC 
In librt in the GNU C Library (aka glibc) through 2.34, sysdeps/unix/sysv/linux/mq_notify.c mishandles certain NOTIFY_REMOVED data, leading to a NULL pointer dereference. NOTE: this vulnerability was introduced as a side effect of the CVE-2021-33574 fix.

Reference:
https://sourceware.org/bugzilla/show_bug.cgi?id=28213

Upstream patches:
https://sourceware.org/git/?p=glibc.git;a=commit;h=4cc79c217744743077bf7a0ec5e0a4318f1e6641
https://sourceware.org/git/?p=glibc.git;a=commit;h=b805aebd42364fe696e417808a700fdb9800c9e8
Comment 1 Guilherme de Almeida Suckevicz 2021-08-13 17:19:54 UTC 
Created glibc tracking bugs for this issue:

Affects: fedora-all [bug 1993518]
Comment 7 Product Security DevOps Team 2022-05-17 13:45:09 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-2021-38604
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