Bug 2047912 (CVE-2021-22600) - CVE-2021-22600 kernel: double free in packet_set_ring() in net/packet/af_packet.c
Summary: CVE-2021-22600 kernel: double free in packet_set_ring() in net/packet/af_pack...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-22600
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: 2050248 2050329 2050330
Blocks: 2047909
TreeView+ depends on / blocked
 
Reported: 2022-01-28 20:38 UTC by Todd Cullum
Modified: 2023-05-16 13:32 UTC (History)
48 users (show)

Fixed In Version: kernel 5.16-rc6
Doc Type: If docs needed, set a value
Doc Text:
A double-free flaw was found in the Linux kernel’s packet protocol subsystem in the way a user call triggers the packet_set_ring() function of the net/packet/af_packet.c. This flaw allows a local user to crash or escalate their privileges on the system.
Clone Of:
Environment:
Last Closed: 2022-05-17 13:46:48 UTC
Embargoed:

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Description Todd Cullum 2022-01-28 20:38:49 UTC 
A double free bug in packet_set_ring() in net/packet/af_packet.c can be
exploited by a local user through crafted syscalls to escalate privileges or
deny service.

Reference & upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28f0f2dda1a6a33b14cd57e36a9755
Comment 2 Alex 2022-02-03 14:29:44 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2050248]
Comment 5 Justin M. Forbes 2022-02-03 23:14:04 UTC 
This was fixed for Fedora with the 5.15.11 stable kernel updates.
Comment 14 Product Security DevOps Team 2022-05-17 13:46:45 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-2021-22600
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