Bug 2181614 (CVE-2020-36691) - CVE-2020-36691 kernel: lib/nlattr.c allows attackers to cause a denial of service
Summary: CVE-2020-36691 kernel: lib/nlattr.c allows attackers to cause a denial of ser...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-36691
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:
Blocks: 2181615
TreeView+ depends on / blocked
 
Reported: 2023-03-24 19:23 UTC by Pedro Sampaio
Modified: 2023-03-27 14:32 UTC (History)
44 users (show)

Fixed In Version: Kernel 5.8 RC1
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in lib/nlattr.c in the Linux kernel, before 5.8. This issue may allow an attacker to cause a denial of service (unbounded recursion) through a nested Netlink policy with a back reference.
Clone Of:
Environment:
Last Closed: 2023-03-26 18:05:46 UTC
Embargoed:


Attachments (Terms of Use)

Description Pedro Sampaio 2023-03-24 19:23:17 UTC
An issue was discovered in the Linux kernel before 5.8. lib/nlattr.c allows attackers to cause a denial of service (unbounded recursion) via a nested Netlink policy with a back reference.

References:

https://github.com/torvalds/linux/commit/7690aa1cdf7c4565ad6b013b324c28b685505e24
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8

Comment 1 Rohit Keshri 2023-03-26 14:04:03 UTC
The affected code was not introduced into any kernel versions shipped with Red Hat Enterprise Linux making this vulnerable not applicable to these platforms.

Comment 4 Product Security DevOps Team 2023-03-26 18:05:42 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-2020-36691


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