Bug 2324886 (CVE-2024-50251)

Summary:	CVE-2024-50251 kernel: netfilter: nft_payload: sanitize offset and length before calling skb_checksum()
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dfreiber, drow, jburrell, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	An incorrect buffer length flaw was found in the Linux kernel's netfilter subsystem. A local user could trigger the nft_payload_set_eval function and use this issue to crash the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2325108
Bug Blocks:

Description OSIDB Bzimport 2024-11-09 11:03:17 UTC

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nft_payload: sanitize offset and length before calling skb_checksum()

If access to offset + length is larger than the skbuff length, then
skb_checksum() triggers BUG_ON().

skb_checksum() internally subtracts the length parameter while iterating
over skbuff, BUG_ON(len) at the end of it checks that the expected
length to be included in the checksum calculation is fully consumed.

Comment 1 Avinash Hanwate 2024-11-11 06:11:26 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024110937-CVE-2024-50251-66dc@gregkh/T

Comment 3 errata-xmlrpc 2024-12-11 00:59:05 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:10939 https://access.redhat.com/errata/RHSA-2024:10939