Bug 2300482 (CVE-2024-41086)

Summary:	CVE-2024-41086 kernel: bcachefs: Fix sb_field_downgrade validation
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	dfreiber, drow, jburrell, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 6.9.8, kernel 6.10	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the bcachefs module in the Linux kernel. In some conditions, an out-of-bounds read of 2 bytes can be triggered due to an incomplete validation of malformed input, resulting in a denial of service.	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:	2301668
Bug Blocks:

Description OSIDB Bzimport 2024-07-29 16:21:10 UTC

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

bcachefs: Fix sb_field_downgrade validation

- bch2_sb_downgrade_validate() wasn't checking for a downgrade entry
  extending past the end of the superblock section

- for_each_downgrade_entry() is used in to_text() and needs to work on
  malformed input; it also was missing a check for a field extending
  past the end of the section

Comment 1 Mauro Matteo Cascella 2024-07-30 15:16:28 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024072951-CVE-2024-41086-0dba@gregkh/T

Comment 2 Mauro Matteo Cascella 2024-07-30 15:16:48 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2301668]