Bug 2301462 (CVE-2024-42099)

Summary:	CVE-2024-42099 kernel: s390/dasd: Fix invalid dereferencing of indirect CCW data pointer
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:	kernel 6.9.9, kernel 6.10	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in the `s390/dasd` subsystem in the Linux Kernel, where an invalid dereferencing of an indirect Channel Command Word (CCW) data pointer could cause a kernel panic. The issue occurs due to the CCW Command Data Address (CDA) pointer used with indirect addressing (IDAW), which needs proper translation from physical to virtual memory.	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:	2301757
Bug Blocks:

Description OSIDB Bzimport 2024-07-30 08:20:25 UTC

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

s390/dasd: Fix invalid dereferencing of indirect CCW data pointer

Fix invalid dereferencing of indirect CCW data pointer in
dasd_eckd_dump_sense() that leads to a kernel panic in error cases.

When using indirect addressing for DASD CCWs (IDAW) the CCW CDA pointer
does not contain the data address itself but a pointer to the IDAL.
This needs to be translated from physical to virtual as well before
using it.

This dereferencing is also used for dasd_page_cache and also fixed
although it is very unlikely that this code path ever gets used.

Comment 1 Mauro Matteo Cascella 2024-07-30 18:09:33 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024073018-CVE-2024-42099-d7b7@gregkh/T

Comment 2 Mauro Matteo Cascella 2024-07-30 18:09:54 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2301757]