Bug 2258475 (CVE-2024-0562)

Summary: CVE-2024-0562 kernel: use-after-free after removing device in wb_inode_writeback_end in mm/page-writeback.c
Product: [Other] Security Response Reporter: Rohit Keshri <rkeshri>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: acaringi, allarkin, bhu, chwhite, cye, cyin, dbohanno, debarbos, dfreiber, drow, dvlasenk, ezulian, gsuckevi, hkrzesin, jarod, jburrell, jdenham, jfaracco, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, ldoskova, lee, lgoncalv, lzampier, mmilgram, mstowell, nmurray, ptalbert, rparrazo, rrobaina, rvrbovsk, scweaver, tglozar, vkumar, wcosta, williams, wmealing, ycote, ykopkova, zhijwang
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: kernel 6.0-rc3 Doc Type: If docs needed, set a value
Doc Text:
A use-after-free flaw was found in the Linux Kernel. When a disk is removed, bdi_unregister is called to stop further write-back and waits for associated delayed work to complete. However, wb_inode_writeback_end() may schedule bandwidth estimation work after this has completed, which can result in the timer attempting to access the recently freed bdi_writeback.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2258473    

Description Rohit Keshri 2024-01-15 15:08:41 UTC 
A use-after-free problem was found when a disk is removed, bdi_unregister gets called to stop further writeback and wait for associated delayed work to complete. However, wb_inode_writeback_end() may schedule bandwidth estimation dwork after this has completed, which can result in the timer attempting to access the just freed bdi_writeback.

Refer:
https://patchwork.kernel.org/project/linux-mm/patch/20220801155034.3772543-1-khazhy@google.com/
Comment 5 errata-xmlrpc 2024-01-24 16:45:30 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Extended Update Support

Via RHSA-2024:0412 https://access.redhat.com/errata/RHSA-2024:0412
Comment 6 Joel Hardin 2024-01-26 02:09:20 UTC Comment hidden (spam)
Comment 7 Lee Jones 2024-02-06 13:59:07 UTC 
Why are you raising CVEs for issues that were fixed and backported 18 months ago?

This is wasting a lot of people's precious time.
Comment 8 Alex 2024-02-11 15:28:37 UTC 
In reply to comment #7:
> Why are you raising CVEs for issues that were fixed and backported 18 months
> ago?
> 
> This is wasting a lot of people's precious time.

This one is for backport to older versions of Red Hat Linux, because original request was:
"reported experiencing a UAF in RHEL8.6."

(and it is not actual for version 8.8 and later, because the patch already applied there at the moment of this report).
Comment 12 Charmaine9x 2024-03-19 03:33:51 UTC Comment hidden (spam)