Bug 1223710 (CVE-2024-27007) - VUL-0: CVE-2024-27007: kernel: userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE
Summary: VUL-0: CVE-2024-27007: kernel: userfaultfd: change src_folio after ensuring i...
Status: RESOLVED FIXED
Alias: CVE-2024-27007
Product: SUSE Security Incidents
Classification: Novell Products
Component: Incidents (show other bugs)
Version: unspecified
Hardware: Other Other
: P3 - Medium : Normal
Target Milestone: ---
Assignee: Security Team bot
QA Contact: Security Team bot
URL: https://smash.suse.de/issue/403775/
Whiteboard: CVSSv3.1:SUSE:CVE-2024-27007:5.5:(AV:...
Keywords:
Depends on:
Blocks:
 
Reported: 2024-05-02 11:30 UTC by SMASH SMASH
Modified: 2024-06-11 10:15 UTC (History)
2 users (show)

See Also:
Found By: Security Response Team
Services Priority:
Business Priority:
Blocker: ---
Marketing QA Status: ---
IT Deployment: ---

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Description SMASH SMASH 2024-05-02 11:30:02 UTC 
In the Linux kernel, the following vulnerability has been resolved:

userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE

Commit d7a08838ab74 ("mm: userfaultfd: fix unexpected change to src_folio
when UFFDIO_MOVE fails") moved the src_folio->{mapping, index} changing to
after clearing the page-table and ensuring that it's not pinned.  This
avoids failure of swapout+migration and possibly memory corruption.

However, the commit missed fixing it in the huge-page case.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-27007
https://www.cve.org/CVERecord?id=CVE-2024-27007
https://git.kernel.org/stable/c/c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50
https://git.kernel.org/stable/c/df5f6e683e7f21a15d8be6e7a0c7a46436963ebe
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-27007.mbox
https://bugzilla.redhat.com/show_bug.cgi?id=2278285
Comment 2 Andrea Mattiazzo 2024-06-11 10:15:54 UTC 
All done, closing.