CVE-2024-27007 Information

Description

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.

Reference

https://git.kernel.org/stable/c/df5f6e683e7f21a15d8be6e7a0c7a46436963ebe https://git.kernel.org/stable/c/c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/