| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-27007: userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE |
| |
| 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. |
| |
| The Linux kernel CVE team has assigned CVE-2024-27007 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.8 with commit adef440691bab824e39c1b17382322d195e1fab0 and fixed in 6.8.8 with commit df5f6e683e7f21a15d8be6e7a0c7a46436963ebe |
| Issue introduced in 6.8 with commit adef440691bab824e39c1b17382322d195e1fab0 and fixed in 6.9 with commit c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-27007 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| mm/huge_memory.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/df5f6e683e7f21a15d8be6e7a0c7a46436963ebe |
| https://git.kernel.org/stable/c/c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50 |
