| 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-2025-21815: mm/compaction: fix UBSAN shift-out-of-bounds warning |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mm/compaction: fix UBSAN shift-out-of-bounds warning |
| |
| syzkaller reported a UBSAN shift-out-of-bounds warning of (1UL << order) |
| in isolate_freepages_block(). The bogus compound_order can be any value |
| because it is union with flags. Add back the MAX_PAGE_ORDER check to fix |
| the warning. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21815 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.7 with commit 3da0272a4c7d0d37b47b28e87014f421296fc2be and fixed in 6.12.14 with commit 4491159774d973a9e2e998d25d8fbb20fada6dfa |
| Issue introduced in 6.7 with commit 3da0272a4c7d0d37b47b28e87014f421296fc2be and fixed in 6.13.3 with commit 10b7d3eb535098ccd4c82a182a33655d8a0e5c88 |
| Issue introduced in 6.7 with commit 3da0272a4c7d0d37b47b28e87014f421296fc2be and fixed in 6.14 with commit d1366e74342e75555af2648a2964deb2d5c92200 |
| |
| 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-2025-21815 |
| 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/compaction.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/4491159774d973a9e2e998d25d8fbb20fada6dfa |
| https://git.kernel.org/stable/c/10b7d3eb535098ccd4c82a182a33655d8a0e5c88 |
| https://git.kernel.org/stable/c/d1366e74342e75555af2648a2964deb2d5c92200 |
