| 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-2025-21724: iommufd/iova_bitmap: Fix shift-out-of-bounds in iova_bitmap_offset_to_index() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| iommufd/iova_bitmap: Fix shift-out-of-bounds in iova_bitmap_offset_to_index() |
| |
| Resolve a UBSAN shift-out-of-bounds issue in iova_bitmap_offset_to_index() |
| where shifting the constant "1" (of type int) by bitmap->mapped.pgshift |
| (an unsigned long value) could result in undefined behavior. |
| |
| The constant "1" defaults to a 32-bit "int", and when "pgshift" exceeds |
| 31 (e.g., pgshift = 63) the shift operation overflows, as the result |
| cannot be represented in a 32-bit type. |
| |
| To resolve this, the constant is updated to "1UL", promoting it to an |
| unsigned long type to match the operand's type. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21724 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.1 with commit 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 and fixed in 6.1.129 with commit 44d9c94b7a3f29a3e07c4753603a35e9b28842a3 |
| Issue introduced in 6.1 with commit 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 and fixed in 6.6.76 with commit 38ac76fc06bc6826a3e4b12a98efbe98432380a9 |
| Issue introduced in 6.1 with commit 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 and fixed in 6.12.13 with commit d5d33f01b86af44b23eea61ee309e4ef22c0cdfe |
| Issue introduced in 6.1 with commit 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 and fixed in 6.13.2 with commit b1f8453b8ff1ab79a03820ef608256c499769cb6 |
| Issue introduced in 6.1 with commit 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 and fixed in 6.14 with commit e24c1551059268b37f6f40639883eafb281b8b9c |
| |
| 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-2025-21724 |
| 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: |
| drivers/iommu/iommufd/iova_bitmap.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/44d9c94b7a3f29a3e07c4753603a35e9b28842a3 |
| https://git.kernel.org/stable/c/38ac76fc06bc6826a3e4b12a98efbe98432380a9 |
| https://git.kernel.org/stable/c/d5d33f01b86af44b23eea61ee309e4ef22c0cdfe |
| https://git.kernel.org/stable/c/b1f8453b8ff1ab79a03820ef608256c499769cb6 |
| https://git.kernel.org/stable/c/e24c1551059268b37f6f40639883eafb281b8b9c |
