| 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-2025-21734: misc: fastrpc: Fix copy buffer page size |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| misc: fastrpc: Fix copy buffer page size |
| |
| For non-registered buffer, fastrpc driver copies the buffer and |
| pass it to the remote subsystem. There is a problem with current |
| implementation of page size calculation which is not considering |
| the offset in the calculation. This might lead to passing of |
| improper and out-of-bounds page size which could result in |
| memory issue. Calculate page start and page end using the offset |
| adjusted address instead of absolute address. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21734 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.2 with commit 02b45b47fbe84e23699bb6bdc74d4c2780e282b4 and fixed in 6.1.129 with commit c56ba3ea8e3c9a69a992aad18f7a65e43e51d623 |
| Issue introduced in 5.2 with commit 02b45b47fbe84e23699bb6bdc74d4c2780e282b4 and fixed in 6.6.78 with commit c0464bad0e85fcd5d47e4297d1e410097c979e55 |
| Issue introduced in 5.2 with commit 02b45b47fbe84e23699bb6bdc74d4c2780e282b4 and fixed in 6.12.14 with commit 24a79c6bc8de763f7c50f4f84f8b0c183bc25a51 |
| Issue introduced in 5.2 with commit 02b45b47fbe84e23699bb6bdc74d4c2780e282b4 and fixed in 6.13.3 with commit c3f7161123fcbdc64e90119ccce292d8b66281c4 |
| Issue introduced in 5.2 with commit 02b45b47fbe84e23699bb6bdc74d4c2780e282b4 and fixed in 6.14 with commit e966eae72762ecfdbdb82627e2cda48845b9dd66 |
| |
| 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-2025-21734 |
| 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/misc/fastrpc.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/c56ba3ea8e3c9a69a992aad18f7a65e43e51d623 |
| https://git.kernel.org/stable/c/c0464bad0e85fcd5d47e4297d1e410097c979e55 |
| https://git.kernel.org/stable/c/24a79c6bc8de763f7c50f4f84f8b0c183bc25a51 |
| https://git.kernel.org/stable/c/c3f7161123fcbdc64e90119ccce292d8b66281c4 |
| https://git.kernel.org/stable/c/e966eae72762ecfdbdb82627e2cda48845b9dd66 |
