| 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-2025-21742: usbnet: ipheth: use static NDP16 location in URB |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| usbnet: ipheth: use static NDP16 location in URB |
| |
| Original code allowed for the start of NDP16 to be anywhere within the |
| URB based on the `wNdpIndex` value in NTH16. Only the start position of |
| NDP16 was checked, so it was possible for even the fixed-length part |
| of NDP16 to extend past the end of URB, leading to an out-of-bounds |
| read. |
| |
| On iOS devices, the NDP16 header always directly follows NTH16. Rely on |
| and check for this specific format. |
| |
| This, along with NCM-specific minimal URB length check that already |
| exists, will ensure that the fixed-length part of NDP16 plus a set |
| amount of DPEs fit within the URB. |
| |
| Note that this commit alone does not fully address the OoB read. |
| The limit on the amount of DPEs needs to be enforced separately. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21742 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.5 with commit a2d274c62e44b1995c170595db3865c6fe701226 and fixed in 6.6.78 with commit 8fb062178e1ce180e2cfdc9abc83a1b9fea381ca |
| Issue introduced in 6.5 with commit a2d274c62e44b1995c170595db3865c6fe701226 and fixed in 6.12.14 with commit cf1ac7f7cf601ac31d1580559c002b5e37b733b7 |
| Issue introduced in 6.5 with commit a2d274c62e44b1995c170595db3865c6fe701226 and fixed in 6.13.3 with commit 2b619445dcb6dab97d8ed033fb57225aca1288c4 |
| Issue introduced in 6.5 with commit a2d274c62e44b1995c170595db3865c6fe701226 and fixed in 6.14 with commit 86586dcb75cb8fd062a518aca8ee667938b91efb |
| |
| 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-2025-21742 |
| 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/net/usb/ipheth.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/8fb062178e1ce180e2cfdc9abc83a1b9fea381ca |
| https://git.kernel.org/stable/c/cf1ac7f7cf601ac31d1580559c002b5e37b733b7 |
| https://git.kernel.org/stable/c/2b619445dcb6dab97d8ed033fb57225aca1288c4 |
| https://git.kernel.org/stable/c/86586dcb75cb8fd062a518aca8ee667938b91efb |
