| 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-2024-41091: tun: add missing verification for short frame |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| tun: add missing verification for short frame |
| |
| The cited commit missed to check against the validity of the frame length |
| in the tun_xdp_one() path, which could cause a corrupted skb to be sent |
| downstack. Even before the skb is transmitted, the |
| tun_xdp_one-->eth_type_trans() may access the Ethernet header although it |
| can be less than ETH_HLEN. Once transmitted, this could either cause |
| out-of-bound access beyond the actual length, or confuse the underlayer |
| with incorrect or inconsistent header length in the skb metadata. |
| |
| In the alternative path, tun_get_user() already prohibits short frame which |
| has the length less than Ethernet header size from being transmitted for |
| IFF_TAP. |
| |
| This is to drop any frame shorter than the Ethernet header size just like |
| how tun_get_user() does. |
| |
| CVE: CVE-2024-41091 |
| |
| The Linux kernel CVE team has assigned CVE-2024-41091 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.20 with commit 043d222f93ab8c76b56a3b315cd8692e35affb6c and fixed in 5.4.281 with commit 32b0aaba5dbc85816898167d9b5d45a22eae82e9 |
| Issue introduced in 4.20 with commit 043d222f93ab8c76b56a3b315cd8692e35affb6c and fixed in 5.10.223 with commit 6100e0237204890269e3f934acfc50d35fd6f319 |
| Issue introduced in 4.20 with commit 043d222f93ab8c76b56a3b315cd8692e35affb6c and fixed in 5.15.164 with commit 589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2 |
| Issue introduced in 4.20 with commit 043d222f93ab8c76b56a3b315cd8692e35affb6c and fixed in 6.1.102 with commit ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146 |
| Issue introduced in 4.20 with commit 043d222f93ab8c76b56a3b315cd8692e35affb6c and fixed in 6.6.43 with commit d5ad89b7d01ed4e66fd04734fc63d6e78536692a |
| Issue introduced in 4.20 with commit 043d222f93ab8c76b56a3b315cd8692e35affb6c and fixed in 6.9.12 with commit a9d1c27e2ee3b0ea5d40c105d6e728fc114470bb |
| Issue introduced in 4.20 with commit 043d222f93ab8c76b56a3b315cd8692e35affb6c and fixed in 6.10.2 with commit 8418f55302fa1d2eeb73e16e345167e545c598a5 |
| Issue introduced in 4.20 with commit 043d222f93ab8c76b56a3b315cd8692e35affb6c and fixed in 6.11 with commit 049584807f1d797fc3078b68035450a9769eb5c3 |
| |
| 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-2024-41091 |
| 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/tun.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/32b0aaba5dbc85816898167d9b5d45a22eae82e9 |
| https://git.kernel.org/stable/c/6100e0237204890269e3f934acfc50d35fd6f319 |
| https://git.kernel.org/stable/c/589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2 |
| https://git.kernel.org/stable/c/ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146 |
| https://git.kernel.org/stable/c/d5ad89b7d01ed4e66fd04734fc63d6e78536692a |
| https://git.kernel.org/stable/c/a9d1c27e2ee3b0ea5d40c105d6e728fc114470bb |
| https://git.kernel.org/stable/c/8418f55302fa1d2eeb73e16e345167e545c598a5 |
| https://git.kernel.org/stable/c/049584807f1d797fc3078b68035450a9769eb5c3 |
