| 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-2024-39293: Revert "xsk: Support redirect to any socket bound to the same umem" |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| Revert "xsk: Support redirect to any socket bound to the same umem" |
| |
| This reverts commit 2863d665ea41282379f108e4da6c8a2366ba66db. |
| |
| This patch introduced a potential kernel crash when multiple napi instances |
| redirect to the same AF_XDP socket. By removing the queue_index check, it is |
| possible for multiple napi instances to access the Rx ring at the same time, |
| which will result in a corrupted ring state which can lead to a crash when |
| flushing the rings in __xsk_flush(). This can happen when the linked list of |
| sockets to flush gets corrupted by concurrent accesses. A quick and small fix |
| is not possible, so let us revert this for now. |
| |
| The Linux kernel CVE team has assigned CVE-2024-39293 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.9 with commit 2863d665ea41282379f108e4da6c8a2366ba66db and fixed in 6.9.5 with commit 19cb40b1064566ea09538289bfcf5bc7ecb9b6f5 |
| Issue introduced in 6.9 with commit 2863d665ea41282379f108e4da6c8a2366ba66db and fixed in 6.10 with commit 7fcf26b315bbb728036da0862de6b335da83dff2 |
| |
| 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-2024-39293 |
| 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: |
| net/xdp/xsk.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/19cb40b1064566ea09538289bfcf5bc7ecb9b6f5 |
| https://git.kernel.org/stable/c/7fcf26b315bbb728036da0862de6b335da83dff2 |
