| 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-2021-47560: mlxsw: spectrum: Protect driver from buggy firmware |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mlxsw: spectrum: Protect driver from buggy firmware |
| |
| When processing port up/down events generated by the device's firmware, |
| the driver protects itself from events reported for non-existent local |
| ports, but not the CPU port (local port 0), which exists, but lacks a |
| netdev. |
| |
| This can result in a NULL pointer dereference when calling |
| netif_carrier_{on,off}(). |
| |
| Fix this by bailing early when processing an event reported for the CPU |
| port. Problem was only observed when running on top of a buggy emulator. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47560 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.4 with commit 28b1987ef5064dd5c43538ba1168ef7b801f3cad and fixed in 5.10.83 with commit 90d0736876c50ecde1a3275636a06b9ddb1cace9 |
| Issue introduced in 5.4 with commit 28b1987ef5064dd5c43538ba1168ef7b801f3cad and fixed in 5.15.6 with commit da4d70199e5d82da664a80077508d6c18f5e76df |
| Issue introduced in 5.4 with commit 28b1987ef5064dd5c43538ba1168ef7b801f3cad and fixed in 5.16 with commit 63b08b1f6834bbb0b4f7783bf63b80c8c8e9a047 |
| |
| 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-2021-47560 |
| 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/ethernet/mellanox/mlxsw/spectrum.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/90d0736876c50ecde1a3275636a06b9ddb1cace9 |
| https://git.kernel.org/stable/c/da4d70199e5d82da664a80077508d6c18f5e76df |
| https://git.kernel.org/stable/c/63b08b1f6834bbb0b4f7783bf63b80c8c8e9a047 |
