| 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-2022-49134: mlxsw: spectrum: Guard against invalid local ports |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mlxsw: spectrum: Guard against invalid local ports |
| |
| When processing events generated by the device's firmware, the driver |
| protects itself from events reported for non-existent local ports, but |
| not for the CPU port (local port 0), which exists, but does not have all |
| the fields as any local port. |
| |
| This can result in a NULL pointer dereference when trying access |
| 'struct mlxsw_sp_port' fields which are not initialized for CPU port. |
| |
| Commit 63b08b1f6834 ("mlxsw: spectrum: Protect driver from buggy firmware") |
| already handled such issue by bailing early when processing a PUDE event |
| reported for the CPU port. |
| |
| Generalize the approach by moving the check to a common function and |
| making use of it in all relevant places. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49134 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.17.3 with commit 4cad27ba2e5a5843a7fab5aa30de2b8e8c3db3a8 |
| Fixed in 5.18 with commit bcdfd615f83b4bd04678109bf18022d1476e4bbf |
| |
| 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-2022-49134 |
| 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 |
| drivers/net/ethernet/mellanox/mlxsw/spectrum.h |
| drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c |
| drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.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/4cad27ba2e5a5843a7fab5aa30de2b8e8c3db3a8 |
| https://git.kernel.org/stable/c/bcdfd615f83b4bd04678109bf18022d1476e4bbf |
