| 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-2021-47164: net/mlx5e: Fix null deref accessing lag dev |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net/mlx5e: Fix null deref accessing lag dev |
| |
| It could be the lag dev is null so stop processing the event. |
| In bond_enslave() the active/backup slave being set before setting the |
| upper dev so first event is without an upper dev. |
| After setting the upper dev with bond_master_upper_dev_link() there is |
| a second event and in that event we have an upper dev. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47164 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.8 with commit 7e51891a237f9ea319f53f9beb83afb0077d88e6 and fixed in 5.10.42 with commit 2e4b0b95a489259f9d35a3db17023061f8f3d587 |
| Issue introduced in 5.8 with commit 7e51891a237f9ea319f53f9beb83afb0077d88e6 and fixed in 5.12.9 with commit bdfd3593a8248eea6ecfcbf7b47b56b86515672d |
| Issue introduced in 5.8 with commit 7e51891a237f9ea319f53f9beb83afb0077d88e6 and fixed in 5.13 with commit 83026d83186bc48bb41ee4872f339b83f31dfc55 |
| |
| 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-2021-47164 |
| 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/mlx5/core/en/rep/bond.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/2e4b0b95a489259f9d35a3db17023061f8f3d587 |
| https://git.kernel.org/stable/c/bdfd3593a8248eea6ecfcbf7b47b56b86515672d |
| https://git.kernel.org/stable/c/83026d83186bc48bb41ee4872f339b83f31dfc55 |
