| 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-2021-46916: ixgbe: Fix NULL pointer dereference in ethtool loopback test |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ixgbe: Fix NULL pointer dereference in ethtool loopback test |
| |
| The ixgbe driver currently generates a NULL pointer dereference when |
| performing the ethtool loopback test. This is due to the fact that there |
| isn't a q_vector associated with the test ring when it is setup as |
| interrupts are not normally added to the test rings. |
| |
| To address this I have added code that will check for a q_vector before |
| returning a napi_id value. If a q_vector is not present it will return a |
| value of 0. |
| |
| The Linux kernel CVE team has assigned CVE-2021-46916 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.11 with commit b02e5a0ebb172c8276cea3151942aac681f7a4a6 and fixed in 5.11.16 with commit 758d19098df4b0bbca9f40d6ae6c82c9c18b9bba |
| Issue introduced in 5.11 with commit b02e5a0ebb172c8276cea3151942aac681f7a4a6 and fixed in 5.12 with commit 31166efb1cee348eb6314e9c0095d84cbeb66b9d |
| |
| 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-2021-46916 |
| 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/intel/ixgbe/ixgbe_main.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/758d19098df4b0bbca9f40d6ae6c82c9c18b9bba |
| https://git.kernel.org/stable/c/31166efb1cee348eb6314e9c0095d84cbeb66b9d |
