| 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-2021-47558: net: stmmac: Disable Tx queues when reconfiguring the interface |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: stmmac: Disable Tx queues when reconfiguring the interface |
| |
| The Tx queues were not disabled in situations where the driver needed to |
| stop the interface to apply a new configuration. This could result in a |
| kernel panic when doing any of the 3 following actions: |
| * reconfiguring the number of queues (ethtool -L) |
| * reconfiguring the size of the ring buffers (ethtool -G) |
| * installing/removing an XDP program (ip l set dev ethX xdp) |
| |
| Prevent the panic by making sure netif_tx_disable is called when stopping |
| an interface. |
| |
| Without this patch, the following kernel panic can be observed when doing |
| any of the actions above: |
| |
| Unable to handle kernel paging request at virtual address ffff80001238d040 |
| [....] |
| Call trace: |
| dwmac4_set_addr+0x8/0x10 |
| dev_hard_start_xmit+0xe4/0x1ac |
| sch_direct_xmit+0xe8/0x39c |
| __dev_queue_xmit+0x3ec/0xaf0 |
| dev_queue_xmit+0x14/0x20 |
| [...] |
| [ end trace 0000000000000002 ]--- |
| |
| The Linux kernel CVE team has assigned CVE-2021-47558 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.10 with commit 0366f7e06a6bee7eace3946a6b67fb88b828bc5c and fixed in 5.15.6 with commit a92f0eebb8dc008b9e8c51c6f7b8c93b27a29a43 |
| Issue introduced in 5.10 with commit 0366f7e06a6bee7eace3946a6b67fb88b828bc5c and fixed in 5.16 with commit b270bfe697367776eca2e6759a71d700fb8d82a2 |
| |
| 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-2021-47558 |
| 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/stmicro/stmmac/stmmac_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/a92f0eebb8dc008b9e8c51c6f7b8c93b27a29a43 |
| https://git.kernel.org/stable/c/b270bfe697367776eca2e6759a71d700fb8d82a2 |
