| 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-2021-47013: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send |
| |
| In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..). |
| If some error happens in emac_tx_fill_tpd(), the skb will be freed via |
| dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd(). |
| But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len). |
| |
| As i observed that emac_tx_fill_tpd() haven't modified the value of skb->len, |
| thus my patch assigns skb->len to 'len' before the possible free and |
| use 'len' instead of skb->len later. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47013 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.9 with commit b9b17debc69d27cd55e21ee51a5ba7fc50a426cf and fixed in 4.9.269 with commit c7f75d11fe72913d2619f97b2334b083cd7bb955 |
| Issue introduced in 4.9 with commit b9b17debc69d27cd55e21ee51a5ba7fc50a426cf and fixed in 4.14.233 with commit dc1b438a35773d030be0ee80d9c635c3e558a322 |
| Issue introduced in 4.9 with commit b9b17debc69d27cd55e21ee51a5ba7fc50a426cf and fixed in 4.19.191 with commit 16d8c44be52e3650917736d45f5904384a9da834 |
| Issue introduced in 4.9 with commit b9b17debc69d27cd55e21ee51a5ba7fc50a426cf and fixed in 5.4.119 with commit 55fcdd1258faaecca74b91b88cc0921f9edd775d |
| Issue introduced in 4.9 with commit b9b17debc69d27cd55e21ee51a5ba7fc50a426cf and fixed in 5.10.37 with commit 9dc373f74097edd0e35f3393d6248eda8d1ba99d |
| Issue introduced in 4.9 with commit b9b17debc69d27cd55e21ee51a5ba7fc50a426cf and fixed in 5.11.21 with commit 8c06f34785068b87e2b560534c77c163d6c6dca7 |
| Issue introduced in 4.9 with commit b9b17debc69d27cd55e21ee51a5ba7fc50a426cf and fixed in 5.12.4 with commit e407495ba6788a67d1bd41714158c079e340879b |
| Issue introduced in 4.9 with commit b9b17debc69d27cd55e21ee51a5ba7fc50a426cf and fixed in 5.13 with commit 6d72e7c767acbbdd44ebc7d89c6690b405b32b57 |
| |
| 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-2021-47013 |
| 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/qualcomm/emac/emac-mac.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/c7f75d11fe72913d2619f97b2334b083cd7bb955 |
| https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322 |
| https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834 |
| https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d |
| https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d |
| https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7 |
| https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b |
| https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57 |
