| 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-2021-47235: net: ethernet: fix potential use-after-free in ec_bhf_remove |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: ethernet: fix potential use-after-free in ec_bhf_remove |
| |
| static void ec_bhf_remove(struct pci_dev *dev) |
| { |
| ... |
| struct ec_bhf_priv *priv = netdev_priv(net_dev); |
| |
| unregister_netdev(net_dev); |
| free_netdev(net_dev); |
| |
| pci_iounmap(dev, priv->dma_io); |
| pci_iounmap(dev, priv->io); |
| ... |
| } |
| |
| priv is netdev private data, but it is used |
| after free_netdev(). It can cause use-after-free when accessing priv |
| pointer. So, fix it by moving free_netdev() after pci_iounmap() |
| calls. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47235 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 3.15 with commit 6af55ff52b02d492d45db88df3e461fa51a6f753 and fixed in 4.4.274 with commit db2bc3cfd2bc01621014d4f17cdfc74611f339c8 |
| Issue introduced in 3.15 with commit 6af55ff52b02d492d45db88df3e461fa51a6f753 and fixed in 4.9.274 with commit 1cafc540b7bf1b6a5a77dc000205fe337ef6eba6 |
| Issue introduced in 3.15 with commit 6af55ff52b02d492d45db88df3e461fa51a6f753 and fixed in 4.14.238 with commit b1ad283755095a4b9d1431aeb357d7df1a33d3bb |
| Issue introduced in 3.15 with commit 6af55ff52b02d492d45db88df3e461fa51a6f753 and fixed in 4.19.196 with commit 0260916843cc74f3906acf8b6f256693e01530a2 |
| Issue introduced in 3.15 with commit 6af55ff52b02d492d45db88df3e461fa51a6f753 and fixed in 5.4.128 with commit 19f88ca68ccf8771276a606765239b167654f84a |
| Issue introduced in 3.15 with commit 6af55ff52b02d492d45db88df3e461fa51a6f753 and fixed in 5.10.46 with commit 95deeb29d831e2fae608439e243e7a520611e7ea |
| Issue introduced in 3.15 with commit 6af55ff52b02d492d45db88df3e461fa51a6f753 and fixed in 5.12.13 with commit d11d79e52ba080ee567cb7d7eb42a5ade60a8130 |
| Issue introduced in 3.15 with commit 6af55ff52b02d492d45db88df3e461fa51a6f753 and fixed in 5.13 with commit 9cca0c2d70149160407bda9a9446ce0c29b6e6c6 |
| |
| 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-2021-47235 |
| 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/ec_bhf.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/db2bc3cfd2bc01621014d4f17cdfc74611f339c8 |
| https://git.kernel.org/stable/c/1cafc540b7bf1b6a5a77dc000205fe337ef6eba6 |
| https://git.kernel.org/stable/c/b1ad283755095a4b9d1431aeb357d7df1a33d3bb |
| https://git.kernel.org/stable/c/0260916843cc74f3906acf8b6f256693e01530a2 |
| https://git.kernel.org/stable/c/19f88ca68ccf8771276a606765239b167654f84a |
| https://git.kernel.org/stable/c/95deeb29d831e2fae608439e243e7a520611e7ea |
| https://git.kernel.org/stable/c/d11d79e52ba080ee567cb7d7eb42a5ade60a8130 |
| https://git.kernel.org/stable/c/9cca0c2d70149160407bda9a9446ce0c29b6e6c6 |
