| 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-2021-47367: virtio-net: fix pages leaking when building skb in big mode |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| virtio-net: fix pages leaking when building skb in big mode |
| |
| We try to use build_skb() if we had sufficient tailroom. But we forget |
| to release the unused pages chained via private in big mode which will |
| leak pages. Fixing this by release the pages after building the skb in |
| big mode. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47367 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.13 with commit fb32856b16ad9d5bcd75b76a274e2c515ac7b9d7 and fixed in 5.14.9 with commit f020bb63b5d2e5576acadd10e158fe3b04af67ba |
| Issue introduced in 5.13 with commit fb32856b16ad9d5bcd75b76a274e2c515ac7b9d7 and fixed in 5.15 with commit afd92d82c9d715fb97565408755acad81573591a |
| |
| 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-2021-47367 |
| 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/virtio_net.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/f020bb63b5d2e5576acadd10e158fe3b04af67ba |
| https://git.kernel.org/stable/c/afd92d82c9d715fb97565408755acad81573591a |
