| 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-2021-47605: vduse: fix memory corruption in vduse_dev_ioctl() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| vduse: fix memory corruption in vduse_dev_ioctl() |
| |
| The "config.offset" comes from the user. There needs to a check to |
| prevent it being out of bounds. The "config.offset" and |
| "dev->config_size" variables are both type u32. So if the offset if |
| out of bounds then the "dev->config_size - config.offset" subtraction |
| results in a very high u32 value. The out of bounds offset can result |
| in memory corruption. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47605 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit c8a6153b6c59d95c0e091f053f6f180952ade91e and fixed in 5.15.11 with commit e6c67560b4341914bec32ec536e931c22062af65 |
| Issue introduced in 5.15 with commit c8a6153b6c59d95c0e091f053f6f180952ade91e and fixed in 5.16 with commit ff9f9c6e74848170fcb45c8403c80d661484c8c9 |
| |
| 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-2021-47605 |
| 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/vdpa/vdpa_user/vduse_dev.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/e6c67560b4341914bec32ec536e931c22062af65 |
| https://git.kernel.org/stable/c/ff9f9c6e74848170fcb45c8403c80d661484c8c9 |
