| 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-2021-47071: uio_hv_generic: Fix a memory leak in error handling paths |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| uio_hv_generic: Fix a memory leak in error handling paths |
| |
| If 'vmbus_establish_gpadl()' fails, the (recv|send)_gpadl will not be |
| updated and 'hv_uio_cleanup()' in the error handling path will not be |
| able to free the corresponding buffer. |
| |
| In such a case, we need to free the buffer explicitly. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47071 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.20 with commit cdfa835c6e5e87d145f9f632b58843de97509f2b and fixed in 5.4.122 with commit cdd91637d4ef33e2be19a8e16e72e7d00c996d76 |
| Issue introduced in 4.20 with commit cdfa835c6e5e87d145f9f632b58843de97509f2b and fixed in 5.10.40 with commit d84b5e912212b05f6b5bde9f682046accfbe0354 |
| Issue introduced in 4.20 with commit cdfa835c6e5e87d145f9f632b58843de97509f2b and fixed in 5.12.7 with commit 53486c467e356e06aa37047c984fccd64d78c827 |
| Issue introduced in 4.20 with commit cdfa835c6e5e87d145f9f632b58843de97509f2b and fixed in 5.13 with commit 3ee098f96b8b6c1a98f7f97915f8873164e6af9d |
| |
| 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-2021-47071 |
| 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/uio/uio_hv_generic.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/cdd91637d4ef33e2be19a8e16e72e7d00c996d76 |
| https://git.kernel.org/stable/c/d84b5e912212b05f6b5bde9f682046accfbe0354 |
| https://git.kernel.org/stable/c/53486c467e356e06aa37047c984fccd64d78c827 |
| https://git.kernel.org/stable/c/3ee098f96b8b6c1a98f7f97915f8873164e6af9d |
