| 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-2021-47511: ALSA: pcm: oss: Fix negative period/buffer sizes |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ALSA: pcm: oss: Fix negative period/buffer sizes |
| |
| The period size calculation in OSS layer may receive a negative value |
| as an error, but the code there assumes only the positive values and |
| handle them with size_t. Due to that, a too big value may be passed |
| to the lower layers. |
| |
| This patch changes the code to handle with ssize_t and adds the proper |
| error checks appropriately. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47511 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.4.295 with commit be8869d388593e57223ad39297c8e54be632f2f2 |
| Fixed in 4.9.293 with commit 502e1146873d870f87da3b8f93d6bf2de5f38d0c |
| Fixed in 4.14.258 with commit 8af815ab052eaf74addbbfb556d63ce2137c0e1b |
| Fixed in 4.19.221 with commit f96c0959c1ee92adc911c10d6ec209af50105049 |
| Fixed in 5.4.165 with commit f12c8a7515f641885677960af450082569a87243 |
| Fixed in 5.10.85 with commit 02b2b691b77cd7b951fa7b6c9d44d4e472cdc823 |
| Fixed in 5.15.8 with commit 00a860678098fcd9fa8db2b5fb9d2ddf4776d4cc |
| Fixed in 5.16 with commit 9d2479c960875ca1239bcb899f386970c13d9cfe |
| |
| 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-2021-47511 |
| 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: |
| sound/core/oss/pcm_oss.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/be8869d388593e57223ad39297c8e54be632f2f2 |
| https://git.kernel.org/stable/c/502e1146873d870f87da3b8f93d6bf2de5f38d0c |
| https://git.kernel.org/stable/c/8af815ab052eaf74addbbfb556d63ce2137c0e1b |
| https://git.kernel.org/stable/c/f96c0959c1ee92adc911c10d6ec209af50105049 |
| https://git.kernel.org/stable/c/f12c8a7515f641885677960af450082569a87243 |
| https://git.kernel.org/stable/c/02b2b691b77cd7b951fa7b6c9d44d4e472cdc823 |
| https://git.kernel.org/stable/c/00a860678098fcd9fa8db2b5fb9d2ddf4776d4cc |
| https://git.kernel.org/stable/c/9d2479c960875ca1239bcb899f386970c13d9cfe |
