| 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-2021-47500: iio: mma8452: Fix trigger reference couting |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| iio: mma8452: Fix trigger reference couting |
| |
| The mma8452 driver directly assigns a trigger to the struct iio_dev. The |
| IIO core when done using this trigger will call `iio_trigger_put()` to drop |
| the reference count by 1. |
| |
| Without the matching `iio_trigger_get()` in the driver the reference count |
| can reach 0 too early, the trigger gets freed while still in use and a |
| use-after-free occurs. |
| |
| Fix this by getting a reference to the trigger before assigning it to the |
| IIO device. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47500 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.2 with commit ae6d9ce05691bf79694074db7c7da980080548af and fixed in 4.4.295 with commit 094d513b78b1714113bc016684b8142382e071ba |
| Issue introduced in 4.2 with commit ae6d9ce05691bf79694074db7c7da980080548af and fixed in 4.9.293 with commit fb75cc4740d81264cd5bcb0e17d961d018a8be96 |
| Issue introduced in 4.2 with commit ae6d9ce05691bf79694074db7c7da980080548af and fixed in 4.14.258 with commit 794c0898f6bf39a458655d5fb4af70ec43a5cfcb |
| Issue introduced in 4.2 with commit ae6d9ce05691bf79694074db7c7da980080548af and fixed in 4.19.221 with commit f5deab10ced368c807866283f8b79144c4823be8 |
| Issue introduced in 4.2 with commit ae6d9ce05691bf79694074db7c7da980080548af and fixed in 5.4.165 with commit acf0088ac073ca6e7f4cad6acac112177e08df5e |
| Issue introduced in 4.2 with commit ae6d9ce05691bf79694074db7c7da980080548af and fixed in 5.10.85 with commit db12d95085367de8b0223929d1332731024441f1 |
| Issue introduced in 4.2 with commit ae6d9ce05691bf79694074db7c7da980080548af and fixed in 5.15.8 with commit c43517071dfc9fce34f8f69dbb98a86017f6b739 |
| Issue introduced in 4.2 with commit ae6d9ce05691bf79694074db7c7da980080548af and fixed in 5.16 with commit cd0082235783f814241a1c9483fb89e405f4f892 |
| |
| 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-2021-47500 |
| 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/iio/accel/mma8452.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/094d513b78b1714113bc016684b8142382e071ba |
| https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96 |
| https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb |
| https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8 |
| https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e |
| https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1 |
| https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739 |
| https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892 |
