| 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-2021-46979: iio: core: fix ioctl handlers removal |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| iio: core: fix ioctl handlers removal |
| |
| Currently ioctl handlers are removed twice. For the first time during |
| iio_device_unregister() then later on inside |
| iio_device_unregister_eventset() and iio_buffers_free_sysfs_and_mask(). |
| Double free leads to kernel panic. |
| |
| Fix this by not touching ioctl handlers list directly but rather |
| letting code responsible for registration call the matching cleanup |
| routine itself. |
| |
| The Linux kernel CVE team has assigned CVE-2021-46979 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.11 with commit 8dedcc3eee3aceb37832176f0a1b03d5687acda3 and fixed in 5.11.22 with commit 11e1cae5da4096552f7c091476cbadbc0d1817da |
| Issue introduced in 5.11 with commit 8dedcc3eee3aceb37832176f0a1b03d5687acda3 and fixed in 5.12.5 with commit ab6c935ba3a04317632f3b8b68675bdbaf395303 |
| Issue introduced in 5.11 with commit 8dedcc3eee3aceb37832176f0a1b03d5687acda3 and fixed in 5.13 with commit 901f84de0e16bde10a72d7eb2f2eb73fcde8fa1a |
| |
| 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-2021-46979 |
| 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/industrialio-core.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/11e1cae5da4096552f7c091476cbadbc0d1817da |
| https://git.kernel.org/stable/c/ab6c935ba3a04317632f3b8b68675bdbaf395303 |
| https://git.kernel.org/stable/c/901f84de0e16bde10a72d7eb2f2eb73fcde8fa1a |
