| 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-2023-52736: ALSA: hda: Do not unset preset when cleaning up codec |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ALSA: hda: Do not unset preset when cleaning up codec |
| |
| Several functions that take part in codec's initialization and removal |
| are re-used by ASoC codec drivers implementations. Drivers mimic the |
| behavior of hda_codec_driver_probe/remove() found in |
| sound/pci/hda/hda_bind.c with their component->probe/remove() instead. |
| |
| One of the reasons for that is the expectation of |
| snd_hda_codec_device_new() to receive a valid pointer to an instance of |
| struct snd_card. This expectation can be met only once sound card |
| components probing commences. |
| |
| As ASoC sound card may be unbound without codec device being actually |
| removed from the system, unsetting ->preset in |
| snd_hda_codec_cleanup_for_unbind() interferes with module unload -> load |
| scenario causing null-ptr-deref. Preset is assigned only once, during |
| device/driver matching whereas ASoC codec driver's module reloading may |
| occur several times throughout the lifetime of an audio stack. |
| |
| The Linux kernel CVE team has assigned CVE-2023-52736 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.169 with commit 7fc4e7191eae9d9325511e03deadfdb2224914f8 |
| Fixed in 5.15.95 with commit e909f5f2aa55a8f9aa6919cce08015cb0e8d4668 |
| Fixed in 6.1.13 with commit 427ca2530da8dc61a42620d7113b05e187b6c2c0 |
| Fixed in 6.2 with commit 87978e6ad45a16835cc58234451111091be3c59a |
| |
| 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-2023-52736 |
| 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/pci/hda/hda_bind.c |
| sound/pci/hda/hda_codec.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/7fc4e7191eae9d9325511e03deadfdb2224914f8 |
| https://git.kernel.org/stable/c/e909f5f2aa55a8f9aa6919cce08015cb0e8d4668 |
| https://git.kernel.org/stable/c/427ca2530da8dc61a42620d7113b05e187b6c2c0 |
| https://git.kernel.org/stable/c/87978e6ad45a16835cc58234451111091be3c59a |
