| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-48735: ALSA: hda: Fix UAF of leds class devs at unbinding |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ALSA: hda: Fix UAF of leds class devs at unbinding |
| |
| The LED class devices that are created by HD-audio codec drivers are |
| registered via devm_led_classdev_register() and associated with the |
| HD-audio codec device. Unfortunately, it turned out that the devres |
| release doesn't work for this case; namely, since the codec resource |
| release happens before the devm call chain, it triggers a NULL |
| dereference or a UAF for a stale set_brightness_delay callback. |
| |
| For fixing the bug, this patch changes the LED class device register |
| and unregister in a manual manner without devres, keeping the |
| instances in hda_gen_spec. |
| |
| The Linux kernel CVE team has assigned CVE-2022-48735 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.9 with commit 15509b6344726de22bdbfff88b65341dd0dd33af and fixed in 5.10.99 with commit a7de1002135cf94367748ffc695a29812d7633b5 |
| Issue introduced in 5.9 with commit 15509b6344726de22bdbfff88b65341dd0dd33af and fixed in 5.15.22 with commit 0e629052f013eeb61494d4df2f1f647c2a9aef47 |
| Issue introduced in 5.9 with commit 15509b6344726de22bdbfff88b65341dd0dd33af and fixed in 5.16.8 with commit 813e9f3e06d22e29872d4fd51b54992d89cf66c8 |
| Issue introduced in 5.9 with commit 15509b6344726de22bdbfff88b65341dd0dd33af and fixed in 5.17 with commit 549f8ffc7b2f7561bea7f90930b6c5104318e87b |
| |
| 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-2022-48735 |
| 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_generic.c |
| sound/pci/hda/hda_generic.h |
| |
| |
| 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/a7de1002135cf94367748ffc695a29812d7633b5 |
| https://git.kernel.org/stable/c/0e629052f013eeb61494d4df2f1f647c2a9aef47 |
| https://git.kernel.org/stable/c/813e9f3e06d22e29872d4fd51b54992d89cf66c8 |
| https://git.kernel.org/stable/c/549f8ffc7b2f7561bea7f90930b6c5104318e87b |
