| 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-2025-21661: gpio: virtuser: fix missing lookup table cleanups |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| gpio: virtuser: fix missing lookup table cleanups |
| |
| When a virtuser device is created via configfs and the probe fails due |
| to an incorrect lookup table, the table is not removed. This prevents |
| subsequent probe attempts from succeeding, even if the issue is |
| corrected, unless the device is released. Additionally, cleanup is also |
| needed in the less likely case of platform_device_register_full() |
| failure. |
| |
| Besides, a consistent memory leak in lookup_table->dev_id was spotted |
| using kmemleak by toggling the live state between 0 and 1 with a correct |
| lookup table. |
| |
| Introduce gpio_virtuser_remove_lookup_table() as the counterpart to the |
| existing gpio_virtuser_make_lookup_table() and call it from all |
| necessary points to ensure proper cleanup. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21661 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.11 with commit 91581c4b3f29e2e22aeb1a62e842d529ca638b2d and fixed in 6.12.10 with commit d72d0126b1f6981f6ce8b4247305f359958c11b5 |
| Issue introduced in 6.11 with commit 91581c4b3f29e2e22aeb1a62e842d529ca638b2d and fixed in 6.13 with commit a619cba8c69c434258ff4101d463322cd63e1bdc |
| |
| 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-2025-21661 |
| 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/gpio/gpio-virtuser.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/d72d0126b1f6981f6ce8b4247305f359958c11b5 |
| https://git.kernel.org/stable/c/a619cba8c69c434258ff4101d463322cd63e1bdc |
