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Message-ID: <2025120935-CVE-2022-50640-324c@gregkh> Date: Tue, 9 Dec 2025 09:01:41 +0900 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2022-50640: mmc: core: Fix kernel panic when remove non-standard SDIO card From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: mmc: core: Fix kernel panic when remove non-standard SDIO card SDIO tuple is only allocated for standard SDIO card, especially it causes memory corruption issues when the non-standard SDIO card has removed, which is because the card device's reference counter does not increase for it at sdio_init_func(), but all SDIO card device reference counter gets decreased at sdio_release_func(). The Linux kernel CVE team has assigned CVE-2022-50640 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.36 with commit 6f51be3d37dff73cf8db771df4169f4c2f1cbf66 and fixed in 4.9.332 with commit b8b2965932e702b21e335ff30e1bb550f5a23b6f Issue introduced in 2.6.36 with commit 6f51be3d37dff73cf8db771df4169f4c2f1cbf66 and fixed in 4.14.298 with commit b3275dde570b6420106a715bb58a0af041b94d95 Issue introduced in 2.6.36 with commit 6f51be3d37dff73cf8db771df4169f4c2f1cbf66 and fixed in 4.19.264 with commit 1fb79478695d92bab1c120ad3dad05252b02a29d Issue introduced in 2.6.36 with commit 6f51be3d37dff73cf8db771df4169f4c2f1cbf66 and fixed in 5.4.223 with commit 7a09c64b7da0abdec3919812e3d93ecc44069ed0 Issue introduced in 2.6.36 with commit 6f51be3d37dff73cf8db771df4169f4c2f1cbf66 and fixed in 5.10.153 with commit 8bf037279b5869ae9331c42bb1527d2680ebba96 Issue introduced in 2.6.36 with commit 6f51be3d37dff73cf8db771df4169f4c2f1cbf66 and fixed in 5.15.77 with commit 1e8cd93ae536581562bab4e1d8c5315bbc2548bf Issue introduced in 2.6.36 with commit 6f51be3d37dff73cf8db771df4169f4c2f1cbf66 and fixed in 6.0.7 with commit 66d461a92f32b6995b630625d350259b6b1f961b Issue introduced in 2.6.36 with commit 6f51be3d37dff73cf8db771df4169f4c2f1cbf66 and fixed in 6.1 with commit 9972e6b404884adae9eec7463e30d9b3c9a70b18 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-2022-50640 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/mmc/core/sdio_bus.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/b8b2965932e702b21e335ff30e1bb550f5a23b6f https://git.kernel.org/stable/c/b3275dde570b6420106a715bb58a0af041b94d95 https://git.kernel.org/stable/c/1fb79478695d92bab1c120ad3dad05252b02a29d https://git.kernel.org/stable/c/7a09c64b7da0abdec3919812e3d93ecc44069ed0 https://git.kernel.org/stable/c/8bf037279b5869ae9331c42bb1527d2680ebba96 https://git.kernel.org/stable/c/1e8cd93ae536581562bab4e1d8c5315bbc2548bf https://git.kernel.org/stable/c/66d461a92f32b6995b630625d350259b6b1f961b https://git.kernel.org/stable/c/9972e6b404884adae9eec7463e30d9b3c9a70b18
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