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Message-ID: <2025123021-CVE-2022-50846-caa2@gregkh> Date: Tue, 30 Dec 2025 13:13:32 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2022-50846: mmc: via-sdmmc: fix return value check of mmc_add_host() From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: mmc: via-sdmmc: fix return value check of mmc_add_host() mmc_add_host() may return error, if we ignore its return value, it will lead two issues: 1. The memory that allocated in mmc_alloc_host() is leaked. 2. In the remove() path, mmc_remove_host() will be called to delete device, but it's not added yet, it will lead a kernel crash because of null-ptr-deref in device_del(). Fix this by checking the return value and goto error path which will call mmc_free_host(). The Linux kernel CVE team has assigned CVE-2022-50846 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.31 with commit f0bf7f61b8405224bc52fc9a3ccd167a68126e00 and fixed in 4.9.337 with commit 076bcd2c93e16b05c10564e299d6e5d26a766d00 Issue introduced in 2.6.31 with commit f0bf7f61b8405224bc52fc9a3ccd167a68126e00 and fixed in 4.14.303 with commit 12b8e81b77c05c658efd9cde3585bbd65ae39b59 Issue introduced in 2.6.31 with commit f0bf7f61b8405224bc52fc9a3ccd167a68126e00 and fixed in 4.19.270 with commit 95025a8dd0ec015872f6c16473fe04d6264e68ca Issue introduced in 2.6.31 with commit f0bf7f61b8405224bc52fc9a3ccd167a68126e00 and fixed in 5.4.229 with commit f59ef2a47a228e51322ad76752a55a8917c56e38 Issue introduced in 2.6.31 with commit f0bf7f61b8405224bc52fc9a3ccd167a68126e00 and fixed in 5.10.163 with commit 63400da6cd37a9793c19bb6aed7131b58b975a04 Issue introduced in 2.6.31 with commit f0bf7f61b8405224bc52fc9a3ccd167a68126e00 and fixed in 5.15.86 with commit 0959cc1685eb19774300d43ef25e318b457b156b Issue introduced in 2.6.31 with commit f0bf7f61b8405224bc52fc9a3ccd167a68126e00 and fixed in 6.0.16 with commit 0ec94795114edc7e24ec71849dce42bfa61dafa3 Issue introduced in 2.6.31 with commit f0bf7f61b8405224bc52fc9a3ccd167a68126e00 and fixed in 6.1.2 with commit ba91b413983a9235792523c6b9f7ba2586c4d75d Issue introduced in 2.6.31 with commit f0bf7f61b8405224bc52fc9a3ccd167a68126e00 and fixed in 6.2 with commit e4e46fb61e3bb4628170810d3f2b996b709b90d9 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-2022-50846 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/host/via-sdmmc.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/076bcd2c93e16b05c10564e299d6e5d26a766d00 https://git.kernel.org/stable/c/12b8e81b77c05c658efd9cde3585bbd65ae39b59 https://git.kernel.org/stable/c/95025a8dd0ec015872f6c16473fe04d6264e68ca https://git.kernel.org/stable/c/f59ef2a47a228e51322ad76752a55a8917c56e38 https://git.kernel.org/stable/c/63400da6cd37a9793c19bb6aed7131b58b975a04 https://git.kernel.org/stable/c/0959cc1685eb19774300d43ef25e318b457b156b https://git.kernel.org/stable/c/0ec94795114edc7e24ec71849dce42bfa61dafa3 https://git.kernel.org/stable/c/ba91b413983a9235792523c6b9f7ba2586c4d75d https://git.kernel.org/stable/c/e4e46fb61e3bb4628170810d3f2b996b709b90d9
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