{"id":"CVE-2022-49755","summary":"usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait\n\nWhile performing fast composition switch, there is a possibility that the\nprocess of ffs_ep0_write/ffs_ep0_read get into a race condition\ndue to ep0req being freed up from functionfs_unbind.\n\nConsider the scenario that the ffs_ep0_write calls the ffs_ep0_queue_wait\nby taking a lock &ffs-\u003eev.waitq.lock. However, the functionfs_unbind isn't\nbounded so it can go ahead and mark the ep0req to NULL, and since there\nis no NULL check in ffs_ep0_queue_wait we will end up in use-after-free.\n\nFix this by making a serialized execution between the two functions using\na mutex_lock(ffs-\u003emutex).","modified":"2026-05-18T05:56:58.829265829Z","published":"2025-03-27T16:43:02.950Z","related":["SUSE-SU-2025:1176-1","SUSE-SU-2025:1183-1","SUSE-SU-2025:1195-1","SUSE-SU-2025:1241-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49755.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/6a19da111057f69214b97c62fb0ac59023970850"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6aee197b7fbcd61596a78b47d553f2f99111f217"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6dd9ea05534f323668db94fcc2726c7a84547e78"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a8d40942df074f4ebcb9bd3413596d92f323b064"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ae8e136bcaae96163b5821984de1036efc9abb1a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/facf353c9e8d7885b686d9a4b173d4e0af6441d2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49755.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49755"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ddf8abd2599491cbad959c700b90ba72a5dce8d0"},{"fixed":"facf353c9e8d7885b686d9a4b173d4e0af6441d2"},{"fixed":"e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4"},{"fixed":"a8d40942df074f4ebcb9bd3413596d92f323b064"},{"fixed":"6dd9ea05534f323668db94fcc2726c7a84547e78"},{"fixed":"ae8e136bcaae96163b5821984de1036efc9abb1a"},{"fixed":"6aee197b7fbcd61596a78b47d553f2f99111f217"},{"fixed":"6a19da111057f69214b97c62fb0ac59023970850"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49755.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.35"},{"fixed":"4.14.305"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.272"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.231"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.166"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.91"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49755.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}