{"id":"CVE-2026-46048","summary":"ALSA: caiaq: fix usb_dev refcount leak on probe failure","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: fix usb_dev refcount leak on probe failure\n\ncreate_card() takes a reference on the USB device with usb_get_dev()\nand stores the matching usb_put_dev() in card_free(), which is\ninstalled as the snd_card's -\u003eprivate_free destructor.\n\nHowever, -\u003eprivate_free is only assigned near the end of init_card(),\nafter several failure points (usb_set_interface(), EP type checks,\nusb_submit_urb(), the EP1_CMD_GET_DEVICE_INFO exchange, and its\ntimeout). When any of those fail, init_card() returns an error to\nsnd_probe(), which calls snd_card_free(card). Because -\u003eprivate_free\nis still NULL, card_free() never runs, the usb_get_dev() reference\nis not dropped, and the struct usb_device leaks along with its\ndescriptor allocations and device_private.\n\nsyzbot reproduces this with a malformed UAC3 device whose only valid\naltsetting is 0; init_card()'s usb_set_interface(usb_dev, 0, 1) call\nfails with -EIO and triggers the leak.\n\nMove the -\u003eprivate_free assignment into create_card(), immediately\nafter usb_get_dev(), so that every error path reaching snd_card_free()\nbalances the reference. card_free()'s callees (snd_usb_caiaq_input_free,\nfree_urbs, kfree) already tolerate the partially-initialized state\nbecause the chip private area is zero-initialized by snd_card_new().","modified":"2026-06-18T03:54:23.668654258Z","published":"2026-05-27T12:57:04.477Z","related":["openSUSE-SU-2026:10954-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46048.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/21ca595aafa40d3ac70eab1f4cb62cc00ca21657"},{"type":"WEB","url":"https://git.kernel.org/stable/c/50c6a1f05973f56d23280c9d7645a7a5734e0907"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6153878c5255bb69b7d0868105ca078ef13cbcf8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6fa8dff64fb6c401ced40a05797b327659317498"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7a5f1cd22d47f8ca4b760b6334378ae42c1bd24b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a8d907acc3e5a078c2e5637ff60c30c6d2ddc23a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c874db8a1d2f9f08161470d00cfe8db2f5cca2cc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/da3b8fd6a202d94fef11a443abc9171c52426a1c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46048.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46048"},{"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":"493b3a682ededc804555755f5d2193201339612d"},{"fixed":"c874db8a1d2f9f08161470d00cfe8db2f5cca2cc"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"dbcf7588e8dea017ddb3f18ec2766f7d2e5f2a0e"},{"fixed":"6fa8dff64fb6c401ced40a05797b327659317498"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ac7345f68cda6989016d85d63f7b244c064aa8f6"},{"fixed":"a8d907acc3e5a078c2e5637ff60c30c6d2ddc23a"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f6634af5de728a46792f674a66d7843570cb68f7"},{"fixed":"50c6a1f05973f56d23280c9d7645a7a5734e0907"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1d9be95aee6c6246a21752e60c9519902649f482"},{"fixed":"da3b8fd6a202d94fef11a443abc9171c52426a1c"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6473ed16df1fe88051140611b3eb9a49be7f429e"},{"fixed":"6153878c5255bb69b7d0868105ca078ef13cbcf8"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"59b622a043cffc58b7638cd85ae6c30a0904f8e6"},{"fixed":"21ca595aafa40d3ac70eab1f4cb62cc00ca21657"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"80bb50e2d459213cccff3111d5ef98ed4238c0d5"},{"fixed":"7a5f1cd22d47f8ca4b760b6334378ae42c1bd24b"}]}],"versions":["v6.6.139","v6.6.138","v6.6.137","v6.6.136","v6.12.85","v6.12.84","v6.18.26","v6.18.25","v7.0.3","v7.0.2"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46048.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.6.136"},{"fixed":"6.6.140"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.12.84"},{"fixed":"6.12.86"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.18.25"},{"fixed":"6.18.27"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.0.2"},{"fixed":"7.0.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46048.json"}}],"schema_version":"1.7.5"}