{"id":"CVE-2026-46048","state":"PUBLISHED","title":"ALSA: caiaq: fix usb_dev refcount leak on probe failure","description":"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 ->private_free destructor.\n\nHowever, ->private_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 ->private_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 ->private_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().","publishedAt":"2026-05-27T12:57:04.477Z","updatedAt":"2026-06-14T17:50:34.000Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"493b3a682ededc804555755f5d2193201339612d","status":"affected","lessThan":"c874db8a1d2f9f08161470d00cfe8db2f5cca2cc","versionType":"git"},{"version":"dbcf7588e8dea017ddb3f18ec2766f7d2e5f2a0e","status":"affected","lessThan":"6fa8dff64fb6c401ced40a05797b327659317498","versionType":"git"},{"version":"ac7345f68cda6989016d85d63f7b244c064aa8f6","status":"affected","lessThan":"a8d907acc3e5a078c2e5637ff60c30c6d2ddc23a","versionType":"git"},{"version":"f6634af5de728a46792f674a66d7843570cb68f7","status":"affected","lessThan":"50c6a1f05973f56d23280c9d7645a7a5734e0907","versionType":"git"},{"version":"1d9be95aee6c6246a21752e60c9519902649f482","status":"affected","lessThan":"da3b8fd6a202d94fef11a443abc9171c52426a1c","versionType":"git"},{"version":"6473ed16df1fe88051140611b3eb9a49be7f429e","status":"affected","lessThan":"6153878c5255bb69b7d0868105ca078ef13cbcf8","versionType":"git"},{"version":"59b622a043cffc58b7638cd85ae6c30a0904f8e6","status":"affected","lessThan":"21ca595aafa40d3ac70eab1f4cb62cc00ca21657","versionType":"git"},{"version":"80bb50e2d459213cccff3111d5ef98ed4238c0d5","status":"affected","lessThan":"7a5f1cd22d47f8ca4b760b6334378ae42c1bd24b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/caiaq/device.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6.6.136","status":"affected","lessThan":"6.6.140","versionType":"semver"},{"version":"6.12.84","status":"affected","lessThan":"6.12.86","versionType":"semver"},{"version":"6.18.25","status":"affected","lessThan":"6.18.27","versionType":"semver"},{"version":"7.0.2","status":"affected","lessThan":"7.0.4","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/caiaq/device.c"]}],"references":["https://git.kernel.org/stable/c/c874db8a1d2f9f08161470d00cfe8db2f5cca2cc","https://git.kernel.org/stable/c/6fa8dff64fb6c401ced40a05797b327659317498","https://git.kernel.org/stable/c/a8d907acc3e5a078c2e5637ff60c30c6d2ddc23a","https://git.kernel.org/stable/c/50c6a1f05973f56d23280c9d7645a7a5734e0907","https://git.kernel.org/stable/c/da3b8fd6a202d94fef11a443abc9171c52426a1c","https://git.kernel.org/stable/c/6153878c5255bb69b7d0868105ca078ef13cbcf8","https://git.kernel.org/stable/c/21ca595aafa40d3ac70eab1f4cb62cc00ca21657","https://git.kernel.org/stable/c/7a5f1cd22d47f8ca4b760b6334378ae42c1bd24b"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46048.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46048","state":"PUBLISHED","datePublished":"2026-05-27T12:57:04.477Z","dateUpdated":"2026-06-14T17:50:34.000Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.094Z"},"containers":{"cna":{"title":"ALSA: caiaq: fix usb_dev refcount leak on probe failure","descriptions":[{"lang":"en","value":"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 ->private_free destructor.\n\nHowever, ->private_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 ->private_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 ->private_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()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"493b3a682ededc804555755f5d2193201339612d","status":"affected","lessThan":"c874db8a1d2f9f08161470d00cfe8db2f5cca2cc","versionType":"git"},{"version":"dbcf7588e8dea017ddb3f18ec2766f7d2e5f2a0e","status":"affected","lessThan":"6fa8dff64fb6c401ced40a05797b327659317498","versionType":"git"},{"version":"ac7345f68cda6989016d85d63f7b244c064aa8f6","status":"affected","lessThan":"a8d907acc3e5a078c2e5637ff60c30c6d2ddc23a","versionType":"git"},{"version":"f6634af5de728a46792f674a66d7843570cb68f7","status":"affected","lessThan":"50c6a1f05973f56d23280c9d7645a7a5734e0907","versionType":"git"},{"version":"1d9be95aee6c6246a21752e60c9519902649f482","status":"affected","lessThan":"da3b8fd6a202d94fef11a443abc9171c52426a1c","versionType":"git"},{"version":"6473ed16df1fe88051140611b3eb9a49be7f429e","status":"affected","lessThan":"6153878c5255bb69b7d0868105ca078ef13cbcf8","versionType":"git"},{"version":"59b622a043cffc58b7638cd85ae6c30a0904f8e6","status":"affected","lessThan":"21ca595aafa40d3ac70eab1f4cb62cc00ca21657","versionType":"git"},{"version":"80bb50e2d459213cccff3111d5ef98ed4238c0d5","status":"affected","lessThan":"7a5f1cd22d47f8ca4b760b6334378ae42c1bd24b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/caiaq/device.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6.6.136","status":"affected","lessThan":"6.6.140","versionType":"semver"},{"version":"6.12.84","status":"affected","lessThan":"6.12.86","versionType":"semver"},{"version":"6.18.25","status":"affected","lessThan":"6.18.27","versionType":"semver"},{"version":"7.0.2","status":"affected","lessThan":"7.0.4","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/caiaq/device.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/c874db8a1d2f9f08161470d00cfe8db2f5cca2cc"},{"url":"https://git.kernel.org/stable/c/6fa8dff64fb6c401ced40a05797b327659317498"},{"url":"https://git.kernel.org/stable/c/a8d907acc3e5a078c2e5637ff60c30c6d2ddc23a"},{"url":"https://git.kernel.org/stable/c/50c6a1f05973f56d23280c9d7645a7a5734e0907"},{"url":"https://git.kernel.org/stable/c/da3b8fd6a202d94fef11a443abc9171c52426a1c"},{"url":"https://git.kernel.org/stable/c/6153878c5255bb69b7d0868105ca078ef13cbcf8"},{"url":"https://git.kernel.org/stable/c/21ca595aafa40d3ac70eab1f4cb62cc00ca21657"},{"url":"https://git.kernel.org/stable/c/7a5f1cd22d47f8ca4b760b6334378ae42c1bd24b"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-14T17:50:34.000Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.136","versionEndExcluding":"6.6.140"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.84","versionEndExcluding":"6.12.86"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.25","versionEndExcluding":"6.18.27"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0.2","versionEndExcluding":"7.0.4"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}