{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90032", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.782Z", "datePublished": "2026-09-16T10:33:33.197Z", "dateUpdated": "2026-10-19T08:56:49.082Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:56:49.082Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: usbtv: keep device alive while ALSA card exists\n\nThe ALSA PCM callbacks store the driver state in pcm->private_data. An\nopen PCM file can outlive USB disconnect because usbtv_audio_free() uses\nsnd_card_free_when_closed(). The disconnect path can then drop the V4L2\ndevice reference and free struct usbtv before ALSA releases the substream,\nso a later close dereferences freed memory in snd_usbtv_pcm_close().\n\nTake a V4L2 device reference for the ALSA card and drop it from the card\nprivate_free callback. This keeps struct usbtv valid until ALSA has closed\nthe remaining files and freed the card." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The UAF is reached locally by opening the usbtv ALSA capture PCM, forcing usbtv_disconnect() via USBDEVFS_DISCONNECT or sysfs unbind on an already-bound USBTV007, then closing the PCM fd; there is no network or packet path. This matches AV:L scoring of analogous USB disconnect UAFs (CVE-2026-80971, CVE-2026-64585); physical unplug is only an extra path.\nAC:L - The attacker fully controls the sequence: open /dev/snd/pcmC*D*c so PCM callbacks pin pcm->private_data, issue USBDEVFS_DISCONNECT so snd_card_free_when_closed() returns without waiting, then close. That close deterministically hits freed struct usbtv in snd_usbtv_pcm_close(); no attacker-uncontrollable race or layout is required.\nPR:L - USBDEVFS_DISCONNECT has no capable() check, only write access to /dev/bus/usb that udev uaccess/plugdev rules grant seat users, and snd_pcm_open() has no capability gate on the capture PCM node (audio group/uaccess). An unprivileged local account suffices; init-namespace root is not required.\nUI:N - The attacker performs open, disconnect, and close on their own fds against an already-attached USBTV007 (capture kiosk, digitizer, or surveillance station). No separate victim action such as plugging a device or clicking is required during exploitation.\nS:U - The slab use-after-free of struct usbtv and the PCM close/trigger callbacks run entirely in the host kernel. This is ordinary local privilege escalation, not a VM, IOMMU, or sandbox boundary escape.\nC:H - snd_usbtv_pcm_close() and snd_usbtv_card_trigger() read fields of the kfree()'d struct usbtv (snd_stream, snd_trigger, snd_bulk_urb). Reclaiming that slab lets the attacker supply pointer-rich state those paths then read, enabling kernel disclosure as with other heap UAFs.\nI:H - Close can atomic_set snd_stream and schedule_work() on the freed usbtv.snd_trigger work_struct, and snd_pcm_drop may call trigger STOP on the same freed object. A reclaimed fake usbtv plus workqueue execution is a control-flow hijack primitive, so integrity impact is High.\nA:H - Use-after-free of struct usbtv in snd_usbtv_pcm_close() (and in usbtv_audio_urb_received if capture was running when USB core kills the URB after disconnect) oopses or panics the kernel. The attacker can repeat disconnect/close to crash on demand, so availability impact is High." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/usb/usbtv/usbtv-audio.c" ], "versions": [ { "version": "63ddf68de52efaac40a9287e44266ac30e71dd36", "lessThan": "97b5e8b22b98e287481a97a9a4cfebbb348738a5", "status": "affected", "versionType": "git" }, { "version": "63ddf68de52efaac40a9287e44266ac30e71dd36", "lessThan": "503be26ff888cb3576e55d251895d290e8146f27", "status": "affected", "versionType": "git" }, { "version": "63ddf68de52efaac40a9287e44266ac30e71dd36", "lessThan": "be0f7745f883386e5263b4e475686a81dfa87175", "status": "affected", "versionType": "git" }, { "version": "63ddf68de52efaac40a9287e44266ac30e71dd36", "lessThan": "67374e3a00814dcdd46e9feca61f69f7f2d81957", "status": "affected", "versionType": "git" }, { "version": "63ddf68de52efaac40a9287e44266ac30e71dd36", "lessThan": "239d1683e08b2aee2a15ef35706e1ea9a76681d8", "status": "affected", "versionType": "git" }, { "version": "63ddf68de52efaac40a9287e44266ac30e71dd36", "lessThan": "7690a86b193271322cd31ab77349a87aa10858e4", "status": "affected", "versionType": "git" }, { "version": "63ddf68de52efaac40a9287e44266ac30e71dd36", "lessThan": "1618257cb0aba4ce342ae8c0228368c24161f5fb", "status": "affected", "versionType": "git" }, { "version": "63ddf68de52efaac40a9287e44266ac30e71dd36", "lessThan": "fc530fe168bb2b745a93f553ad21fc25fd9cba3d", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/usb/usbtv/usbtv-audio.c" ], "versions": [ { "version": "3.18", "status": "affected" }, { "version": "0", "lessThan": "3.18", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.5", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "7.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/97b5e8b22b98e287481a97a9a4cfebbb348738a5" }, { "url": "https://git.kernel.org/stable/c/503be26ff888cb3576e55d251895d290e8146f27" }, { "url": "https://git.kernel.org/stable/c/be0f7745f883386e5263b4e475686a81dfa87175" }, { "url": "https://git.kernel.org/stable/c/67374e3a00814dcdd46e9feca61f69f7f2d81957" }, { "url": "https://git.kernel.org/stable/c/239d1683e08b2aee2a15ef35706e1ea9a76681d8" }, { "url": "https://git.kernel.org/stable/c/7690a86b193271322cd31ab77349a87aa10858e4" }, { "url": "https://git.kernel.org/stable/c/1618257cb0aba4ce342ae8c0228368c24161f5fb" }, { "url": "https://git.kernel.org/stable/c/fc530fe168bb2b745a93f553ad21fc25fd9cba3d" } ], "title": "media: usbtv: keep device alive while ALSA card exists", "x_generator": { "engine": "bippy-1.2.0" } } } }