264 lines
15 KiB
JSON
264 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-90032",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.782Z",
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"datePublished": "2026-09-16T10:33:33.197Z",
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"dateUpdated": "2026-10-19T08:56:49.082Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:56:49.082Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/media/usb/usbtv/usbtv-audio.c"
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],
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"versions": [
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{
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"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
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"lessThan": "97b5e8b22b98e287481a97a9a4cfebbb348738a5",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
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"lessThan": "503be26ff888cb3576e55d251895d290e8146f27",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
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"lessThan": "be0f7745f883386e5263b4e475686a81dfa87175",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
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"lessThan": "67374e3a00814dcdd46e9feca61f69f7f2d81957",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
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"lessThan": "239d1683e08b2aee2a15ef35706e1ea9a76681d8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
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"lessThan": "7690a86b193271322cd31ab77349a87aa10858e4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
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"lessThan": "1618257cb0aba4ce342ae8c0228368c24161f5fb",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "63ddf68de52efaac40a9287e44266ac30e71dd36",
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"lessThan": "fc530fe168bb2b745a93f553ad21fc25fd9cba3d",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/media/usb/usbtv/usbtv-audio.c"
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],
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"versions": [
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{
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"version": "3.18",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.18",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.270",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.221",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.188",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.157",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.110",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.51",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.5",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "5.10.270"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "5.15.221"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "6.1.188"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "6.6.157"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "6.12.110"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "6.18.51"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "7.2.5"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/97b5e8b22b98e287481a97a9a4cfebbb348738a5"
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},
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{
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"url": "https://git.kernel.org/stable/c/503be26ff888cb3576e55d251895d290e8146f27"
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},
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{
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"url": "https://git.kernel.org/stable/c/be0f7745f883386e5263b4e475686a81dfa87175"
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},
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{
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"url": "https://git.kernel.org/stable/c/67374e3a00814dcdd46e9feca61f69f7f2d81957"
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},
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{
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"url": "https://git.kernel.org/stable/c/239d1683e08b2aee2a15ef35706e1ea9a76681d8"
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},
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{
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"url": "https://git.kernel.org/stable/c/7690a86b193271322cd31ab77349a87aa10858e4"
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},
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{
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"url": "https://git.kernel.org/stable/c/1618257cb0aba4ce342ae8c0228368c24161f5fb"
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},
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{
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"url": "https://git.kernel.org/stable/c/fc530fe168bb2b745a93f553ad21fc25fd9cba3d"
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}
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],
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"title": "media: usbtv: keep device alive while ALSA card exists",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |