{"id":"CVE-2026-64601","state":"PUBLISHED","title":"ALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on each resubmission","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on each resubmission\n\nIn capture_urb_complete(), usb_anchor_urb() is called on every\ncompletion callback, but the URB is already anchored from the\ninitial submission in tascam_trigger_start(). Each redundant call\ncorrupts the anchor's doubly-linked list and inflates the URB\nrefcount. When usb_kill_anchored_urbs() traverses the list during\nstream stop / suspend / disconnect, the corrupted list leads to\nuse-after-free.\n\nRemove the redundant usb_anchor_urb() from the resubmit path.","publishedAt":"2026-08-06T07:13:53.926Z","updatedAt":"2026-08-17T04:58:24.207Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c1bb0c13e430623c26543baae5bb9ae21139db87","status":"affected","lessThan":"16f14f55141d4c55c3f321f93c328fff7cd6860a","versionType":"git"},{"version":"c1bb0c13e430623c26543baae5bb9ae21139db87","status":"affected","lessThan":"ab1db64912428cdf06a4f9542e16e0575e9ad59f","versionType":"git"},{"version":"c1bb0c13e430623c26543baae5bb9ae21139db87","status":"affected","lessThan":"5cff1529a2f9b3461a7f5a6e36a86682fc290534","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/usx2y/us144mkii_capture.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/usx2y/us144mkii_capture.c"]}],"references":["https://git.kernel.org/stable/c/16f14f55141d4c55c3f321f93c328fff7cd6860a","https://git.kernel.org/stable/c/ab1db64912428cdf06a4f9542e16e0575e9ad59f","https://git.kernel.org/stable/c/5cff1529a2f9b3461a7f5a6e36a86682fc290534"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64601.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64601","state":"PUBLISHED","datePublished":"2026-08-06T07:13:53.926Z","dateUpdated":"2026-08-17T04:58:24.207Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.799Z"},"containers":{"cna":{"title":"ALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on each resubmission","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on each resubmission\n\nIn capture_urb_complete(), usb_anchor_urb() is called on every\ncompletion callback, but the URB is already anchored from the\ninitial submission in tascam_trigger_start(). Each redundant call\ncorrupts the anchor's doubly-linked list and inflates the URB\nrefcount. When usb_kill_anchored_urbs() traverses the list during\nstream stop / suspend / disconnect, the corrupted list leads to\nuse-after-free.\n\nRemove the redundant usb_anchor_urb() from the resubmit path."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c1bb0c13e430623c26543baae5bb9ae21139db87","status":"affected","lessThan":"16f14f55141d4c55c3f321f93c328fff7cd6860a","versionType":"git"},{"version":"c1bb0c13e430623c26543baae5bb9ae21139db87","status":"affected","lessThan":"ab1db64912428cdf06a4f9542e16e0575e9ad59f","versionType":"git"},{"version":"c1bb0c13e430623c26543baae5bb9ae21139db87","status":"affected","lessThan":"5cff1529a2f9b3461a7f5a6e36a86682fc290534","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/usx2y/us144mkii_capture.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/usx2y/us144mkii_capture.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/16f14f55141d4c55c3f321f93c328fff7cd6860a"},{"url":"https://git.kernel.org/stable/c/ab1db64912428cdf06a4f9542e16e0575e9ad59f"},{"url":"https://git.kernel.org/stable/c/5cff1529a2f9b3461a7f5a6e36a86682fc290534"}],"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 bug is reached through local ALSA PCM open/ioctl paths on /dev/snd/pcmC*D* (START/STOP via tascam_pcm_trigger), not via network protocols; a present TASCAM US-144/US-144MKII is a deployment prerequisite, and Local is chosen over Physical under the uncertainty rule.\nAC:L - An attacker who can open the PCM device can deterministically start capture (submitting URBs that complete and hit capture_urb_complete), then stop/suspend to invoke usb_kill_anchored_urbs on the corrupted anchor; no conditions outside attacker control are required.\nPR:L - The PCM path has no capability checks; ordinary local access to ALSA device nodes (audio group or seat/udev ACLs on studio/desktop systems with this interface) is sufficient, not init-namespace root.\nUI:N - The attacker alone opens the PCM device, starts and stops the stream, and thereby triggers URB resubmission corruption and the subsequent kill/UAF path without any separate victim action.\nS:U - The use-after-free corrupts kernel USB/ALSA state within the same host kernel security authority and does not cross a VM, IOMMU, or other separate boundary.\nC:H - Corrupted usb_anchor list traversal during usb_kill_anchored_urbs yields a kernel use-after-free; per guidance UAF enables reclaim of freed objects and arbitrary kernel information disclosure.\nI:H - The same UAF on URB/anchor-linked objects can be turned into heap reuse and control-flow hijacking primitives, so integrity impact is High rather than a mere crash.\nA:H - Traversing the corrupted anchor list or under-referenced URB state during stream stop, suspend, or disconnect can oops/panic the kernel, giving High availability impact."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:58:24.207Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}