{"api_version":"1","generated_at":"2026-08-16T17:37:17+00:00","cve":"CVE-2026-74500","urls":{"html":"https://cve.report/CVE-2026-74500","api":"https://cve.report/api/cve/CVE-2026-74500.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74500","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74500"},"summary":{"title":"ALSA: usb-audio: fix stack info leak in RME Digiface status","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: fix stack info leak in RME Digiface status\n\nsnd_rme_digiface_read_status() reads a four-word status block from the\ndevice into an uninitialised on-stack __le32 buf[4] and, whenever the\nvendor control-IN transfer does not return a negative error, copies all\nfour words into the caller's status[].\n\nsnd_usb_ctl_msg() copies the full requested size back into the caller's\nbuffer regardless of how many bytes the data stage actually delivered:\n\n\tbuf = kmemdup(data, size, GFP_KERNEL);\n\terr = usb_control_msg(dev, pipe, request, requesttype,\n\t\t\t      value, index, buf, size, timeout);\n\tmemcpy(data, buf, size);\n\nusb_control_msg() returns the transferred length on a short control-IN,\nwhich is a non-negative value, and writes only that many bytes.  The\nremainder of the copy back is the kmemdup()ed image of the caller's\nbuffer, so a device answering with a short data stage leaves the\ntrailing words of buf[] holding leftover kernel stack.  The only guard\nin the caller is err < 0, so those words are stored into status[].\n\nThey then reach user space: snd_rme_digiface_get_status_val() selects a\n16-bit halfword of status[] per the control's reg/mask, and the eight\nDigiface status controls together expose the whole 16-byte frame to an\nunprivileged reader of /dev/snd/controlC*.\n\nZero-initialise the buffer so a short read yields zeros instead of stack\nresidue.  This mirrors snd_rme_get_status1(), which already clears its\noutput word before the same kind of vendor read.\n\nDiscovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 13:17:54","updated_at":"2026-08-15 13:17:54"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/441aaad150c57edaf57ee482a79a3bf4c5b7e353","name":"https://git.kernel.org/stable/c/441aaad150c57edaf57ee482a79a3bf4c5b7e353","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/98dbfbb38e297c25c5b0af4a9018d71ac25e8554","name":"https://git.kernel.org/stable/c/98dbfbb38e297c25c5b0af4a9018d71ac25e8554","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7ba01e0d3539d9cf0aef3e82938f1648147744cc","name":"https://git.kernel.org/stable/c/7ba01e0d3539d9cf0aef3e82938f1648147744cc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b3a346d5c99dd73cf84711f2a43e42691990efd2","name":"https://git.kernel.org/stable/c/b3a346d5c99dd73cf84711f2a43e42691990efd2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74500","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74500","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 611a96f6acf2e74fe28cb90908a9c183862348ce b3a346d5c99dd73cf84711f2a43e42691990efd2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 611a96f6acf2e74fe28cb90908a9c183862348ce 7ba01e0d3539d9cf0aef3e82938f1648147744cc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 611a96f6acf2e74fe28cb90908a9c183862348ce 98dbfbb38e297c25c5b0af4a9018d71ac25e8554 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 611a96f6acf2e74fe28cb90908a9c183862348ce 441aaad150c57edaf57ee482a79a3bf4c5b7e353 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3089703ab71484a8b9a7641051181d11d60f870c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 50f63f11a6ddaa0d34574df72b3fa6ee257c057d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.10.14 6.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.11.3 6.12 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.103 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.44 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.8 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc6 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["sound/usb/mixer_quirks.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b3a346d5c99dd73cf84711f2a43e42691990efd2","status":"affected","version":"611a96f6acf2e74fe28cb90908a9c183862348ce","versionType":"git"},{"lessThan":"7ba01e0d3539d9cf0aef3e82938f1648147744cc","status":"affected","version":"611a96f6acf2e74fe28cb90908a9c183862348ce","versionType":"git"},{"lessThan":"98dbfbb38e297c25c5b0af4a9018d71ac25e8554","status":"affected","version":"611a96f6acf2e74fe28cb90908a9c183862348ce","versionType":"git"},{"lessThan":"441aaad150c57edaf57ee482a79a3bf4c5b7e353","status":"affected","version":"611a96f6acf2e74fe28cb90908a9c183862348ce","versionType":"git"},{"status":"affected","version":"3089703ab71484a8b9a7641051181d11d60f870c","versionType":"git"},{"status":"affected","version":"50f63f11a6ddaa0d34574df72b3fa6ee257c057d","versionType":"git"},{"lessThan":"6.11","status":"affected","version":"6.10.14","versionType":"semver"},{"lessThan":"6.12","status":"affected","version":"6.11.3","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["sound/usb/mixer_quirks.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.12"},{"lessThan":"6.12","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.103","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.44","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc6","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.103","versionStartIncluding":"6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.44","versionStartIncluding":"6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.8","versionStartIncluding":"6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc6","versionStartIncluding":"6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11.3","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: fix stack info leak in RME Digiface status\n\nsnd_rme_digiface_read_status() reads a four-word status block from the\ndevice into an uninitialised on-stack __le32 buf[4] and, whenever the\nvendor control-IN transfer does not return a negative error, copies all\nfour words into the caller's status[].\n\nsnd_usb_ctl_msg() copies the full requested size back into the caller's\nbuffer regardless of how many bytes the data stage actually delivered:\n\n\tbuf = kmemdup(data, size, GFP_KERNEL);\n\terr = usb_control_msg(dev, pipe, request, requesttype,\n\t\t\t      value, index, buf, size, timeout);\n\tmemcpy(data, buf, size);\n\nusb_control_msg() returns the transferred length on a short control-IN,\nwhich is a non-negative value, and writes only that many bytes.  The\nremainder of the copy back is the kmemdup()ed image of the caller's\nbuffer, so a device answering with a short data stage leaves the\ntrailing words of buf[] holding leftover kernel stack.  The only guard\nin the caller is err < 0, so those words are stored into status[].\n\nThey then reach user space: snd_rme_digiface_get_status_val() selects a\n16-bit halfword of status[] per the control's reg/mask, and the eight\nDigiface status controls together expose the whole 16-byte frame to an\nunprivileged reader of /dev/snd/controlC*.\n\nZero-initialise the buffer so a short read yields zeros instead of stack\nresidue.  This mirrors snd_rme_get_status1(), which already clears its\noutput word before the same kind of vendor read.\n\nDiscovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>"}],"providerMetadata":{"dateUpdated":"2026-08-15T12:27:26.359Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b3a346d5c99dd73cf84711f2a43e42691990efd2"},{"url":"https://git.kernel.org/stable/c/7ba01e0d3539d9cf0aef3e82938f1648147744cc"},{"url":"https://git.kernel.org/stable/c/98dbfbb38e297c25c5b0af4a9018d71ac25e8554"},{"url":"https://git.kernel.org/stable/c/441aaad150c57edaf57ee482a79a3bf4c5b7e353"}],"title":"ALSA: usb-audio: fix stack info leak in RME Digiface status","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74500","datePublished":"2026-08-15T12:27:26.359Z","dateReserved":"2026-08-15T05:44:03.907Z","dateUpdated":"2026-08-15T12:27:26.359Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 13:17:54","lastModifiedDate":"2026-08-15 13:17:54","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74500","Ordinal":"1","Title":"ALSA: usb-audio: fix stack info leak in RME Digiface status","CVE":"CVE-2026-74500","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74500","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: fix stack info leak in RME Digiface status\n\nsnd_rme_digiface_read_status() reads a four-word status block from the\ndevice into an uninitialised on-stack __le32 buf[4] and, whenever the\nvendor control-IN transfer does not return a negative error, copies all\nfour words into the caller's status[].\n\nsnd_usb_ctl_msg() copies the full requested size back into the caller's\nbuffer regardless of how many bytes the data stage actually delivered:\n\n\tbuf = kmemdup(data, size, GFP_KERNEL);\n\terr = usb_control_msg(dev, pipe, request, requesttype,\n\t\t\t      value, index, buf, size, timeout);\n\tmemcpy(data, buf, size);\n\nusb_control_msg() returns the transferred length on a short control-IN,\nwhich is a non-negative value, and writes only that many bytes.  The\nremainder of the copy back is the kmemdup()ed image of the caller's\nbuffer, so a device answering with a short data stage leaves the\ntrailing words of buf[] holding leftover kernel stack.  The only guard\nin the caller is err < 0, so those words are stored into status[].\n\nThey then reach user space: snd_rme_digiface_get_status_val() selects a\n16-bit halfword of status[] per the control's reg/mask, and the eight\nDigiface status controls together expose the whole 16-byte frame to an\nunprivileged reader of /dev/snd/controlC*.\n\nZero-initialise the buffer so a short read yields zeros instead of stack\nresidue.  This mirrors snd_rme_get_status1(), which already clears its\noutput word before the same kind of vendor read.\n\nDiscovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>","Type":"Description","Title":"ALSA: usb-audio: fix stack info leak in RME Digiface status"}]}}}