{"api_version":"1","generated_at":"2026-05-02T05:33:18+00:00","cve":"CVE-2026-31778","urls":{"html":"https://cve.report/CVE-2026-31778","api":"https://cve.report/api/cve/CVE-2026-31778.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31778","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31778"},"summary":{"title":"ALSA: caiaq: fix stack out-of-bounds read in init_card","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: fix stack out-of-bounds read in init_card\n\nThe loop creates a whitespace-stripped copy of the card shortname\nwhere `len < sizeof(card->id)` is used for the bounds check. Since\nsizeof(card->id) is 16 and the local id buffer is also 16 bytes,\nwriting 16 non-space characters fills the entire buffer,\noverwriting the terminating nullbyte.\n\nWhen this non-null-terminated string is later passed to\nsnd_card_set_id() -> copy_valid_id_string(), the function scans\nforward with `while (*nid && ...)` and reads past the end of the\nstack buffer, reading the contents of the stack.\n\nA USB device with a product name containing many non-ASCII, non-space\ncharacters (e.g. multibyte UTF-8) will reliably trigger this as follows:\n\n  BUG: KASAN: stack-out-of-bounds in copy_valid_id_string\n       sound/core/init.c:696 [inline]\n  BUG: KASAN: stack-out-of-bounds in snd_card_set_id_no_lock+0x698/0x74c\n       sound/core/init.c:718\n\nThe off-by-one has been present since commit bafeee5b1f8d (\"ALSA:\nsnd_usb_caiaq: give better shortname\") from June 2009 (v2.6.31-rc1),\nwhich first introduced this whitespace-stripping loop. The original\ncode never accounted for the null terminator when bounding the copy.\n\nFix this by changing the loop bound to `sizeof(card->id) - 1`,\nensuring at least one byte remains as the null terminator.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-01 15:16:41","updated_at":"2026-05-01 15:24:14"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/66194c2575a4f567577ae70b1d7561163ce791a6","name":"https://git.kernel.org/stable/c/66194c2575a4f567577ae70b1d7561163ce791a6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/45424e871abf2a152e247a9cff78359f18dd95c0","name":"https://git.kernel.org/stable/c/45424e871abf2a152e247a9cff78359f18dd95c0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a82c1bce2d1299dd3c686a8fe48cf75b79a403c7","name":"https://git.kernel.org/stable/c/a82c1bce2d1299dd3c686a8fe48cf75b79a403c7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3afa2e67f3523a980a2f90fd63c22322ac2b9ce0","name":"https://git.kernel.org/stable/c/3afa2e67f3523a980a2f90fd63c22322ac2b9ce0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/02d9c5b0b5553a391448b6d655262bd829f90234","name":"https://git.kernel.org/stable/c/02d9c5b0b5553a391448b6d655262bd829f90234","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3178b62e2e31bab39f63d4c8e54bf4ee0a425627","name":"https://git.kernel.org/stable/c/3178b62e2e31bab39f63d4c8e54bf4ee0a425627","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3f7f8bae0d52cbd07ab04b76b6aac89ef98ee9f6","name":"https://git.kernel.org/stable/c/3f7f8bae0d52cbd07ab04b76b6aac89ef98ee9f6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7594a6464873d90fd229e5b94cdd3b92c9feabed","name":"https://git.kernel.org/stable/c/7594a6464873d90fd229e5b94cdd3b92c9feabed","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31778","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31778","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a 02d9c5b0b5553a391448b6d655262bd829f90234 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a 3f7f8bae0d52cbd07ab04b76b6aac89ef98ee9f6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a 66194c2575a4f567577ae70b1d7561163ce791a6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a a82c1bce2d1299dd3c686a8fe48cf75b79a403c7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.203 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.168 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.134 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.81 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.22 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.12 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * 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/caiaq/device.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"02d9c5b0b5553a391448b6d655262bd829f90234","status":"affected","version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","versionType":"git"},{"lessThan":"3f7f8bae0d52cbd07ab04b76b6aac89ef98ee9f6","status":"affected","version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","versionType":"git"},{"lessThan":"66194c2575a4f567577ae70b1d7561163ce791a6","status":"affected","version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","versionType":"git"},{"lessThan":"a82c1bce2d1299dd3c686a8fe48cf75b79a403c7","status":"affected","version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","versionType":"git"},{"lessThan":"3178b62e2e31bab39f63d4c8e54bf4ee0a425627","status":"affected","version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","versionType":"git"},{"lessThan":"3afa2e67f3523a980a2f90fd63c22322ac2b9ce0","status":"affected","version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","versionType":"git"},{"lessThan":"7594a6464873d90fd229e5b94cdd3b92c9feabed","status":"affected","version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","versionType":"git"},{"lessThan":"45424e871abf2a152e247a9cff78359f18dd95c0","status":"affected","version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["sound/usb/caiaq/device.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.31"},{"lessThan":"2.6.31","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.168","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.134","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.81","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.22","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.12","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.253","versionStartIncluding":"2.6.31","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"2.6.31","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.168","versionStartIncluding":"2.6.31","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.134","versionStartIncluding":"2.6.31","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.81","versionStartIncluding":"2.6.31","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.22","versionStartIncluding":"2.6.31","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.12","versionStartIncluding":"2.6.31","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"2.6.31","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: fix stack out-of-bounds read in init_card\n\nThe loop creates a whitespace-stripped copy of the card shortname\nwhere `len < sizeof(card->id)` is used for the bounds check. Since\nsizeof(card->id) is 16 and the local id buffer is also 16 bytes,\nwriting 16 non-space characters fills the entire buffer,\noverwriting the terminating nullbyte.\n\nWhen this non-null-terminated string is later passed to\nsnd_card_set_id() -> copy_valid_id_string(), the function scans\nforward with `while (*nid && ...)` and reads past the end of the\nstack buffer, reading the contents of the stack.\n\nA USB device with a product name containing many non-ASCII, non-space\ncharacters (e.g. multibyte UTF-8) will reliably trigger this as follows:\n\n  BUG: KASAN: stack-out-of-bounds in copy_valid_id_string\n       sound/core/init.c:696 [inline]\n  BUG: KASAN: stack-out-of-bounds in snd_card_set_id_no_lock+0x698/0x74c\n       sound/core/init.c:718\n\nThe off-by-one has been present since commit bafeee5b1f8d (\"ALSA:\nsnd_usb_caiaq: give better shortname\") from June 2009 (v2.6.31-rc1),\nwhich first introduced this whitespace-stripping loop. The original\ncode never accounted for the null terminator when bounding the copy.\n\nFix this by changing the loop bound to `sizeof(card->id) - 1`,\nensuring at least one byte remains as the null terminator."}],"providerMetadata":{"dateUpdated":"2026-05-01T14:15:05.804Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/02d9c5b0b5553a391448b6d655262bd829f90234"},{"url":"https://git.kernel.org/stable/c/3f7f8bae0d52cbd07ab04b76b6aac89ef98ee9f6"},{"url":"https://git.kernel.org/stable/c/66194c2575a4f567577ae70b1d7561163ce791a6"},{"url":"https://git.kernel.org/stable/c/a82c1bce2d1299dd3c686a8fe48cf75b79a403c7"},{"url":"https://git.kernel.org/stable/c/3178b62e2e31bab39f63d4c8e54bf4ee0a425627"},{"url":"https://git.kernel.org/stable/c/3afa2e67f3523a980a2f90fd63c22322ac2b9ce0"},{"url":"https://git.kernel.org/stable/c/7594a6464873d90fd229e5b94cdd3b92c9feabed"},{"url":"https://git.kernel.org/stable/c/45424e871abf2a152e247a9cff78359f18dd95c0"}],"title":"ALSA: caiaq: fix stack out-of-bounds read in init_card","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31778","datePublished":"2026-05-01T14:15:05.804Z","dateReserved":"2026-03-09T15:48:24.140Z","dateUpdated":"2026-05-01T14:15:05.804Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-01 15:16:41","lastModifiedDate":"2026-05-01 15:24:14","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31778","Ordinal":"1","Title":"ALSA: caiaq: fix stack out-of-bounds read in init_card","CVE":"CVE-2026-31778","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31778","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: fix stack out-of-bounds read in init_card\n\nThe loop creates a whitespace-stripped copy of the card shortname\nwhere `len < sizeof(card->id)` is used for the bounds check. Since\nsizeof(card->id) is 16 and the local id buffer is also 16 bytes,\nwriting 16 non-space characters fills the entire buffer,\noverwriting the terminating nullbyte.\n\nWhen this non-null-terminated string is later passed to\nsnd_card_set_id() -> copy_valid_id_string(), the function scans\nforward with `while (*nid && ...)` and reads past the end of the\nstack buffer, reading the contents of the stack.\n\nA USB device with a product name containing many non-ASCII, non-space\ncharacters (e.g. multibyte UTF-8) will reliably trigger this as follows:\n\n  BUG: KASAN: stack-out-of-bounds in copy_valid_id_string\n       sound/core/init.c:696 [inline]\n  BUG: KASAN: stack-out-of-bounds in snd_card_set_id_no_lock+0x698/0x74c\n       sound/core/init.c:718\n\nThe off-by-one has been present since commit bafeee5b1f8d (\"ALSA:\nsnd_usb_caiaq: give better shortname\") from June 2009 (v2.6.31-rc1),\nwhich first introduced this whitespace-stripping loop. The original\ncode never accounted for the null terminator when bounding the copy.\n\nFix this by changing the loop bound to `sizeof(card->id) - 1`,\nensuring at least one byte remains as the null terminator.","Type":"Description","Title":"ALSA: caiaq: fix stack out-of-bounds read in init_card"}]}}}