{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31778","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-03-09T15:48:24.140Z","datePublished":"2026-05-01T14:15:05.804Z","dateUpdated":"2026-05-11T22:15:37.687Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:15:37.687Z"},"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/caiaq/device.c"],"versions":[{"version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","lessThan":"02d9c5b0b5553a391448b6d655262bd829f90234","status":"affected","versionType":"git"},{"version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","lessThan":"3f7f8bae0d52cbd07ab04b76b6aac89ef98ee9f6","status":"affected","versionType":"git"},{"version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","lessThan":"66194c2575a4f567577ae70b1d7561163ce791a6","status":"affected","versionType":"git"},{"version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","lessThan":"a82c1bce2d1299dd3c686a8fe48cf75b79a403c7","status":"affected","versionType":"git"},{"version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","lessThan":"3178b62e2e31bab39f63d4c8e54bf4ee0a425627","status":"affected","versionType":"git"},{"version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","lessThan":"3afa2e67f3523a980a2f90fd63c22322ac2b9ce0","status":"affected","versionType":"git"},{"version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","lessThan":"7594a6464873d90fd229e5b94cdd3b92c9feabed","status":"affected","versionType":"git"},{"version":"bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a","lessThan":"45424e871abf2a152e247a9cff78359f18dd95c0","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/caiaq/device.c"],"versions":[{"version":"2.6.31","status":"affected"},{"version":"0","lessThan":"2.6.31","status":"unaffected","versionType":"semver"},{"version":"5.10.253","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.203","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.168","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.134","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.81","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.22","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.12","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","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":"2.6.31","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.6.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.12.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"7.0"}]}]}],"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"}}}}