{"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"}}}}