{"api_version":"1","generated_at":"2026-08-28T16:45:16+00:00","cve":"CVE-2026-80710","urls":{"html":"https://cve.report/CVE-2026-80710","api":"https://cve.report/api/cve/CVE-2026-80710.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80710","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80710"},"summary":{"title":"s390/dasd: Fix undersized format-check buffer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/dasd: Fix undersized format-check buffer\n\nfmt_buffer_size in dasd_eckd_check_device_format() is declared as\nint, even though one of the multiplicands, sizeof(struct eckd_count),\nis a size_t. The expression\n\n    trkcount * rpt_max * sizeof(struct eckd_count)\n\nis therefore correctly evaluated at 64-bit width, but the result is\nsilently truncated when it is stored back into the 32-bit\nfmt_buffer_size variable. For a sufficiently large track range\n(start_unit/stop_unit are caller-controlled) this truncation\nyields a buffer size far smaller than the number of tracks actually\nrequested. kzalloc() then succeeds with an undersized allocation,\nwhile the subsequent channel program build still operates on the\nuntruncated track count and writes past the end of that buffer.\n\nCompute the buffer size with check_mul_overflow() and keep it in a\nsize_t, so that a value that no longer fits results in -EINVAL\ninstead of a silently truncated allocation size.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-28 08:16:56","updated_at":"2026-08-28 08:16:56"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/aca18289c86f22d3fc2f3f6ff615286e7b1702f6","name":"https://git.kernel.org/stable/c/aca18289c86f22d3fc2f3f6ff615286e7b1702f6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/87f3389cd3920714c53e704778f7ca7f1cf0c39c","name":"https://git.kernel.org/stable/c/87f3389cd3920714c53e704778f7ca7f1cf0c39c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7f40b346462f563a0d6e841a77b5163d2a882a04","name":"https://git.kernel.org/stable/c/7f40b346462f563a0d6e841a77b5163d2a882a04","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9f88dda2f22927d22498801a92cab6a9424eaf86","name":"https://git.kernel.org/stable/c/9f88dda2f22927d22498801a92cab6a9424eaf86","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e16e0fc54120cee3c6f0362de95aab6792865857","name":"https://git.kernel.org/stable/c/e16e0fc54120cee3c6f0362de95aab6792865857","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80710","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80710","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8fd575200db5b53f6ea6818dd017f1b43190db12 aca18289c86f22d3fc2f3f6ff615286e7b1702f6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8fd575200db5b53f6ea6818dd017f1b43190db12 9f88dda2f22927d22498801a92cab6a9424eaf86 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8fd575200db5b53f6ea6818dd017f1b43190db12 e16e0fc54120cee3c6f0362de95aab6792865857 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8fd575200db5b53f6ea6818dd017f1b43190db12 87f3389cd3920714c53e704778f7ca7f1cf0c39c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8fd575200db5b53f6ea6818dd017f1b43190db12 7f40b346462f563a0d6e841a77b5163d2a882a04 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.7","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.151 6.6.* 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 * 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":["drivers/s390/block/dasd_eckd.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"aca18289c86f22d3fc2f3f6ff615286e7b1702f6","status":"affected","version":"8fd575200db5b53f6ea6818dd017f1b43190db12","versionType":"git"},{"lessThan":"9f88dda2f22927d22498801a92cab6a9424eaf86","status":"affected","version":"8fd575200db5b53f6ea6818dd017f1b43190db12","versionType":"git"},{"lessThan":"e16e0fc54120cee3c6f0362de95aab6792865857","status":"affected","version":"8fd575200db5b53f6ea6818dd017f1b43190db12","versionType":"git"},{"lessThan":"87f3389cd3920714c53e704778f7ca7f1cf0c39c","status":"affected","version":"8fd575200db5b53f6ea6818dd017f1b43190db12","versionType":"git"},{"lessThan":"7f40b346462f563a0d6e841a77b5163d2a882a04","status":"affected","version":"8fd575200db5b53f6ea6818dd017f1b43190db12","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/s390/block/dasd_eckd.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.7"},{"lessThan":"4.7","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.151","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","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.151","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.103","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.44","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.8","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"4.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/dasd: Fix undersized format-check buffer\n\nfmt_buffer_size in dasd_eckd_check_device_format() is declared as\nint, even though one of the multiplicands, sizeof(struct eckd_count),\nis a size_t. The expression\n\n    trkcount * rpt_max * sizeof(struct eckd_count)\n\nis therefore correctly evaluated at 64-bit width, but the result is\nsilently truncated when it is stored back into the 32-bit\nfmt_buffer_size variable. For a sufficiently large track range\n(start_unit/stop_unit are caller-controlled) this truncation\nyields a buffer size far smaller than the number of tracks actually\nrequested. kzalloc() then succeeds with an undersized allocation,\nwhile the subsequent channel program build still operates on the\nuntruncated track count and writes past the end of that buffer.\n\nCompute the buffer size with check_mul_overflow() and keep it in a\nsize_t, so that a value that no longer fits results in -EINVAL\ninstead of a silently truncated allocation size."}],"providerMetadata":{"dateUpdated":"2026-08-28T06:53:10.028Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/aca18289c86f22d3fc2f3f6ff615286e7b1702f6"},{"url":"https://git.kernel.org/stable/c/9f88dda2f22927d22498801a92cab6a9424eaf86"},{"url":"https://git.kernel.org/stable/c/e16e0fc54120cee3c6f0362de95aab6792865857"},{"url":"https://git.kernel.org/stable/c/87f3389cd3920714c53e704778f7ca7f1cf0c39c"},{"url":"https://git.kernel.org/stable/c/7f40b346462f563a0d6e841a77b5163d2a882a04"}],"title":"s390/dasd: Fix undersized format-check buffer","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80710","datePublished":"2026-08-28T06:53:10.028Z","dateReserved":"2026-08-26T14:34:25.787Z","dateUpdated":"2026-08-28T06:53:10.028Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-28 08:16:56","lastModifiedDate":"2026-08-28 08:16:56","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80710","Ordinal":"1","Title":"s390/dasd: Fix undersized format-check buffer","CVE":"CVE-2026-80710","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80710","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/dasd: Fix undersized format-check buffer\n\nfmt_buffer_size in dasd_eckd_check_device_format() is declared as\nint, even though one of the multiplicands, sizeof(struct eckd_count),\nis a size_t. The expression\n\n    trkcount * rpt_max * sizeof(struct eckd_count)\n\nis therefore correctly evaluated at 64-bit width, but the result is\nsilently truncated when it is stored back into the 32-bit\nfmt_buffer_size variable. For a sufficiently large track range\n(start_unit/stop_unit are caller-controlled) this truncation\nyields a buffer size far smaller than the number of tracks actually\nrequested. kzalloc() then succeeds with an undersized allocation,\nwhile the subsequent channel program build still operates on the\nuntruncated track count and writes past the end of that buffer.\n\nCompute the buffer size with check_mul_overflow() and keep it in a\nsize_t, so that a value that no longer fits results in -EINVAL\ninstead of a silently truncated allocation size.","Type":"Description","Title":"s390/dasd: Fix undersized format-check buffer"}]}}}