{"schema":"threatline.record/2","record":{"id":"CVE-2026-97906","aliases":[],"summary":"bootconfig: Fix integer overflow in initrd size check","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbootconfig: Fix integer overflow in initrd size check\n\nSashiko reported that in get_boot_config_from_initrd(), a crafted initrd\nwith a huge bootconfig size (such as 0xFFFFFFFF) can cause the pointer\narithmetic:\n\n    data = ((void *)hdr) - size;\n\nto wrap around on 32-bit systems (or when pointer subtraction overflows).\nBecause data wraps around, the subsequent bounds check:\n\n    if ((unsigned long)data < initrd_start)\n\nevaluates to false, bypassing the check. The kernel then calls\nxbc_calc_checksum(data, size), which attempts to read 4GB of memory,\nhitting unmapped pages and triggering a fatal kernel page fault during\nearly boot. Furthermore, on 64-bit systems with an initrd > 4.29 GB, an\nunbounded 32-bit size can similarly bypass the initrd_start check.\n\nFix this by:\n1. Ensuring the initrd is at least large enough to contain the bootconfig\n   footer and verifying hdr is within the initrd bounds.\n2. Checking that size does not exceed XBC_DATA_MAX and does not exceed\n   the available space between initrd_start and hdr before performing\n   pointer subtraction.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97906","source_modified_at":"2026-10-21T12:53:32.335Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"de462e5f10718517bacf2f84c8aa2804567ef7df","lessThan":"97be05f33f79342ea65d9b99c9ad07a93b8eef5a","status":"affected","versionType":"git"},{"version":"de462e5f10718517bacf2f84c8aa2804567ef7df","lessThan":"4d45bc0f8cdf606d5409b5f64a8a6609f6520c03","status":"affected","versionType":"git"},{"version":"de462e5f10718517bacf2f84c8aa2804567ef7df","lessThan":"8d4343a411eaa182d323ab5b149496416015f27d","status":"affected","versionType":"git"},{"version":"de462e5f10718517bacf2f84c8aa2804567ef7df","lessThan":"bff9a1579e2c9b2a59fdf3793becc9d7bf5ff1a6","status":"affected","versionType":"git"},{"version":"de462e5f10718517bacf2f84c8aa2804567ef7df","lessThan":"7812d6dab0698001e50e8c2f901e17da3eb6f429","status":"affected","versionType":"git"},{"version":"32394df25d8e46935b442b429d74b37885c4f092","status":"affected","versionType":"git"},{"version":"5.6.14","lessThan":"5.7","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97906","source_modified_at":"2026-10-21T12:53:32.335Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.7","status":"affected"},{"version":"0","lessThan":"5.7","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97906","source_modified_at":"2026-10-21T12:53:32.335Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"97be05f33f79342ea65d9b99c9ad07a93b8eef5a","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97906","source_modified_at":"2026-10-21T12:53:32.335Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"4d45bc0f8cdf606d5409b5f64a8a6609f6520c03","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97906","source_modified_at":"2026-10-21T12:53:32.335Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"8d4343a411eaa182d323ab5b149496416015f27d","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97906","source_modified_at":"2026-10-21T12:53:32.335Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"7812d6dab0698001e50e8c2f901e17da3eb6f429","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97906","source_modified_at":"2026-10-21T12:53:32.335Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5.7","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.0021,"percentile":0.10646,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:22:31.640Z","modified_at":"2026-10-21T12:53:32.335Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-97906","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T12:53:32.335Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-97906","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/97be05f33f79342ea65d9b99c9ad07a93b8eef5a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/4d45bc0f8cdf606d5409b5f64a8a6609f6520c03"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/8d4343a411eaa182d323ab5b149496416015f27d"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/bff9a1579e2c9b2a59fdf3793becc9d7bf5ff1a6"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/7812d6dab0698001e50e8c2f901e17da3eb6f429"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-21T12:53:32.335Z","content_hash":"b62646a7c2162290c999b421b7d43d1a8432d65dd94aabdd15c30e2866273572"}}