{"id":"CVE-2026-97906","revision":"2141458842a4455e926ee868ac81fcb5","records":[{"revision":"2141458842a4455e926ee868ac81fcb5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97906","aliases":[],"title":"bootconfig: Fix integer overflow in initrd size check","description":"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.","state":0,"publishedAt":"2026-09-25T10:22:31.64+00:00","modifiedAt":"2026-10-21T12:53:32.335+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"init/main.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"de462e5f10718517bacf2f84c8aa2804567ef7df\",\n                            \"lessThan\": \"97be05f33f79342ea65d9b99c9ad07a93b8eef5a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"de462e5f10718517bacf2f84c8aa2804567ef7df\",\n                            \"lessThan\": \"4d45bc0f8cdf606d5409b5f64a8a6609f6520c03\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"de462e5f10718517bacf2f84c8aa2804567ef7df\",\n                            \"lessThan\": \"8d4343a411eaa182d323ab5b149496416015f27d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"de462e5f10718517bacf2f84c8aa2804567ef7df\",\n                            \"lessThan\": \"bff9a1579e2c9b2a59fdf3793becc9d7bf5ff1a6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"de462e5f10718517bacf2f84c8aa2804567ef7df\",\n                            \"lessThan\": \"7812d6dab0698001e50e8c2f901e17da3eb6f429\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"32394df25d8e46935b442b429d74b37885c4f092\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5.6.14\",\n                            \"lessThan\": \"5.7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"init/main.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.160\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/97be05f33f79342ea65d9b99c9ad07a93b8eef5a","https://git.kernel.org/stable/c/4d45bc0f8cdf606d5409b5f64a8a6609f6520c03","https://git.kernel.org/stable/c/8d4343a411eaa182d323ab5b149496416015f27d","https://git.kernel.org/stable/c/bff9a1579e2c9b2a59fdf3793becc9d7bf5ff1a6","https://git.kernel.org/stable/c/7812d6dab0698001e50e8c2f901e17da3eb6f429"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97906","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97906","identifiers":["CVE-2026-97906"]},"retained":false,"historicalAffected":[]}],"coverage":[]}