{"id":"CVE-2026-80807","revision":"f6c10ee418aa44e4a6be469e0f8292c8","records":[{"revision":"f6c10ee418aa44e4a6be469e0f8292c8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80807","aliases":[],"title":"nilfs2: reject invalid block index in GC ioctl","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: reject invalid block index in GC ioctl\n\nSyzbot reported list corruption caused by a double list_add_tail() call on\nbh->b_assoc_buffers within nilfs_lookup_dirty_data_buffers().\n\nAnalysis revealed that the root cause was the insertion of a page/folio\nwith a page index of ULONG_MAX into the page cache via the GC ioctl.\nfilemap_get_folios_tag(), called by nilfs_lookup_dirty_data_buffers(),\nrepeatedly detects a dirty folio with a page index of ULONG_MAX due to\nindex wrap-around, leading to duplicate processing of dirty buffers.\n\nAs a preparatory step, the GC ioctl loads the page/folio of the block to\nbe moved during GC and inserts it into the page cache based on information\nin the nilfs_vdesc structure passed as an argument.  Normally, this does\nnot cause issues because the user-space GC library configures the\nnilfs_vdesc structure properly.  However, since there is no range check on\nthe parameters determining the page index, a request with artificially\ncrafted parameters -- such as those generated by Syzbot -- can result in a\npage/folio being inserted with a page index of ULONG_MAX, triggering the\nabove problem.\n\nThis resolves the issue by checking the ranges of 'vd_offset' and\n'vd_vblocknr' in the nilfs_vdesc structure that determine the page index,\nthereby preventing the invalid page/folio insertions.","state":0,"publishedAt":"2026-09-04T15:13:23.605+00:00","modifiedAt":"2026-10-19T08:44:00.36+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                        \"fs/nilfs2/ioctl.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"7942b919f7321f95a777d396ff7894a7a83dc9b0\",\n                            \"lessThan\": \"898404cdf882d7b54f1132f75570984ca3214796\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7942b919f7321f95a777d396ff7894a7a83dc9b0\",\n                            \"lessThan\": \"ba8a8b563a28d358c45c62a306d421434a058648\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7942b919f7321f95a777d396ff7894a7a83dc9b0\",\n                            \"lessThan\": \"3bd064ccc70b85f9a3d53aece29dc8473be5a226\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7942b919f7321f95a777d396ff7894a7a83dc9b0\",\n                            \"lessThan\": \"a5e776e2937581d67ec5b9b4d27b0f70d7baa6b1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7942b919f7321f95a777d396ff7894a7a83dc9b0\",\n                            \"lessThan\": \"68aa9ab6f8f2895713aa6ddf781463ed8ea5ba44\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7942b919f7321f95a777d396ff7894a7a83dc9b0\",\n                            \"lessThan\": \"e447f7edb99bd00cec63d6f3049e2e5074946f71\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7942b919f7321f95a777d396ff7894a7a83dc9b0\",\n                            \"lessThan\": \"ec6ddf271dfa4c7e3147bc2c8b2bad4315f316a1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7942b919f7321f95a777d396ff7894a7a83dc9b0\",\n                            \"lessThan\": \"fbcfb75c20d71a5b542ad4ac3b79d10b997c8152\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7942b919f7321f95a777d396ff7894a7a83dc9b0\",\n                            \"lessThan\": \"a1735eae55448bc79c2da6593455791e886f6ed8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\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                        \"fs/nilfs2/ioctl.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.30\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.30\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.269\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.220\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.187\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.156\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.108\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.47\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.11\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.1\",\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/898404cdf882d7b54f1132f75570984ca3214796","https://git.kernel.org/stable/c/ba8a8b563a28d358c45c62a306d421434a058648","https://git.kernel.org/stable/c/3bd064ccc70b85f9a3d53aece29dc8473be5a226","https://git.kernel.org/stable/c/a5e776e2937581d67ec5b9b4d27b0f70d7baa6b1","https://git.kernel.org/stable/c/68aa9ab6f8f2895713aa6ddf781463ed8ea5ba44","https://git.kernel.org/stable/c/e447f7edb99bd00cec63d6f3049e2e5074946f71","https://git.kernel.org/stable/c/ec6ddf271dfa4c7e3147bc2c8b2bad4315f316a1","https://git.kernel.org/stable/c/fbcfb75c20d71a5b542ad4ac3b79d10b997c8152","https://git.kernel.org/stable/c/a1735eae55448bc79c2da6593455791e886f6ed8"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80807","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80807","identifiers":["CVE-2026-80807"]},"retained":false,"historicalAffected":[]}],"coverage":[]}