{"id":"CVE-2026-68145","revision":null,"records":[{"revision":"08d935967ddb4779a56ab88bb380bfdc","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-68145","aliases":[],"title":"iomap: fix out-of-bounds bitmap_set() with zero-length range","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niomap: fix out-of-bounds bitmap_set() with zero-length range\n\nifs_set_range_dirty() and ifs_set_range_uptodate() compute last_blk\nas (off + len - 1) >> i_blkbits.  When off is 0 and len is 0, the\nunsigned subtraction underflows to SIZE_MAX, producing a huge\nlast_blk and nr_blks value that causes bitmap_set() to write far\nbeyond the ifs->state allocation.\n\nRegarding ifs_set_range_uptodate(), it is temporarily safe because len\ncannot be passed in as 0. However, for ifs_set_range_dirty() this is\nreachable from __iomap_write_end(): when copy_folio_from_iter_atomic()\nreturns 0 (e.g. user buffer fault) and the folio is already uptodate,\nthe guard at the top of __iomap_write_end() does not trigger because\n!folio_test_uptodate() is false, and iomap_set_range_dirty() is called\nwith copied == 0.\n\nAdd a !len guard to both functions before the computation, so that a\nzero-length range is a no-op.","state":0,"publishedAt":"2026-08-10T11:59:09.721+00:00","modifiedAt":"2026-10-19T20:58:53.891+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/iomap/buffered-io.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4ce02c67972211be488408c275c8fbf19faf29b3\",\n                            \"lessThan\": \"48829622212f6b8f49155889aecc818ba28ba680\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4ce02c67972211be488408c275c8fbf19faf29b3\",\n                            \"lessThan\": \"fb4fad9105c88b1d82f1b3c39e3b6abea8249af6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4ce02c67972211be488408c275c8fbf19faf29b3\",\n                            \"lessThan\": \"7037e7bdcd26f46c080b8ce307dee5cb471c4b7c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4ce02c67972211be488408c275c8fbf19faf29b3\",\n                            \"lessThan\": \"c5b6a48a8a716a7730e39af1cad083dc4ec955ce\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4ce02c67972211be488408c275c8fbf19faf29b3\",\n                            \"lessThan\": \"9c7d8f7c8994c790fca501dc45ce66e7356cbe05\",\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/iomap/buffered-io.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.6\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.153\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.101\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.42\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.6\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/48829622212f6b8f49155889aecc818ba28ba680","https://git.kernel.org/stable/c/fb4fad9105c88b1d82f1b3c39e3b6abea8249af6","https://git.kernel.org/stable/c/7037e7bdcd26f46c080b8ce307dee5cb471c4b7c","https://git.kernel.org/stable/c/c5b6a48a8a716a7730e39af1cad083dc4ec955ce","https://git.kernel.org/stable/c/9c7d8f7c8994c790fca501dc45ce66e7356cbe05"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68145","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-68145","identifiers":["CVE-2026-68145"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV 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