{"id":"CVE-2026-89490","revision":"49a9d87272c842099f38d74b9c6e0b1d","records":[{"revision":"49a9d87272c842099f38d74b9c6e0b1d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89490","aliases":[],"title":"ocfs2: fix readdir position truncation on 32-bit kernels","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix readdir position truncation on 32-bit kernels\n\nIn ocfs2_dir_foreach_blk_el(), the directory cookie position is\nrebuilt with\n\n\tctx->pos = (ctx->pos & ~(sb->s_blocksize - 1)) | offset;\n\n`ctx->pos` is loff_t (signed 64-bit), while `sb->s_blocksize` is\nunsigned long.  On 32-bit kernels unsigned long is 32-bit, so the mask\n\n\t~(sb->s_blocksize - 1)\n\nis computed as a 32-bit unsigned value (e.g. 0xfffff000 for a 4 KiB\nblock size).  In the AND expression with the 64-bit `ctx->pos`, that\nunsigned operand is zero-extended to 64 bits per the usual arithmetic\nconversions, yielding 0x00000000fffff000.  The high 32 bits of\n`ctx->pos` are silently cleared, even though directory size is\nallowed to exceed 4 GiB.\n\nWhen readdir() crosses the 4 GiB boundary on a 32-bit kernel the\nposition is reset back into the first 4 GiB block, making the\nre-validation path re-enumerate already-returned dirents indefinitely.\n\nThis is ocfs2_dir_foreach_blk_el(), the extent-list readdir path taken\nfor all non-inline directories, so a directory large enough to cross\n4 GiB reaches it.\n\nThis is the same class of bug that commit 3dce5bb82c97 (\"exfat: Fix\nbitwise operation having different size\") fixed in exfat, and the\nfix mirrors the equivalent ext4 fix in this series.  Cast the operand\nto loff_t so the mask is 64-bit before the AND:\n\n\tctx->pos = (ctx->pos & ~((loff_t)sb->s_blocksize - 1)) | offset;\n\n64-bit kernels are unaffected.","state":0,"publishedAt":"2026-09-11T19:43:42.808+00:00","modifiedAt":"2026-10-19T08:47:41.93+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/ocfs2/dir.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\n                            \"lessThan\": \"c28dc3407937aa8f225942538cd585c9b28ea65a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\n                            \"lessThan\": \"94569154ba49f5f85645d2019c8e206213d8404e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\n                            \"lessThan\": \"1ae7029823ae4c91664cb32eec7fb8dd5e1a337a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\n                            \"lessThan\": \"f9dd5cad8d09110ddff2db1fe756aae93c7552ff\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\n                            \"lessThan\": \"1001fb3b69a11eaa0dc7c7428f6edfa48b88997a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\n                            \"lessThan\": \"c0c165487a2ea5a37ddcdab4259157b7a527129c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\n                            \"lessThan\": \"b53e2b271eeb6040c2a4a78230c570dc41cdcfa4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\n                            \"lessThan\": \"a63308ab426f3a3c7e33b02c150ea59054620261\",\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/ocfs2/dir.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.16\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.16\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\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/c28dc3407937aa8f225942538cd585c9b28ea65a","https://git.kernel.org/stable/c/94569154ba49f5f85645d2019c8e206213d8404e","https://git.kernel.org/stable/c/1ae7029823ae4c91664cb32eec7fb8dd5e1a337a","https://git.kernel.org/stable/c/f9dd5cad8d09110ddff2db1fe756aae93c7552ff","https://git.kernel.org/stable/c/1001fb3b69a11eaa0dc7c7428f6edfa48b88997a","https://git.kernel.org/stable/c/c0c165487a2ea5a37ddcdab4259157b7a527129c","https://git.kernel.org/stable/c/b53e2b271eeb6040c2a4a78230c570dc41cdcfa4","https://git.kernel.org/stable/c/a63308ab426f3a3c7e33b02c150ea59054620261"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89490","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89490","identifiers":["CVE-2026-89490"]},"retained":false,"historicalAffected":[]}],"coverage":[]}