{"id":"CVE-2026-23230","revision":"2851fd0984a84280a32236eeb2ab4541","records":[{"revision":"2851fd0984a84280a32236eeb2ab4541","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-23230","aliases":[],"title":"smb: client: split cached_fid bitfields to avoid shared-byte RMW races","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: split cached_fid bitfields to avoid shared-byte RMW races\n\nis_open, has_lease and on_list are stored in the same bitfield byte in\nstruct cached_fid but are updated in different code paths that may run\nconcurrently. Bitfield assignments generate byte read–modify–write\noperations (e.g. `orb $mask, addr` on x86_64), so updating one flag can\nrestore stale values of the others.\n\nA possible interleaving is:\n    CPU1: load old byte (has_lease=1, on_list=1)\n    CPU2: clear both flags (store 0)\n    CPU1: RMW store (old | IS_OPEN) -> reintroduces cleared bits\n\nTo avoid this class of races, convert these flags to separate bool\nfields.","state":0,"publishedAt":"2026-02-18T14:53:34.078+00:00","modifiedAt":"2026-10-19T18:35:39.3+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/smb/client/cached_dir.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"ebe98f1447bbccf8228335c62d86af02a0ed23f7\",\n                            \"lessThan\": \"569fecc56bfe4df66f05734d67daef887746656b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ebe98f1447bbccf8228335c62d86af02a0ed23f7\",\n                            \"lessThan\": \"4386f6af8aaedd0c5ad6f659b40cadcc8f423828\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ebe98f1447bbccf8228335c62d86af02a0ed23f7\",\n                            \"lessThan\": \"3eaa22d688311c708b73f3c68bc6d0c8e3f0f77a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ebe98f1447bbccf8228335c62d86af02a0ed23f7\",\n                            \"lessThan\": \"c4b9edd55987384a1f201d3d07ff71e448d79c1b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ebe98f1447bbccf8228335c62d86af02a0ed23f7\",\n                            \"lessThan\": \"4cfa4c37dcbcfd70866e856200ed8a2894cac578\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ebe98f1447bbccf8228335c62d86af02a0ed23f7\",\n                            \"lessThan\": \"ec306600d5ba7148c9dbf8f5a8f1f5c1a044a241\",\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/smb/client/cached_dir.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.1\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.164\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.125\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.72\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.11\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.1\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/569fecc56bfe4df66f05734d67daef887746656b","https://git.kernel.org/stable/c/4386f6af8aaedd0c5ad6f659b40cadcc8f423828","https://git.kernel.org/stable/c/3eaa22d688311c708b73f3c68bc6d0c8e3f0f77a","https://git.kernel.org/stable/c/c4b9edd55987384a1f201d3d07ff71e448d79c1b","https://git.kernel.org/stable/c/4cfa4c37dcbcfd70866e856200ed8a2894cac578","https://git.kernel.org/stable/c/ec306600d5ba7148c9dbf8f5a8f1f5c1a044a241"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23230","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-23230","identifiers":["CVE-2026-23230"]},"retained":false,"historicalAffected":[]}],"coverage":[]}