{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23230","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:45.988Z","datePublished":"2026-02-18T14:53:34.078Z","dateUpdated":"2026-05-11T22:02:50.386Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:02:50.386Z"},"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/cached_dir.h"],"versions":[{"version":"ebe98f1447bbccf8228335c62d86af02a0ed23f7","lessThan":"569fecc56bfe4df66f05734d67daef887746656b","status":"affected","versionType":"git"},{"version":"ebe98f1447bbccf8228335c62d86af02a0ed23f7","lessThan":"4386f6af8aaedd0c5ad6f659b40cadcc8f423828","status":"affected","versionType":"git"},{"version":"ebe98f1447bbccf8228335c62d86af02a0ed23f7","lessThan":"3eaa22d688311c708b73f3c68bc6d0c8e3f0f77a","status":"affected","versionType":"git"},{"version":"ebe98f1447bbccf8228335c62d86af02a0ed23f7","lessThan":"c4b9edd55987384a1f201d3d07ff71e448d79c1b","status":"affected","versionType":"git"},{"version":"ebe98f1447bbccf8228335c62d86af02a0ed23f7","lessThan":"4cfa4c37dcbcfd70866e856200ed8a2894cac578","status":"affected","versionType":"git"},{"version":"ebe98f1447bbccf8228335c62d86af02a0ed23f7","lessThan":"ec306600d5ba7148c9dbf8f5a8f1f5c1a044a241","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/cached_dir.h"],"versions":[{"version":"6.1","status":"affected"},{"version":"0","lessThan":"6.1","status":"unaffected","versionType":"semver"},{"version":"6.1.164","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.125","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.72","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.11","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.1","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.1.164"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.6.125"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.12.72"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.18.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.19.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/569fecc56bfe4df66f05734d67daef887746656b"},{"url":"https://git.kernel.org/stable/c/4386f6af8aaedd0c5ad6f659b40cadcc8f423828"},{"url":"https://git.kernel.org/stable/c/3eaa22d688311c708b73f3c68bc6d0c8e3f0f77a"},{"url":"https://git.kernel.org/stable/c/c4b9edd55987384a1f201d3d07ff71e448d79c1b"},{"url":"https://git.kernel.org/stable/c/4cfa4c37dcbcfd70866e856200ed8a2894cac578"},{"url":"https://git.kernel.org/stable/c/ec306600d5ba7148c9dbf8f5a8f1f5c1a044a241"}],"title":"smb: client: split cached_fid bitfields to avoid shared-byte RMW races","x_generator":{"engine":"bippy-1.2.0"}}}}