CVE-2026-23230

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Bitfield assignments generate byte read\u2013modify\u2013write\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"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerability is in the SMB client code (fs/smb/client/). The race is triggered between processing a server's create response (setting is_open) and the server sending a lease break notification. A malicious SMB server can trigger this remotely over the network.\nAC:L - The attacker (malicious SMB server) controls when lease breaks are sent and can time them immediately after the create response. The attacker can retry many times across many directory opens, and the RMW race window is inherent to every bitfield write, making it reliably triggerable.\nPR:N - The attacker is the SMB server, requiring no privileges on the victim system. The lease break is processed as part of normal SMB protocol handling with no additional authentication check beyond the existing session.\nUI:R - The victim must mount an SMB share from the attacker's server (or a compromised server), which requires explicit user or administrator action.\nS:U - The vulnerability impacts the kernel where the SMB client runs; it does not cross a security boundary such as a VM or sandbox.\nC:H - The race can restore has_lease after the lease reference was dropped, leading to reference count corruption and use-after-free. UAF on heap objects gives the attacker read primitives over arbitrary kernel memory through heap spraying.\nI:H - The use-after-free from reference count corruption allows the attacker to reclaim the freed cached_fid object with controlled data, enabling arbitrary kernel write primitives and potential code execution.\nA:H - The reference count corruption and list corruption caused by the restored stale flags will lead to double-free, use-after-free, or list corruption, all of which reliably cause kernel panics/oops."}]}], "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": 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"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:*:*:*:*:*:*:*:*", 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"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"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-06-02T13:01:05.733Z"}, "affected": [{"vendor": "Siemens", "product": "RUGGEDCOM RST2428P", "versions": [{"status": "affected", "version": "0", "lessThan": "V4.0", "versionType": "custom"}], "defaultStatus": "unknown"}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-253495.html"}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-23230", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": 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The race is triggered between processing a server's create response (setting is_open) and the server sending a lease break notification. A malicious SMB server can trigger this remotely over the network.\nAC:L - The attacker (malicious SMB server) controls when lease breaks are sent and can time them immediately after the create response. The attacker can retry many times across many directory opens, and the RMW race window is inherent to every bitfield write, making it reliably triggerable.\nPR:N - The attacker is the SMB server, requiring no privileges on the victim system. The lease break is processed as part of normal SMB protocol handling with no additional authentication check beyond the existing session.\nUI:R - The victim must mount an SMB share from the attacker's server (or a compromised server), which requires explicit user or administrator action.\nS:U - The vulnerability impacts the kernel where the SMB client runs; it does not cross a security boundary such as a VM or sandbox.\nC:H - The race can restore has_lease after the lease reference was dropped, leading to reference count corruption and use-after-free. UAF on heap objects gives the attacker read primitives over arbitrary kernel memory through heap spraying.\nI:H - The use-after-free from reference count corruption allows the attacker to reclaim the freed cached_fid object with controlled data, enabling arbitrary kernel write primitives and potential code execution.\nA:H - The reference count corruption and list corruption caused by the restored stale flags will lead to double-free, use-after-free, or list corruption, all of which reliably cause kernel panics/oops."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "ebe98f1447bbccf8228335c62d86af02a0ed23f7", "lessThan": "569fecc56bfe4df66f05734d67daef887746656b", "versionType": "git"}, {"status": "affected", "version": "ebe98f1447bbccf8228335c62d86af02a0ed23f7", "lessThan": "4386f6af8aaedd0c5ad6f659b40cadcc8f423828", "versionType": "git"}, {"status": "affected", "version": "ebe98f1447bbccf8228335c62d86af02a0ed23f7", "lessThan": "3eaa22d688311c708b73f3c68bc6d0c8e3f0f77a", "versionType": "git"}, {"status": "affected", "version": "ebe98f1447bbccf8228335c62d86af02a0ed23f7", "lessThan": "c4b9edd55987384a1f201d3d07ff71e448d79c1b", "versionType": "git"}, {"status": "affected", "version": "ebe98f1447bbccf8228335c62d86af02a0ed23f7", "lessThan": "4cfa4c37dcbcfd70866e856200ed8a2894cac578", "versionType": "git"}, {"status": "affected", "version": "ebe98f1447bbccf8228335c62d86af02a0ed23f7", "lessThan": "ec306600d5ba7148c9dbf8f5a8f1f5c1a044a241", "versionType": "git"}], "programFiles": ["fs/smb/client/cached_dir.h"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.1"}, {"status": "unaffected", "version": "0", "lessThan": "6.1", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.164", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.125", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.72", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.11", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.1", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/client/cached_dir.h"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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\u2013modify\u2013write\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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.164", "versionStartIncluding": "6.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.125", "versionStartIncluding": "6.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.72", "versionStartIncluding": "6.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.11", "versionStartIncluding": "6.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.1", "versionStartIncluding": "6.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "6.1"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:20:46.650Z"}}}, "cveMetadata": {"cveId": "CVE-2026-23230", "state": "PUBLISHED", "dateUpdated": "2026-10-19T18:35:39.300Z", "dateReserved": "2026-01-13T15:37:45.988Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-02-18T14:53:34.078Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Bitfield assignments generate byte read\u2013modify\u2013write\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."}, {"lang": "es", "value": "Se ha resuelto la siguiente vulnerabilidad en el kernel de Linux:\n\nsmb: cliente: dividir los campos de bits de cached_fid para evitar condiciones de carrera RMW de bytes compartidos\n\nis_open, has_lease y on_list se almacenan en el mismo byte de campo de bits en la estructura cached_fid, pero se actualizan en diferentes rutas de c\u00f3digo que pueden ejecutarse concurrentemente. Las asignaciones de campos de bits generan operaciones de lectura-modificaci\u00f3n-escritura de bytes (p. ej., 'orb $mask, addr' en x86_64), por lo que al actualizar una bandera (flag) se puede restaurar valores obsoletos de las otras.\n\nUna posible intercalaci\u00f3n es:\n CPU1: carga el byte antiguo (has_lease=1, on_list=1)\n CPU2: borra ambas banderas (almacena 0)\n CPU1: almacena RMW (old | IS_OPEN) -> reintroduce los bits borrados\n\nPara evitar esta clase de condiciones de carrera, hay que convertir estas banderas a campos bool separados."}], "id": "CVE-2026-23230", "lastModified": "2026-10-19T19:17:42.580", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23230", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:06:47.736511Z", "version": "2.0.3"}}]}, "published": "2026-02-18T16:22:32.807", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3eaa22d688311c708b73f3c68bc6d0c8e3f0f77a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4386f6af8aaedd0c5ad6f659b40cadcc8f423828"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4cfa4c37dcbcfd70866e856200ed8a2894cac578"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/569fecc56bfe4df66f05734d67daef887746656b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c4b9edd55987384a1f201d3d07ff71e448d79c1b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ec306600d5ba7148c9dbf8f5a8f1f5c1a044a241"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-253495.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: smb: client: split cached_fid bitfields to avoid shared-byte RMW races", "id": "2440658", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2440658"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-23230", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-02-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23230\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23230\nhttps://lore.kernel.org/linux-cve-announce/2026021808-CVE-2026-23230-8d0e@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,4386f6af8aaedd0c5ad6f659b40cadcc8f423828)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,3eaa22d688311c708b73f3c68bc6d0c8e3f0f77a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,c4b9edd55987384a1f201d3d07ff71e448d79c1b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,4cfa4c37dcbcfd70866e856200ed8a2894cac578)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.125,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.72,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.11,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.1,6.20.0)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "analysis": {"en": {"generated_at": "2026-04-15T17:03:20.682468+00:00", "value": {"mitigation_remediation": ["Apply the kernel patch that splits the cached_fid bitfield into separate boolean fields, as provided in the commit referenced by the CVE advisory.", "If an immediate kernel update is not feasible, disable or restrict SMB client usage on the affected systems until the patch is applied to prevent the race condition from being triggered.", "When a kernel upgrade cannot be performed immediately, isolate impacted workloads from external SMB traffic and monitor for anomalous SMB activity until the patch is applied."], "summary": {"action": "Immediate Patch", "impact": "Data corruption and potential denial of service within the Linux SMB client"}, "threat_synthesis": {"affected_systems": "All Linux kernel releases that include the unpatched SMB client implementation. No specific version range is listed, but any kernel that has not incorporated the latest commit that splits the bitfields into individual boolean members is vulnerable.", "description_and_impact": "The flaw arises from storing several flag bits in a single byte of the cached_fid structure within the Linux SMB client. Concurrent code paths modify these bits separately, causing read\u2011modify\u2011write races that can inadvertently restore stale flag values. This race can leave the SMB client in an incorrect, inconsistent state, leading to data corruption, service interruption, or loss of synchronization with the SMB server.", "risk_and_exploitability": "The CVSS score of 8.8 indicates a high severity vulnerability. The EPSS score is below 1%, suggesting low current exploitation probability, and the vulnerability is not listed in the CISA KEV catalog. Exploitation requires concurrent execution of the conflicting code paths in the SMB client, typically achievable by a local user with permissions to run SMB client operations. While it does not provide arbitrary code execution, the race condition can disrupt client operations and degrade service availability."}}}}, "created": "2026-02-19T10:11:42.585294+00:00", "updated": "2026-04-15T17:15:10.606573+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-362"]}