{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-2340", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-02-11T12:29:16.340Z", "datePublished": "2026-05-27T12:09:32.601Z", "dateUpdated": "2026-09-03T14:24:56.303Z" }, "containers": { "cna": { "title": "Samba: vfs_worm does not block directory modification", "metrics": [ { "other": { "content": { "value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "version": "3.1" }, "format": "CVSS" } ], "descriptions": [ { "lang": "en", "value": "A flaw was found in Samba’s vfs_worm module. The module is intended to provide write-once, read-many (WORM) protections by preventing modification of files after a configurable grace period. Due to insufficient validation during rename operations, an authenticated user with write access to a share could overwrite a protected file by renaming a newly created file over the existing WORM-protected file." } ], "affected": [ { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "samba", "defaultStatus": "affected", "versions": [ { "version": "0:4.23.5-109.el10_2", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "cpes": [ "cpe:/o:redhat:enterprise_linux:10.2" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10.0 Extended Update Support", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "samba", "defaultStatus": "affected", "versions": [ { "version": "0:4.21.3-114.el10_0.1", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "cpes": [ "cpe:/o:redhat:enterprise_linux_eus:10.0" ] 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"cpe:/o:redhat:rhel_eus_long_life:8.6::baseos" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "samba", "defaultStatus": "affected", "versions": [ { "version": "0:4.17.5-7.el8_8.1", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "cpes": [ "cpe:/a:redhat:rhel_e4s:8.8::appstream", "cpe:/a:redhat:rhel_tus:8.8::appstream", "cpe:/o:redhat:rhel_e4s:8.8::baseos", "cpe:/o:redhat:rhel_tus:8.8::baseos" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "samba", "defaultStatus": "affected", "versions": [ { "version": "0:4.17.5-7.el8_8.1", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "cpes": [ "cpe:/a:redhat:rhel_e4s:8.8::appstream", 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"cpe:/a:redhat:enterprise_linux:9::appstream", "cpe:/a:redhat:enterprise_linux:9::crb", "cpe:/a:redhat:enterprise_linux:9::resilientstorage", "cpe:/o:redhat:enterprise_linux:9::baseos" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "samba", "defaultStatus": "affected", "versions": [ { "version": "0:4.17.5-105.el9_2.5", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "cpes": [ "cpe:/a:redhat:rhel_e4s:9.2::appstream", "cpe:/a:redhat:rhel_e4s:9.2::resilientstorage", "cpe:/o:redhat:rhel_e4s:9.2::baseos" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "samba", "defaultStatus": "affected", "versions": [ { "version": "0:4.19.4-105.el9_4.4", "lessThan": "*", "versionType": 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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "samba", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:7" ] }, { "vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "openshift/ose-rhel-coreos-8", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:openshift:4" ] } ], "references": [ { "url": "https://access.redhat.com/errata/RHSA-2026:22644", "name": "RHSA-2026:22644", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:22963", "name": "RHSA-2026:22963", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:25049", "name": "RHSA-2026:25049", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:25979", "name": "RHSA-2026:25979", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:28053", "name": "RHSA-2026:28053", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:28054", "name": "RHSA-2026:28054", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:28055", "name": "RHSA-2026:28055", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:28056", "name": "RHSA-2026:28056", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:28057", "name": "RHSA-2026:28057", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:29863", "name": "RHSA-2026:29863", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:56786", "name": "RHSA-2026:56786", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:56853", "name": "RHSA-2026:56853", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:56911", "name": "RHSA-2026:56911", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:57483", "name": "RHSA-2026:57483", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:59831", "name": "RHSA-2026:59831", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:60019", "name": "RHSA-2026:60019", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/security/cve/CVE-2026-2340", "tags": [ "vdb-entry", "x_refsource_REDHAT" ] }, { "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2447318", "name": "RHBZ#2447318", "tags": [ "issue-tracking", "x_refsource_REDHAT" ] }, { "url": "https://bugzilla.samba.org/show_bug.cgi?id=15997" } ], "datePublic": "2026-05-27T10:35:47.805Z", "problemTypes": [ { "descriptions": [ { "cweId": "CWE-280", "description": "Improper Handling of Insufficient Permissions or Privileges", "lang": "en", "type": "CWE" } ] } ], "x_redhatCweChain": "CWE-280: Improper Handling of Insufficient Permissions or Privileges", "workarounds": [ { "lang": "en", "value": "Administrators can mitigate this issue by:\n\nSetting read-only permissions on protected files at the underlying filesystem level will prevent modifications.\n\nConfiguring ```worm:grace_period = 0``` (zero or less) in smb.conf will eliminate the writable grace period (will eliminate the window in which the rename can happen), understanding that this may impact workflows requiring multi-step file creation." } ], "timeline": [ { "lang": "en", "time": "2026-03-13T12:55:04.465Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-05-27T10:35:47.805Z", "value": "Made public." } ], "credits": [ { "lang": "en", "value": "Red Hat would like to thank Pavel Kohout (Aisle Research) for reporting this issue." } ], "providerMetadata": { "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-09-03T14:24:56.303Z" }, "x_generator": { "engine": "cvelib 1.8.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-05-29T15:35:51.156381Z", "id": "CVE-2026-2340", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-29T15:35:58.406Z" } } ] } }