CVE-2026-93811

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-93811", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-18T17:59:28.790Z", "datePublished": "2026-09-24T16:02:47.745Z", "dateUpdated": "2026-10-03T10:57:43.607Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-03T10:57:43.607Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling\n\n1. When ndr_decode_v4_ntacl() fails, the code jumped to free_n_data\n which only freed n.data, skipping kfree(acl.sd_buf) and leaking\n the buffer. Zero-initialize struct xattr_ntacl acl, reorder error\n labels to out_free to release acl.sd_buf on all error paths.\n\n2. if (acl.sd_size < sizeof(struct smb_ntsd)) is true, original code\n returned success without freeing sd_buf and left stale *pntsd.\n Set rc = -EINVAL before jumping to out_free to return error code and\n free buffer."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/vfs.c"], "versions": [{"version": "cb69d4d6f709f87c94afa28ae64c501576692171", "lessThan": "f46a70a082bdbfecbe074af8a719c26c4deb58c6", "status": "affected", "versionType": "git"}, {"version": "8f0541186e9ad1b62accc9519cc2b7a7240272a7", "lessThan": "86c2625fb9863139b359805fc6be1e31edbd3d65", "status": "affected", "versionType": "git"}, {"version": "8f0541186e9ad1b62accc9519cc2b7a7240272a7", "lessThan": "edc17db83085624a2b1bacf6a4521d7f15571737", "status": "affected", "versionType": "git"}, {"version": "8f0541186e9ad1b62accc9519cc2b7a7240272a7", "lessThan": "c3836f55e0dab96314774215e12d87f63fa919f2", "status": "affected", "versionType": "git"}, {"version": "8f0541186e9ad1b62accc9519cc2b7a7240272a7", "lessThan": "6e6329322ad733c5b23555c609353841560b26bc", "status": "affected", "versionType": "git"}, {"version": "8f0541186e9ad1b62accc9519cc2b7a7240272a7", "lessThan": "d708a36634bb7b6f94d0e76d587d2ec50b2b93b5", "status": "affected", "versionType": "git"}, {"version": "6e8f4abf584253cbaa596ea4ad13110cf61cd4c9", "status": "affected", "versionType": "git"}, {"version": "8e33102309bd6839b2e2e158f93a7b378cb4655d", "status": "affected", "versionType": "git"}, {"version": "5.15.62", "lessThan": "5.15.222", "status": "affected", "versionType": "semver"}, {"version": "5.18.18", "lessThan": "5.19", "status": "affected", "versionType": "semver"}, {"version": "5.19.2", "lessThan": "5.20", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/vfs.c"], "versions": [{"version": "6.0", "status": "affected"}, {"version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "5.15.62", "versionEndExcluding": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18.18"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f46a70a082bdbfecbe074af8a719c26c4deb58c6"}, {"url": "https://git.kernel.org/stable/c/86c2625fb9863139b359805fc6be1e31edbd3d65"}, {"url": "https://git.kernel.org/stable/c/edc17db83085624a2b1bacf6a4521d7f15571737"}, {"url": "https://git.kernel.org/stable/c/c3836f55e0dab96314774215e12d87f63fa919f2"}, {"url": "https://git.kernel.org/stable/c/6e6329322ad733c5b23555c609353841560b26bc"}, {"url": "https://git.kernel.org/stable/c/d708a36634bb7b6f94d0e76d587d2ec50b2b93b5"}], "title": "ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/server/vfs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "f46a70a082bdbfecbe074af8a719c26c4deb58c6", "status": "affected", "version": "cb69d4d6f709f87c94afa28ae64c501576692171", "versionType": "git"}, {"lessThan": "86c2625fb9863139b359805fc6be1e31edbd3d65", "status": "affected", "version": "8f0541186e9ad1b62accc9519cc2b7a7240272a7", "versionType": "git"}, {"lessThan": "edc17db83085624a2b1bacf6a4521d7f15571737", "status": "affected", "version": "8f0541186e9ad1b62accc9519cc2b7a7240272a7", "versionType": "git"}, {"lessThan": "c3836f55e0dab96314774215e12d87f63fa919f2", "status": "affected", "version": "8f0541186e9ad1b62accc9519cc2b7a7240272a7", "versionType": "git"}, {"lessThan": "6e6329322ad733c5b23555c609353841560b26bc", "status": "affected", "version": "8f0541186e9ad1b62accc9519cc2b7a7240272a7", "versionType": "git"}, {"lessThan": "d708a36634bb7b6f94d0e76d587d2ec50b2b93b5", "status": "affected", "version": "8f0541186e9ad1b62accc9519cc2b7a7240272a7", "versionType": "git"}, {"status": "affected", "version": "6e8f4abf584253cbaa596ea4ad13110cf61cd4c9", "versionType": "git"}, {"status": "affected", "version": "8e33102309bd6839b2e2e158f93a7b378cb4655d", "versionType": "git"}, {"lessThan": "5.15.222", "status": "affected", "version": "5.15.62", "versionType": "semver"}, {"lessThan": "5.19", "status": "affected", "version": "5.18.18", "versionType": "semver"}, {"lessThan": "5.20", "status": "affected", "version": "5.19.2", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/server/vfs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.0"}, {"lessThan": "6.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.222", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling\n\n1. When ndr_decode_v4_ntacl() fails, the code jumped to free_n_data\n which only freed n.data, skipping kfree(acl.sd_buf) and leaking\n the buffer. Zero-initialize struct xattr_ntacl acl, reorder error\n labels to out_free to release acl.sd_buf on all error paths.\n\n2. if (acl.sd_size < sizeof(struct smb_ntsd)) is true, original code\n returned success without freeing sd_buf and left stale *pntsd.\n Set rc = -EINVAL before jumping to out_free to return error code and\n free buffer."}], "id": "CVE-2026-93811", "lastModified": "2026-10-03T11:17:50.870", "metrics": {}, "published": "2026-09-24T17:17:14.550", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6e6329322ad733c5b23555c609353841560b26bc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/86c2625fb9863139b359805fc6be1e31edbd3d65"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c3836f55e0dab96314774215e12d87f63fa919f2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d708a36634bb7b6f94d0e76d587d2ec50b2b93b5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/edc17db83085624a2b1bacf6a4521d7f15571737"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f46a70a082bdbfecbe074af8a719c26c4deb58c6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling", "id": "2540558", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2540558"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-772", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling\n1. When ndr_decode_v4_ntacl() fails, the code jumped to free_n_data\nwhich only freed n.data, skipping kfree(acl.sd_buf) and leaking\nthe buffer. Zero-initialize struct xattr_ntacl acl, reorder error\nlabels to out_free to release acl.sd_buf on all error paths.\n2. if (acl.sd_size < sizeof(struct smb_ntsd)) is true, original code\nreturned success without freeing sd_buf and left stale *pntsd.\nSet rc = -EINVAL before jumping to out_free to return error code and\nfree buffer.", "A flaw was found in the Linux kernel's ksmbd Server Message Block (SMB) server. When processing access control list (ACL) data, error-handling routines fail to release memory buffers if decoding fails or if an invalid security descriptor size is encountered. A remote attacker could exploit this vulnerability by repeatedly triggering these error paths, causing memory leaks that may lead to system resource exhaustion and a denial of service (DoS)."], "name": "CVE-2026-93811", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-93811\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-93811\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93811.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,c3836f55e0dab96314774215e12d87f63fa919f2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,6e6329322ad733c5b23555c609353841560b26bc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,d708a36634bb7b6f94d0e76d587d2ec50b2b93b5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.12.111)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.53)"}}], "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": "[6.12.111,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "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"}], "created": "2026-09-24T20:30:17.879560+00:00", "updated": "2026-10-01T20:15:12.377640+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}