{"api_version":"1","generated_at":"2026-06-02T00:14:11+00:00","cve":"CVE-2026-46139","urls":{"html":"https://cve.report/CVE-2026-46139","api":"https://cve.report/api/cve/CVE-2026-46139.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-46139","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-46139"},"summary":{"title":"smb: client: use kzalloc to zero-initialize security descriptor buffer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: use kzalloc to zero-initialize security descriptor buffer\n\nCommit 62e7dd0a39c2d (\"smb: common: change the data type of num_aces\nto le16\") split struct smb_acl's __le32 num_aces field into __le16\nnum_aces and __le16 reserved. The reserved field corresponds to Sbz2\nin the MS-DTYP ACL wire format, which must be zero [1].\n\nWhen building an ACL descriptor in build_sec_desc(), we are using a\nkmalloc()'ed descriptor buffer and writing the fields explicitly using\nle16() writes now. This never writes to the 2 byte reserved field,\nleaving it as uninitialized heap data.\n\nWhen the reserved field happens to contain non-zero slab garbage,\nSamba rejects the security descriptor with \"ndr_pull_security_descriptor\nfailed: Range Error\", causing chmod to fail with EINVAL.\n\nChange kmalloc() to kzalloc() to ensure the entire buffer is\nzero-initialized.\n\n\n[1] https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-dtyp/20233ed8-a6c6-4097-aafa-dd545ed24428","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-28 10:16:29","updated_at":"2026-05-28 13:44:01"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/941a1e6eb35440336913afc88a82103291956d5d","name":"https://git.kernel.org/stable/c/941a1e6eb35440336913afc88a82103291956d5d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/be1ef9512a3f5a755895c24f31b334342f4aa15b","name":"https://git.kernel.org/stable/c/be1ef9512a3f5a755895c24f31b334342f4aa15b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9bdb2ca31368b7671949dfb94a5d57ffccd01edd","name":"https://git.kernel.org/stable/c/9bdb2ca31368b7671949dfb94a5d57ffccd01edd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5e489c6c47a2ac15edbaca153b9348e42c1eacab","name":"https://git.kernel.org/stable/c/5e489c6c47a2ac15edbaca153b9348e42c1eacab","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4c3ed344a970aad51388ac3b0145b98318f0e21f","name":"https://git.kernel.org/stable/c/4c3ed344a970aad51388ac3b0145b98318f0e21f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46139","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46139","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1593ddb37bd124c131fe635397df68e854a03108 4c3ed344a970aad51388ac3b0145b98318f0e21f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected da087905e3270e2291c0afae39a28e7d183e5ec3 941a1e6eb35440336913afc88a82103291956d5d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0d be1ef9512a3f5a755895c24f31b334342f4aa15b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0d 9bdb2ca31368b7671949dfb94a5d57ffccd01edd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0d 5e489c6c47a2ac15edbaca153b9348e42c1eacab git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 191f2f444745087c3c51fd6042a0e25f42315ab0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.23 6.12.88 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.13.11 6.14 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.14","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.14 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.88 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.30 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.7 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"46139","cve":"CVE-2026-46139","epss":"0.000180000","percentile":"0.050770000","score_date":"2026-06-01","updated_at":"2026-06-02 00:05:20"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/client/cifsacl.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"4c3ed344a970aad51388ac3b0145b98318f0e21f","status":"affected","version":"1593ddb37bd124c131fe635397df68e854a03108","versionType":"git"},{"lessThan":"941a1e6eb35440336913afc88a82103291956d5d","status":"affected","version":"da087905e3270e2291c0afae39a28e7d183e5ec3","versionType":"git"},{"lessThan":"be1ef9512a3f5a755895c24f31b334342f4aa15b","status":"affected","version":"62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0d","versionType":"git"},{"lessThan":"9bdb2ca31368b7671949dfb94a5d57ffccd01edd","status":"affected","version":"62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0d","versionType":"git"},{"lessThan":"5e489c6c47a2ac15edbaca153b9348e42c1eacab","status":"affected","version":"62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0d","versionType":"git"},{"status":"affected","version":"191f2f444745087c3c51fd6042a0e25f42315ab0","versionType":"git"},{"lessThan":"6.12.88","status":"affected","version":"6.12.23","versionType":"semver"},{"lessThan":"6.14","status":"affected","version":"6.13.11","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/smb/client/cifsacl.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.14"},{"lessThan":"6.14","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.88","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.30","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.88","versionStartIncluding":"6.12.23","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.30","versionStartIncluding":"6.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.7","versionStartIncluding":"6.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1-rc3","versionStartIncluding":"6.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13.11","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: use kzalloc to zero-initialize security descriptor buffer\n\nCommit 62e7dd0a39c2d (\"smb: common: change the data type of num_aces\nto le16\") split struct smb_acl's __le32 num_aces field into __le16\nnum_aces and __le16 reserved. The reserved field corresponds to Sbz2\nin the MS-DTYP ACL wire format, which must be zero [1].\n\nWhen building an ACL descriptor in build_sec_desc(), we are using a\nkmalloc()'ed descriptor buffer and writing the fields explicitly using\nle16() writes now. This never writes to the 2 byte reserved field,\nleaving it as uninitialized heap data.\n\nWhen the reserved field happens to contain non-zero slab garbage,\nSamba rejects the security descriptor with \"ndr_pull_security_descriptor\nfailed: Range Error\", causing chmod to fail with EINVAL.\n\nChange kmalloc() to kzalloc() to ensure the entire buffer is\nzero-initialized.\n\n\n[1] https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-dtyp/20233ed8-a6c6-4097-aafa-dd545ed24428"}],"providerMetadata":{"dateUpdated":"2026-05-28T09:35:55.234Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/4c3ed344a970aad51388ac3b0145b98318f0e21f"},{"url":"https://git.kernel.org/stable/c/941a1e6eb35440336913afc88a82103291956d5d"},{"url":"https://git.kernel.org/stable/c/be1ef9512a3f5a755895c24f31b334342f4aa15b"},{"url":"https://git.kernel.org/stable/c/9bdb2ca31368b7671949dfb94a5d57ffccd01edd"},{"url":"https://git.kernel.org/stable/c/5e489c6c47a2ac15edbaca153b9348e42c1eacab"}],"title":"smb: client: use kzalloc to zero-initialize security descriptor buffer","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-46139","datePublished":"2026-05-28T09:35:55.234Z","dateReserved":"2026-05-13T15:03:33.100Z","dateUpdated":"2026-05-28T09:35:55.234Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-28 10:16:29","lastModifiedDate":"2026-05-28 13:44:01","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"46139","Ordinal":"1","Title":"smb: client: use kzalloc to zero-initialize security descriptor ","CVE":"CVE-2026-46139","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"46139","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: use kzalloc to zero-initialize security descriptor buffer\n\nCommit 62e7dd0a39c2d (\"smb: common: change the data type of num_aces\nto le16\") split struct smb_acl's __le32 num_aces field into __le16\nnum_aces and __le16 reserved. The reserved field corresponds to Sbz2\nin the MS-DTYP ACL wire format, which must be zero [1].\n\nWhen building an ACL descriptor in build_sec_desc(), we are using a\nkmalloc()'ed descriptor buffer and writing the fields explicitly using\nle16() writes now. This never writes to the 2 byte reserved field,\nleaving it as uninitialized heap data.\n\nWhen the reserved field happens to contain non-zero slab garbage,\nSamba rejects the security descriptor with \"ndr_pull_security_descriptor\nfailed: Range Error\", causing chmod to fail with EINVAL.\n\nChange kmalloc() to kzalloc() to ensure the entire buffer is\nzero-initialized.\n\n\n[1] https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-dtyp/20233ed8-a6c6-4097-aafa-dd545ed24428","Type":"Description","Title":"smb: client: use kzalloc to zero-initialize security descriptor "}]}}}