{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46139","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-13T15:03:33.100Z","datePublished":"2026-05-28T09:35:55.234Z","dateUpdated":"2026-06-14T17:57:22.559Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-06-14T17:57:22.559Z"},"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"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/cifsacl.c"],"versions":[{"version":"1593ddb37bd124c131fe635397df68e854a03108","lessThan":"4c3ed344a970aad51388ac3b0145b98318f0e21f","status":"affected","versionType":"git"},{"version":"da087905e3270e2291c0afae39a28e7d183e5ec3","lessThan":"941a1e6eb35440336913afc88a82103291956d5d","status":"affected","versionType":"git"},{"version":"62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0d","lessThan":"be1ef9512a3f5a755895c24f31b334342f4aa15b","status":"affected","versionType":"git"},{"version":"62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0d","lessThan":"9bdb2ca31368b7671949dfb94a5d57ffccd01edd","status":"affected","versionType":"git"},{"version":"62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0d","lessThan":"5e489c6c47a2ac15edbaca153b9348e42c1eacab","status":"affected","versionType":"git"},{"version":"191f2f444745087c3c51fd6042a0e25f42315ab0","status":"affected","versionType":"git"},{"version":"6.12.23","lessThan":"6.12.88","status":"affected","versionType":"semver"},{"version":"6.13.11","lessThan":"6.14","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/client/cifsacl.c"],"versions":[{"version":"6.14","status":"affected"},{"version":"0","lessThan":"6.14","status":"unaffected","versionType":"semver"},{"version":"6.12.88","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.30","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.7","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","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":"6.12.23","versionEndExcluding":"6.12.88"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.18.30"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.0.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13.11"}]}]}],"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"}}}}