CVE-2026-46139
- Source
- https://cve.org/CVERecord?id=CVE-2026-46139
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46139.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-46139
- Downstream
- Related
- Published
- 2026-05-28T09:35:55Z
- Modified
- 2026-10-08T02:50:56Z
- Summary
- smb: client: use kzalloc to zero-initialize security descriptor buffer
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
smb: client: use kzalloc to zero-initialize security descriptor buffer
Commit 62e7dd0a39c2d ("smb: common: change the data type of num_aces to le16") split struct smb_acl's __le32 num_aces field into __le16 num_aces and __le16 reserved. The reserved field corresponds to Sbz2 in the MS-DTYP ACL wire format, which must be zero [1].
When building an ACL descriptor in build_sec_desc(), we are using a kmalloc()'ed descriptor buffer and writing the fields explicitly using le16() writes now. This never writes to the 2 byte reserved field, leaving it as uninitialized heap data.
When the reserved field happens to contain non-zero slab garbage, Samba rejects the security descriptor with "ndr_pull_security_descriptor failed: Range Error", causing chmod to fail with EINVAL.
Change kmalloc() to kzalloc() to ensure the entire buffer is zero-initialized.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46139.json" }- References
-
- https://git.kernel.org/stable/c/4c3ed344a970aad51388ac3b0145b98318f0e21f
- https://git.kernel.org/stable/c/5e489c6c47a2ac15edbaca153b9348e42c1eacab
- https://git.kernel.org/stable/c/941a1e6eb35440336913afc88a82103291956d5d
- https://git.kernel.org/stable/c/9bdb2ca31368b7671949dfb94a5d57ffccd01edd
- https://git.kernel.org/stable/c/be1ef9512a3f5a755895c24f31b334342f4aa15b
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46139.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-46139
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced1593ddb37bd124c131fe635397df68e854a03108Fixed4c3ed344a970aad51388ac3b0145b98318f0e21f
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedda087905e3270e2291c0afae39a28e7d183e5ec3Fixed941a1e6eb35440336913afc88a82103291956d5d
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0dFixedbe1ef9512a3f5a755895c24f31b334342f4aa15bFixed9bdb2ca31368b7671949dfb94a5d57ffccd01eddFixed5e489c6c47a2ac15edbaca153b9348e42c1eacab
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.12.23Fixed6.12.88
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.13.11Fixed6.14
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced191f2f444745087c3c51fd6042a0e25f42315ab0