CVE-2026-46139None▾ SunlitIn 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_…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= 1593ddb37bd124c131fe635397df68e854a03108 < 4c3ed344a970aad51388ac3b0145b98318f0e21fLinux >= da087905e3270e2291c0afae39a28e7d183e5ec3 < 941a1e6eb35440336913afc88a82103291956d5dLinux >= 62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0d < be1ef9512a3f5a755895c24f31b334342f4aa15bLinux >= 62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0d < 9bdb2ca31368b7671949dfb94a5d57ffccd01eddLinux >= 62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0d < 5e489c6c47a2ac15edbaca153b9348e42c1eacabLinux 191f2f444745087c3c51fd6042a0e25f42315ab0Linux >= 6.12.23 < 6.12.88Linux >= 6.13.11 < 6.14Linux 6.14Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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