Description (CNA)
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. [1] https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-dtyp/20233ed8-a6c6-4097-aafa-dd545ed24428
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1593ddb37bd124c131fe635397df68e854a03108 before 4c3ed344a970aad51388ac3b0145b98318f0e21f; affected da087905e3270e2291c0afae39a28e7d183e5ec3 before 941a1e6eb35440336913afc88a82103291956d5d; affected 62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0d before be1ef9512a3f5a755895c24f31b334342f4aa15b; affected 62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0d before 9bdb2ca31368b7671949dfb94a5d57ffccd01edd; affected 62e7dd0a39c2d0d7ff03274c36df971f1b3d2d0d before 5e489c6c47a2ac15edbaca153b9348e42c1eacab; affected 191f2f444745087c3c51fd6042a0e25f42315ab0; affected 6.12.23 before 6.12.88; affected 6.13.11 before 6.14 |
| Linux / Linux | affected 6.14; unaffected 0 before 6.14; unaffected 6.12.88 through 6.12.*; unaffected 6.18.30 through 6.18.*; unaffected 7.0.7 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/4c3ed344a970aad51388ac3b0145b98318f0e21f
- https://git.kernel.org/stable/c/941a1e6eb35440336913afc88a82103291956d5d
- https://git.kernel.org/stable/c/be1ef9512a3f5a755895c24f31b334342f4aa15b
- https://git.kernel.org/stable/c/9bdb2ca31368b7671949dfb94a5d57ffccd01edd
- https://git.kernel.org/stable/c/5e489c6c47a2ac15edbaca153b9348e42c1eacab