Kernel memory disclosure via create-context DataOffset validation
Published Nov 14, 2024 · Updated Nov 14, 2024
Out-of-bounds read in the Linux kernel ksmbd module allows remote attackers to disclose kernel memory through a crafted SMB2 open request. smb2_find_context_vals in fs/ksmbd/oplock.c fails to reject a zero DataOffset while validating the DataBuffer against the create-context tag length, permitting an out-of-bounds read. Only hosts with ksmbd enabled are exposed, and SMB authentication requirements depend on configuration; the documented standalone effect is kernel-memory disclosure.
Summary
What happened
Out-of-bounds read in the Linux kernel ksmbd module allows remote attackers to disclose kernel memory through a crafted SMB2 open request. smb2_find_context_vals in fs/ksmbd/oplock.c fails to reject a zero DataOffset while validating the DataBuffer against the create-context tag length, permitting an out-of-bounds read. Only hosts with ksmbd enabled are exposed, and SMB authentication requirements depend on configuration; the documented standalone effect is kernel-memory disclosure.
The record
- CVE
- CVE-2023-4458
- Published
- Nov 14, 2024
- Updated
- Nov 14, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-125, T1210
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 14, 2024CVE publishedPublication date reported by the CVE source.
- Nov 14, 2024Record updatedLatest update available in the CVE record.
Exploitability
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