CVE-2026-98405
Received
Received - Intake
Buffer Overflow in Linux Kernel SMB Client
Vulnerability report for CVE-2026-98405, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-14
Last updated on: 2026-10-14
Assigner: kernel.org
Description
Description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix missing iov bounds check in parse_posix_sids()
In parse_posix_sids(), sidsbuf_end is calculated using the server-supplied
out_len without being validated against the actual length of the received
iov (iov_len).
If a server provides an inflated out_len, sidsbuf_end will point past the
end of the iov. This defeats the bounds guards in posix_info_sid_size(),
allowing out-of-bounds reads into adjacent kernel memory.
Fix this by rejecting responses where the calculated sidsbuf_end would
exceed the received iov boundaries or cause pointer wraparound.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | a90f37e3d7acfd9824f162830583bbf7846fe252 |
| Linux | Linux | a90f37e3d7acfd9824f162830583bbf7846fe252 |
| Linux | Linux | a90f37e3d7acfd9824f162830583bbf7846fe252 |
| Linux | Linux | a90f37e3d7acfd9824f162830583bbf7846fe252 |
| Linux | Linux | a90f37e3d7acfd9824f162830583bbf7846fe252 |
| Linux | Linux | 6.6.32 |
| Linux | Linux | 6.6.32 |
| Linux | Linux | 6.6.32 |
| Linux | Linux | 6.6.32 |
| Linux | Linux | 6.6.32 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
