CVE-2026-64257
critical · 9.1In the Linux kernel, the following vulnerability has been resolved: smb: client: reject overlapping data areas in SMB2 responses Commit 53b7c271f06b ("smb: client: restrict implied bcc[0] exemption to responses without data area") restricted the implied bcc[0] length exception to responses without a data area. However, the overlap handling in __smb2_calc_size() clears data_length, which can make an invalid response appear to have no data area and so qualify for the exception. Track data area overlap separately and reject such responses before applying the length compatibility exceptions.
9.1
CVSS
0.7%
EPSS (exploit prob.)
50th
EPSS percentile
2026-07-25
Published
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| linux | linux_kernel | >= 5.10.261, < 5.11 |
| linux | linux_kernel | >= 5.15.212, < 5.16 |
| linux | linux_kernel | 7.2 |
Check a specific version with /api/v1/cve/match.
References
- https://git.kernel.org/stable/c/36bfa52459e45c0d5b668de2f1c91f6dc5c67775
- https://git.kernel.org/stable/c/445ece263131780dee273d727a4d6f11934feec7
- https://git.kernel.org/stable/c/4a9d2657d3e05f6ed09c148cb127b4e58702275f
- https://git.kernel.org/stable/c/57cba95f0e97c6f6e45e6731da30aff091bd7460
- https://git.kernel.org/stable/c/8986c932905ea508d66da421eb2eb6e676ace1fe
- https://git.kernel.org/stable/c/fdafa1e68dc75045b7b617e6e7d2854950804d83
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2026-64257