Out-of-bounds read in Linux kernel - CVE-2026-64351
Published: July 27, 2026
Vulnerability identifier: #VU139627
CSH Severity: Low
CVSS v4: 2.4 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64351
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an attacker with physical access to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in kalmia_rx_fixup() when processing a crafted short bulk-in frame from a USB device. An attacker with physical access can provide malformed frame lengths to disclose sensitive information.
The issue occurs when framing headers are not both present before frame-length subtraction, causing an integer underflow that lets a device-supplied packet length drive buffer access past the end of the rx buffer.
Affected software
Linux kernel
How to mitigate CVE-2026-64351
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/2d04c37ed4e1d0f733ad39ec35b5a5d8818b4f4a
- https://git.kernel.org/stable/c/391706889a5112feafdc0c68db3ecc7ed325d09c
- https://git.kernel.org/stable/c/46ab32870d010e9a057bc5659cea22b7e728ca88
- https://git.kernel.org/stable/c/47b6bcef6e679593d2e86e04ee72c46a4e2f7139
- https://git.kernel.org/stable/c/51e65f1d78457ea4f9513d90ab22c9dccbb35110
- https://git.kernel.org/stable/c/aa4eef2cbb66ea3dfcfc24bdce798dd78a81b54b
- https://git.kernel.org/stable/c/c466097d85d52f3aa200736cb4759e66d4bbf6e3
- https://git.kernel.org/stable/c/e24eb271061db384a3c3ef6f107fe515e68ef222