Out-of-bounds read in Linux kernel - CVE-2026-97563
Published: September 28, 2026
Vulnerability identifier: #VU152652
CSH Severity: Medium
CVSS v4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-97563
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose kernel heap information or cause a denial of service.
The vulnerability exists due to insufficient validation of DataOffset in the CIFSSMBRead() SMB1 synchronous read helper when processing a crafted SMB1 read response. A remote attacker can return a response with a large DataOffset to read beyond the received response buffer and disclose adjacent kernel heap memory or trigger an oops.
Exploitation requires an explicitly configured SMB1 mount using vers=1.0, because SMB1 is not negotiated by default.
Affected software
Linux kernel
How to mitigate CVE-2026-97563
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3