Out-of-bounds write in Linux kernel - CVE-2026-64552
Published: July 28, 2026
Vulnerability identifier: #VU139815
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64552
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause memory corruption.
The vulnerability exists due to an out-of-bounds write in receive_big() when processing a device-announced packet length from a virtio backend. A remote attacker can announce a specially crafted length value to cause memory corruption.
The issue can result in a NULL fragment being handed up the receive path.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-64552
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.100-1
linux (Debian package) - update to 6.12.100-1
External References
- https://git.kernel.org/stable/c/38e94d63e29f4a5c6eae87ee2c02101aaa321502
- https://git.kernel.org/stable/c/9e5ad06ea826322ce8c58b4a68442a96f600c3c4
- https://git.kernel.org/stable/c/c7fc9adf4e006155f7f2aeda052fbcde25cdcc49
- https://git.kernel.org/stable/c/e6b8463b7d791f3886d7584259d6e9f06a69f12e
- https://git.kernel.org/stable/c/f9451d0fd5ba635dcabb49bfe456a6db734a8986
- https://git.kernel.org/stable/c/fbeb65154583879d556ea94cb2f15888e9470f3d