CVE-2025-39704

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

LoongArch: KVM: Fix stack protector issue in send_ipi_data()

Function kvm_io_bus_read() is called in function send_ipi_data(), buffer

size of parameter *val should be at least 8 bytes. Since some emulation

functions like loongarch_ipi_readl() and kvm_eiointc_read() will write

the buffer *val with 8 bytes signed extension regardless parameter len.

Otherwise there will be buffer overflow issue when CONFIG_STACKPROTECTOR

is enabled. The bug report is shown as follows:

Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: send_ipi_data+0x194/0x1a0 [kvm]

CPU: 11 UID: 107 PID: 2692 Comm: CPU 0/KVM Not tainted 6.17.0-rc1+ #102 PREEMPT(full)

Stack : 9000000005901568 0000000000000000 9000000003af371c 900000013c68c000

900000013c68f850 900000013c68f858 0000000000000000 900000013c68f998

900000013c68f990 900000013c68f990 900000013c68f6c0 fffffffffffdb058

fffffffffffdb0e0 900000013c68

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References