cbcvebase.
CVE-2025-38407
published 2025-07-25

CVE-2025-38407: In the Linux kernel, the following vulnerability has been resolved: riscv: cpu_ops_sbi: Use static array for boot_data Since commit 6b9f29b81b15 ("riscv…

PriorityP422medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.15%
5.0th percentile
In the Linux kernel, the following vulnerability has been resolved: riscv: cpu_ops_sbi: Use static array for boot_data Since commit 6b9f29b81b15 ("riscv: Enable pcpu page first chunk allocator"), if NUMA is enabled, the page percpu allocator may be used on very sparse configurations, or when requested on boot with percpu_alloc=page. In that case, percpu data gets put in the vmalloc area. However, sbi_hsm_hart_start() needs the physical address of a sbi_hart_boot_data, and simply assumes that __pa() would work. This causes the just started hart to immediately access an invalid address and hang. Fortunately, struct sbi_hart_boot_data is not too large, so we can simply allocate an array for boot_data statically, putting it in the kernel image. This fixes NUMA=y SMP boot on Sophgo SG2042. To reproduce on QEMU: Set CONFIG_NUMA=y and CONFIG_DEBUG_VIRTUAL=y, then run with: qemu-system-riscv64 -M virt -smp 2 -nographic \ -kernel arch/riscv/boot/Image \ -append "percpu_alloc=page" Kernel output: [ 0.000000] Booting Linux on hartid 0 [ 0.000000] Linux version 6.16.0-rc1 (dram@sakuya) (riscv64-unknown-linux-gnu-gcc (GCC) 14.2.1 20250322, GNU ld (GNU Binutils) 2.44) #11 SMP Tue Jun 24 14:56:22 CST 2025 ... [ 0.000000] percpu: 28 4K pages/cpu s85784 r8192 d20712 ... [ 0.083192] smp: Bringing up secondary CPUs ... [ 0.086722] ------------[ cut here ]------------ [ 0.086849] virt_to_phys used for non-linear address: (____ptrval____) (0xff2000000001d080) [ 0.088001] WARNING: CPU: 0 PID: 1 at arch/riscv/mm/physaddr.c:14 __virt_to_phys+0xae/0xe8 [ 0.088376] Modules linked in: [ 0.088656] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.16.0-rc1 #11 NONE [ 0.088833] Hardware name: riscv-virtio,qemu (DT) [ 0.088948] epc : __virt_to_phys+0xae/0xe8 [ 0.089001] ra : __virt_to_phys+0xae/0xe8 [ 0.089037] epc : ffffffff80021eaa ra : ffffffff80021eaa sp : ff2000000004bbc0 [ 0.089057] gp : ffffffff817f49c0 tp : ff60000001d60000 t0 : 5f6f745f74726976 [ 0.089076] t1 : 0000000000000076

Affected

20 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.12.37-1 (forky)linux 6.12.37-1 (forky)
linuxlinux
linuxlinux>= 6b9f29b81b155af023da95f560f738f29722b306 < f5fe094f35a37adea40b2fd52c99bb1333be9b07f5fe094f35a37adea40b2fd52c99bb1333be9b07
linuxlinux>= 6b9f29b81b155af023da95f560f738f29722b306 < 02c725cd55eb5052b88eeaa3f60a391ef4dcaec502c725cd55eb5052b88eeaa3f60a391ef4dcaec5
linuxlinux>= 6b9f29b81b155af023da95f560f738f29722b306 < 2b29be967ae456fc09c320d91d52278cf721be1e2b29be967ae456fc09c320d91d52278cf721be1e
linuxlinux_kernel
linuxlinux_kernel>= 0 < 6.12.37-16.12.37-1
linuxlinux_kernel>= 0 < 6.12.37-16.12.37-1
linuxlinux_kernel>= 0 < 6.8.0-100.1006.8.0-100.100
linuxlinux_kernel>= 6.13 < 6.15.66.15.6
linuxlinux_kernel>= 6.8 < 6.12.376.12.37
ubuntulinux-aws
ubuntulinux-aws-6.8
ubuntulinux-gkeop
ubuntulinux-nvidia
ubuntulinux-nvidia-6.8
ubuntulinux-oracle
ubuntulinux-oracle-6.8
ubuntulinux-raspi-realtime
ubuntulinux-realtime

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.6MEDIUM
vendor_ubuntu5.6MEDIUM
vendor_debian5.5LOW
vendor_redhat5.5MEDIUM
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