Description

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

RISC-V: KVM: Don't zero-out PMU snapshot area before freeing data

With the latest Linux-6.11-rc3, the below NULL pointer crash is observed
when SBI PMU snapshot is enabled for the guest and the guest is forcefully
powered-off.

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000508
Oops [#1]
Modules linked in: kvm
CPU: 0 UID: 0 PID: 61 Comm: term-poll Not tainted 6.11.0-rc3-00018-g44d7178dd77a #3
Hardware name: riscv-virtio,qemu (DT)
epc : __kvm_write_guest_page+0x94/0xa6 [kvm]
ra : __kvm_write_guest_page+0x54/0xa6 [kvm]
epc : ffffffff01590e98 ra : ffffffff01590e58 sp : ffff8f80001f39b0
gp : ffffffff81512a60 tp : ffffaf80024872c0 t0 : ffffaf800247e000
t1 : 00000000000007e0 t2 : 0000000000000000 s0 : ffff8f80001f39f0
s1 : 00007fff89ac4000 a0 : ffffffff015dd7e8 a1 : 0000000000000086
a2 : 0000000000000000 a3 : ffffaf8000000000 a4 : ffffaf80024882c0
a5 : 0000000000000000 a6 : ffffaf800328d780 a7 : 00000000000001cc
s2 : ffffaf800197bd00 s3 : 00000000000828c4 s4 : ffffaf800248c000
s5 : ffffaf800247d000 s6 : 0000000000001000 s7 : 0000000000001000
s8 : 0000000000000000 s9 : 00007fff861fd500 s10: 0000000000000001
s11: 0000000000800000 t3 : 00000000000004d3 t4 : 00000000000004d3
t5 : ffffffff814126e0 t6 : ffffffff81412700
status: 0000000200000120 badaddr: 0000000000000508 cause: 000000000000000d
[] __kvm_write_guest_page+0x94/0xa6 [kv...

Classification

CVE ID: CVE-2024-47717

CVSS Base Severity: MEDIUM

CVSS Base Score: 5.5

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.03% (probability of being exploited)

EPSS Percentile: 7.25% (scored less or equal to compared to others)

EPSS Date: 2025-06-02 (when was this score calculated)

Stakeholder-Specific Vulnerability Categorization (SSVC)

SSVC Exploitation: none

SSVC Technical Impact: partial

SSVC Automatable: false

References

https://nvd.nist.gov/vuln/detail/CVE-2024-47717
https://git.kernel.org/stable/c/81aa95fd5bd14ff49617f07fa79a8d1f1cf2ce9a
https://git.kernel.org/stable/c/6d0a5dcfc78bd18f2abb9641f83380135494559b
https://git.kernel.org/stable/c/47d40d93292d9cff8dabb735bed83d930fa03950

Timeline