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CVE-2025-39936

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

crypto: ccp - Always pass in an error pointer to __sev_platform_shutdown_locked()

When

  9770b428b1a2 ("crypto: ccp - Move dev_info/err messages for SEV/SNP init and shutdown")

moved the error messages dumping so that they don't need to be issued by
the callers, it missed the case where __sev_firmware_shutdown() calls
__sev_platform_shutdown_locked() with a NULL argument which leads to
a NULL ptr deref on the shutdown path, during suspend to disk:

  #PF: supervisor read access in kernel mode
  #PF: error_code(0x0000) - not-present page
  PGD 0 P4D 0
  Oops: Oops: 0000 [#1] SMP NOPTI
  CPU: 0 UID: 0 PID: 983 Comm: hib.sh Not tainted 6.17.0-rc4+ #1 PREEMPT(voluntary)
  Hardware name: Supermicro Super Server/H12SSL-i, BIOS 2.5 09/08/2022
  RIP: 0010:__sev_platform_shutdown_locked.cold+0x0/0x21 [ccp]

That rIP is:

  00000000000006fd <__sev_platform_shutdown_locked.cold>:
   6fd:   8b 13                   mov    (%rbx),%edx
   6ff:   48 8b 7d 00             mov    0x0(%rbp),%rdi
   703:   89 c1                   mov    %eax,%ecx

  Code: 74 05 31 ff 41 89 3f 49 8b 3e 89 ea 48 c7 c6 a0 8e 54 a0 41 bf 92 ff ff ff e8 e5 2e 09 e1 c6 05 2a d4 38 00 01 e9 26 af ff ff <8b> 13 48 8b 7d 00 89 c1 48 c7 c6 18 90 54 a0 89 44 24 04 e8 c1 2e
  RSP: 0018:ffffc90005467d00 EFLAGS: 00010282
  RAX: 00000000ffffff92 RBX: 0000000000000000 RCX: 0000000000000000
  			     ^^^^^^^^^^^^^^^^
and %rbx is nice and clean.

  Call Trace:
   <TASK>
   __sev_firmware_shutdown.isra.0
   sev_dev_destroy
   psp_dev_destroy
   sp_destroy
   pci_device_shutdown
   device_shutdown
   kernel_power_off
   hibernate.cold
   state_store
   kernfs_fop_write_iter
   vfs_write
   ksys_write
   do_syscall_64
   entry_SYSCALL_64_after_hwframe

Pass in a pointer to the function-local error var in the caller.

With that addressed, suspending the ccp shows the error properly at
least:

  ccp 0000:47:00.1: sev command 0x2 timed out, disabling PSP
  ccp 0000:47:00.1: SEV: failed to SHUTDOWN error 0x0, rc -110
  SEV-SNP: Leaking PFN range 0x146800-0x146a00
  SEV-SNP: PFN 0x146800 unassigned, dumping non-zero entries in 2M PFN region: [0x146800 - 0x146a00]
  ...
  ccp 0000:47:00.1: SEV-SNP firmware shutdown failed, rc -16, error 0x0
  ACPI: PM: Preparing to enter system sleep state S5
  kvm: exiting hardware virtualization
  reboot: Power down

Btw, this driver is crying to be cleaned up to pass in a proper I/O
struct which can be used to store information between the different
functions, otherwise stuff like that will happen in the future again.

Verknüpft mit AI von unstrukturierten Daten zu bestehenden CPE der NVD
Diese Information steht angemeldeten Benutzern zur Verfügung.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
Produkt Linux
Default Statusunaffected
Version < bc509293c9d4f4f74e776f4a0bbb61f63c041938
Version 9770b428b1a28360663f1f5e524ee458b4cf454b
Status affected
Version < 46834d90a9a13549264b9581067d8f746b4b36cc
Version 9770b428b1a28360663f1f5e524ee458b4cf454b
Status affected
HerstellerLinux
Produkt Linux
Default Statusaffected
Version 6.16
Status affected
Version < 6.16
Version 0
Status unaffected
Version <= 6.16.*
Version 6.16.9
Status unaffected
Version <= *
Version 6.17
Status unaffected
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.02% 0.034
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String