CVE-2026-31697

HIGH EPSS 2.6%
Published May 1, 20262mo ago · Modified Jun 17, 20261w ago
7.1 CVSS 3.1
High
Find Similar
Published May 1, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: ccp: Don't attempt to copy ID to userspace if PSP command failed When retrieving the ID for the CPU, don't attempt to copy the ID blob to userspace if the firmware command failed. If the failure was due to an invalid length, i.e. the userspace buffer+length was too small, copying the number of bytes _firmware_ requires will overflow the kernel-allocated buffer and leak data to userspace. BUG: KASAN: slab-out-of-bounds in instrument_copy_to_user ../include/linux/instrumented.h:129 [inline] BUG: KASAN: slab-out-of-bounds in _inline_copy_to_user ../include/linux/uaccess.h:205 [inline] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x66/0xa0 ../lib/usercopy.c:26 Read of size 64 at addr ffff8881867f5960 by task syz.0.906/24388 CPU: 130 UID: 0 PID: 24388 Comm: syz.0.906 Tainted: G U O 7.0.0-smp-DEV #28 PREEMPTLAZY Tainted: [U]=USER, [O]=OOT_MODULE Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 12.62.0-0 11/19/2025 Call Trace: <TASK> dump_stack_lvl+0xc5/0x110 ../lib/dump_stack.c:120 print_address_description ../mm/kasan/report.c:378 [inline] print_report+0xbc/0x260 ../mm/kasan/report.c:482 kasan_report+0xa2/0xe0 ../mm/kasan/report.c:595 check_region_inline ../mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 ../mm/kasan/generic.c:200 instrument_copy_to_user ../include/linux/instrumented.h:129 [inline] _inline_copy_to_user ../include/linux/uaccess.h:205 [inline] _copy_to_user+0x66/0xa0 ../lib/usercopy.c:26 copy_to_user ../include/linux/uaccess.h:236 [inline] sev_ioctl_do_get_id2+0x361/0x490 ../drivers/crypto/ccp/sev-dev.c:2222 sev_ioctl+0x25f/0x490 ../drivers/crypto/ccp/sev-dev.c:2575 vfs_ioctl ../fs/ioctl.c:51 [inline] __do_sys_ioctl ../fs/ioctl.c:597 [inline] __se_sys_ioctl+0x11d/0x1b0 ../fs/ioctl.c:583 do_syscall_x64 ../arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe0/0x800 ../arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x76/0x7e </TASK> WARN if the driver says the command succeeded, but the firmware error code says otherwise, as __sev_do_cmd_locked() is expected to return -EIO on any firwmware error.

CVSS Details

Base Score
7.1
Exploitability
1.8
Impact
5.2
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 6

VendorProductVersionRange
linuxlinux_kernel*≥5.2  –  <6.6.136
linuxlinux_kernel*≥6.7  –  <6.12.84
linuxlinux_kernel*≥6.13  –  <6.18.25
linuxlinux_kernel*≥6.19  –  <7.0.2
linuxlinux_kernel7.1any
linuxlinux_kernel7.1any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/06f06d88c05ce176c61fff8c72c372847b0dd2b5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/09427bcb1715fb20a80b6acd5156dbf15ab5c363
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/0f1f2f9894893dc8a28af1b9e9dbc0abf453eb52
  • git.kernel.org https://git.kernel.org/stable/c/1fbac0429a42adec830491757a2b53956dd797ea
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2937f17bbeefb8e7608ff1f78cffbeb3d0281e5e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4f685dbfa87c546e51d9dc6cab379d20f275e114
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/99bae2e3c3f9ba8f854c938ed2c811b6a63b28e4
  • git.kernel.org https://git.kernel.org/stable/c/a21ae9f8769e5f75433bb0a85ac3868b2100ef5b

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/06f06d88c05ce176c61fff8c72c372847b0dd2b5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/09427bcb1715fb20a80b6acd5156dbf15ab5c363
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1fbac0429a42adec830491757a2b53956dd797ea
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2937f17bbeefb8e7608ff1f78cffbeb3d0281e5e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4f685dbfa87c546e51d9dc6cab379d20f275e114
    Patch