CVE-2026-31698

HIGH EPSS 2.6%
Published May 1, 20262mo ago · Modified Jun 17, 20261w ago
7.1 CVSS 3.1
High
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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 PDH cert to userspace if PSP command failed When retrieving the PDH cert, don't attempt to copy the blobs 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 2084 at addr ffff8885c4ab8aa0 by task syz.0.186/21033 CPU: 51 UID: 0 PID: 21033 Comm: syz.0.186 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 34.84.12-0 11/17/2025 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_pdh_export+0x3d3/0x7c0 ../drivers/crypto/ccp/sev-dev.c:2347 sev_ioctl+0x2a2/0x490 ../drivers/crypto/ccp/sev-dev.c:2568 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*≥4.16  –  <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/051e51aa55fd4cdc3e8283cf4476aeeb5f563274
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/25d9b3446001185484209cf57951f3368462b631
  • git.kernel.org https://git.kernel.org/stable/c/50808c13452dae43a2c90b1bbbf9daa16501ce70
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/78b97e43d0b3e674d9d49ae56937b11e2ba3fcaf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/854d7846e1d29f32f1bbeb2e869e794df12067f6
  • git.kernel.org https://git.kernel.org/stable/c/af67d35da744b6b678c7a0296d9c679658779829
  • git.kernel.org https://git.kernel.org/stable/c/b5c14bd4da1f376f385722fe1da993f1edab6472
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e76239fed3cffd6d304d8ca3ce23984fd24f57d3
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/051e51aa55fd4cdc3e8283cf4476aeeb5f563274
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/50808c13452dae43a2c90b1bbbf9daa16501ce70
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/78b97e43d0b3e674d9d49ae56937b11e2ba3fcaf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b5c14bd4da1f376f385722fe1da993f1edab6472
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e76239fed3cffd6d304d8ca3ce23984fd24f57d3
    Patch