High 7.1Published May 1, 2026

CVE-2026-31698crypto: ccp: Don't attempt to copy PDH cert to userspace if PSP command failed

Updated under an hour ago (2026-10-19 07:30 UTC)

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Exploited in the last 30 days

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: 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 before af67d35da744b6b678c7a0296d9c679658779829; from 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 before 854d7846e1d29f32f1bbeb2e869e794df12067f6; 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 builds before 25d9b3446001185484209cf57951f3368462b631; from 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 before b5c14bd4da1f376f385722fe1da993f1edab6472; from 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 before 78b97e43d0b3e674d9d49ae56937b11e2ba3fcaf; 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 builds before 051e51aa55fd4cdc3e8283cf4476aeeb5f563274; from 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 before 50808c13452dae43a2c90b1bbbf9daa16501ce70; from 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 before e76239fed3cffd6d304d8ca3ce23984fd24f57d3	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 4.16 before 6.6.136; from 6.7 before 6.12.84; from 6.13 before 6.18.25; from 6.19 before 7.0.2; 7.1; 7.1	NVD

References

https://git.kernel.org/stable/c/af67d35da744b6b678c7a0296d9c679658779829
https://git.kernel.org/stable/c/854d7846e1d29f32f1bbeb2e869e794df12067f6
https://git.kernel.org/stable/c/25d9b3446001185484209cf57951f3368462b631
https://git.kernel.org/stable/c/b5c14bd4da1f376f385722fe1da993f1edab6472patch
https://git.kernel.org/stable/c/78b97e43d0b3e674d9d49ae56937b11e2ba3fcafpatch
https://git.kernel.org/stable/c/051e51aa55fd4cdc3e8283cf4476aeeb5f563274patch
https://git.kernel.org/stable/c/50808c13452dae43a2c90b1bbbf9daa16501ce70patch
https://git.kernel.org/stable/c/e76239fed3cffd6d304d8ca3ce23984fd24f57d3patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.