Answer in brief
CVE-2026-31699 records a High severity (CVSS 7.1) vulnerability in crypto: ccp: Don't attempt to copy CSR to userspace if PSP command failed. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e799035609e1526761aa2f896a974b233d04d36d <502d10a1d9d477e6c7fc7021a2dac7018f4ab8b5 || >=e799035609e1526761aa2f896a974b233d04d36d <0fb87e44b81385f940b482cba5b3f0bd18fb8185 || >=e799035609e1526761aa2f896a974b233d04d36d <372116eece159adff631b1508344c8b85ebf9559 || >=e799035609e1526761aa2f896a974b233d04d36d <607ba280f2adb5092cf5386c3935afac2ca0031a || >=e799035609e1526761aa2f896a974b233d04d36d <59e9ae81f8670ccc780bc75f45a355736f640ec9 || >=e799035609e1526761aa2f896a974b233d04d36d <111dcc6d0f016076745824a787d25609d0022f4c || >=e799035609e1526761aa2f896a974b233d04d36d <3b4fd8f15765d9a3105b834dba8a05d025e5e16e || >=e799035609e1526761aa2f896a974b233d04d36d <abe4a6d6f606113251868c2c4a06ba904bb41eed | 502d10a1d9d477e6c7fc7021a2dac7018f4ab8b5, 0fb87e44b81385f940b482cba5b3f0bd18fb8185, 372116eece159adff631b1508344c8b85ebf9559, 607ba280f2adb5092cf5386c3935afac2ca0031a, 59e9ae81f8670ccc780bc75f45a355736f640ec9, 111dcc6d0f016076745824a787d25609d0022f4c, 3b4fd8f15765d9a3105b834dba8a05d025e5e16e, abe4a6d6f606113251868c2c4a06ba904bb41eed |
| Linux/Linuxgeneric | 4.16 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
May 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
In the Linux kernel, the following vulnerability has been resolved: crypto: ccp: Don't attempt to copy CSR to userspace if PSP command failed When retrieving the PEK CSR, don't attempt to copy the 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 2084 at addr ffff898144612e20 by task syz.9.219/21405 CPU: 14 UID: 0 PID: 21405 Comm: syz.9.219 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_pek_csr+0x31f/0x590 ../drivers/crypto/ccp/sev-dev.c:1872 sev_ioctl+0x3a4/0x490 ../drivers/crypto/ccp/sev-dev.c:2562 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.
Quoted source text, attributed separately from HOL analysis.