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CVE-2026-64308— crypto: ccp - Do not initialize SNP for ioctl(SNP_VLEK_LOAD)

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.16版本存在安全漏洞，该漏洞源于crypto: ccp组件中未对ioctl(SNP_VLEK_LOAD)操作进行正确的初始化检查，可能导致用户空间进程通过/dev/sev ioctls触发，零化MSR_VM_HSAVE_PA，进而导致主机崩溃。

AI Predicted 5.3 Difficulty: Hard EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1499.001 · OS Exhaustion Flood

Affected Version Matrix 11

VendorProduct Version RangeStatus
Linux Linux 1c3506ea8599a3ad1b9aae5cbd573134f8d18db7< 61cf5eef20657bff9ca235fe938a99ce5ff65c06 affected
ceac7fb89e8da465aec3ac3c20477f912f5c3a6c< 92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4 affected
ceac7fb89e8da465aec3ac3c20477f912f5c3a6c< 8836801847b9479ac046cb18a24981e1b0b05e9d affected
ceac7fb89e8da465aec3ac3c20477f912f5c3a6c< f91e9dbb5845d1e5abf1028e6df57dcf61583e1b affected
6.12.75< 6.12.96 affected
6.16 affected
< 6.16 unaffected
6.12.96≤ 6.12.* unaffected
… +3 more rows
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I. Basic Information for CVE-2026-64308

Vulnerability Information
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Vulnerability Title
crypto: ccp - Do not initialize SNP for ioctl(SNP_VLEK_LOAD)
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Do not initialize SNP for ioctl(SNP_VLEK_LOAD) Sashiko notes: > if SEV initialization fails and KVM is actively running normal VMs, could a > userspace process trigger this code path via /dev/sev ioctls (e.g., > SEV_PDH_GEN) and zero out MSR_VM_HSAVE_PA globally? Would the next VMRUN > execution for an active VM trigger a general protection fault and crash the > host? The SEV firmware docs for SNP_VLEK_LOAD note: > On SNP_SHUTDOWN, the VLEK is deleted. That is, the initialization/shutdown wrapper here is pointless, because the firmware immediately throws away the key anyway. Instead, refuse to do anything if SNP has not been previously initialized. This is an ABI break: before, this was a no-op and almost certainly a mistake by userspace, and now it returns -ENODEV. ABI compatibility could be maintained here by simply returning 0 in the check instead.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.16版本存在安全漏洞，该漏洞源于crypto: ccp组件中未对ioctl(SNP_VLEK_LOAD)操作进行正确的初始化检查，可能导致用户空间进程通过/dev/sev ioctls触发，零化MSR_VM_HSAVE_PA，进而导致主机崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1c3506ea8599a3ad1b9aae5cbd573134f8d18db7 ~ 61cf5eef20657bff9ca235fe938a99ce5ff65c06 -
Linux Linux 6.16 -

II. Public POCs for CVE-2026-64308

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III. Intelligence Information for CVE-2026-64308

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Patches & Fixes for CVE-2026-64308 (4)

Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total

CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
CVE-2026-64459 9.8 CRITICAL tcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-64303 9.8 CRITICAL spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
CVE-2026-64410 9.8 CRITICAL netfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-64399 9.8 CRITICAL ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-64397 9.8 CRITICAL ksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-64391 9.8 CRITICAL ksmbd: use opener credentials for ADS I/O
CVE-2026-64387 9.8 CRITICAL smb: client: fix query directory replay double-free
CVE-2026-64386 9.8 CRITICAL smb: client: fix query_info() replay double-free
CVE-2026-64385 9.8 CRITICAL smb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-64383 9.8 CRITICAL smb: client: fix double-free in SMB2_flush() replay
CVE-2026-64384 9.8 CRITICAL smb: client: fix change notify replay double-free
CVE-2026-64268 9.8 CRITICAL RDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64257 9.1 CRITICAL smb: client: reject overlapping data areas in SMB2 responses
CVE-2026-64392 9.1 CRITICAL ksmbd: use opener credentials for delete-on-close
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64319 9.1 CRITICAL nvmet-auth: validate reply message payload bounds against transfer length

Showing top 20 of 274 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64308

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