Linux kernel crypto: ccp out-of-bounds read and kernel memory leak in SEV CPU ID retrieval
CVE-2026-31697 is a Linux kernel vulnerability in the crypto: ccp subsystem, specifically in the SEV/PSP CPU ID retrieval ioctl path. When retrieving the CPU ID blob, the kernel could attempt to copy data to userspace even if the underlying PSP firmware command failed. If the failure was caused by an invalid length condition, such as a userspace buffer that was too small, the code could use the firmware-reported required size when calling copy_to_user(), even though the kernel-allocated buffer was smaller. This results in a slab out-of-bounds read from kernel memory during the copy operation and can leak adjacent kernel memory to userspace. The reported fault path includes sev_ioctl_do_get_id2() in drivers/crypto/ccp/sev-dev.c, with KASAN detecting the issue as a slab-out-of-bounds read in _copy_to_user(). The fix prevents copying the ID blob to userspace when the PSP command fails and adds a WARN for inconsistent driver-success versus firmware-error states.
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Recent activity
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Linux kernel vulnerability in crypto ccp userspace copy handling after PSP command failure.
A Linux kernel vulnerability in the crypto CCP component involving copying ID data to userspace after a failed PSP command.
A Linux kernel vulnerability in the crypto/ccp SEV/PSP ID retrieval path where a failed firmware command could still lead to copying an ID blob to userspace, causing a slab out-of-bounds read and potential kernel memory disclosure to userspace.
Linux kernel vulnerability in crypto ccp where failed PSP commands could still trigger copying ID data to userspace.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.