CVE-2026-90069
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel, ACOMP_REQUEST_ON_STACK() reserves only enough storage for the synchronous fallback. When an async implementation is selected, acomp_request_clone() copies only the stack-sized object, so the clone has no storage for the async provider request context. Providers such as QAT write past the allocation through acomp_request_ctx(), reported by KASAN as a slab OOB write.
Risk Assessment
An out-of-bounds write can corrupt kernel memory, cause system crashes, or potentially be exploited for privilege escalation. Affects systems using asynchronous crypto implementations such as QAT.
Recommendation
Update the Linux kernel to a version with the fix that allocates a zeroed clone large enough for the runtime acomp request size. Check whether asynchronous crypto accelerators are in use.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: crypto: acomp - allocate async request context when cloning ACOMP_REQUEST_ON_STACK() reserves only enough storage for the synchronous fallback. When an async implementation is selected, callers clone that stack request before retrying, but acomp_request_clone() currently copies only the stack-sized object. The clone therefore has no storage for the async provider request context, and providers such as QAT write past the allocation through acomp_request_ctx(). KASAN does report a slab OOB write. Allocate a zeroed clone large enough for the runtime acomp request size, copy only the bytes present in the source object, and preserve the existing fallback-on-allocation-failure behavior. Use the runtime reqsize because an implementation may adjust it during tfm initialization.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS