CVE-2026-93045
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel, bpf_arena_free_pages() accepted arena addresses below the arena base, which after masking to the low 32 bits and reconstructing the user address led to freeing a range outside the arena mapping. The fix rejects such frees before computing the clipped range.
Risk Assessment
Improper memory range freeing can corrupt the kernel heap, cause system crashes, or potentially allow arbitrary code execution, posing a serious security threat.
Recommendation
Update the Linux kernel to a version containing the fix for bpf_arena_free_pages(); until patched, avoid using BPF programs that use the arena with untrusted input.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject arena frees below the arena base bpf_arena_free_pages() accepts scalar arena addresses. The runtime masks the address to the low 32 bits and reconstructs a full user address from the arena base before returning the range to the arena free tree. When the scalar value is below the low 32 bits of the arena base, full_uaddr falls below user_vm_start. The existing upper-end clipping then turns this into an out-of-range free-tree offset. A later allocation can reuse that offset and return an address below the arena mapping. Reject such frees before computing the clipped range.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS