CVE-2026-93127
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In the Linux kernel, the BPF verifier mishandles scalar ids when filling the stack with sign-extending narrowing loads. The shared scalar id is not dropped, so two registers can share the same id while holding different values, allowing the verifier to infer incorrect bounds and enabling an out-of-bounds access.
Risk Assessment
The BPF verifier can be bypassed to achieve out-of-bounds memory access, potentially leading to privilege escalation or arbitrary kernel code execution.
Recommendation
Update the Linux kernel to a version containing the BPF subsystem fix.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bpf: Drop scalar id on sign-extending narrowing stack fills When a spilled scalar is filled back with a sign-extending narrowing load (BPF_MEMSX), check_stack_read_fixed_off() copies the spilled register including its scalar id, but coerce_reg_to_size_sx() then sign-extends the filled register's value. If the same slot is also filled with a plain zero-extending load (BPF_MEM), both destination registers share the id yet hold different values. A later 'if <zext-reg> == const' then refines the sign-extended register through sync_linked_regs() to a value it does not have at runtime (e.g. the verifier believes 0x80000000 while the register is 0xffffffff80000000), which can be turned into an out-of-bounds access. Drop the shared scalar id at the sign-extension site in check_mem_access() when sign extension actually changes the value, mirroring the BPF_MOVSX handling in check_alu_op() (no_sext = reg_umax < 2^(size*8-1)).
Vulnerability data from NVD (NIST) · CISA KEV · EPSS