CVE Catalog

CVE-2026-72428

Low risk· EPSS 12%
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.21%

12th percentile - higher than 12% of all known CVEs

Summary

In the Linux kernel, in BPF, there is a stack slot index error in nospec checks. check_stack_write_fixed_off() computes the byte slot as -off - 1, but the Spectre v4 sanitization pre-check uses slot_type[i] instead, which can lead to missing sanitization for some writes.

Risk Assessment

This can lead to Spectre v4 vulnerability, allowing data leak through speculative execution.

Recommendation

Apply the Linux kernel patch that uses the same slot index in the sanitization pre-check as the write path.

Other vulnerabilities in Linux kernel

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Original NVD description (English source)

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix stack slot index in nospec checks check_stack_write_fixed_off() computes the byte slot for a fixed-offset stack write as -off - 1, and records each written byte in slot_type[] with (slot - i) % BPF_REG_SIZE. The Spectre v4 sanitization pre-check uses slot_type[i] instead. For a 4-byte write at fp-8 after the lower half of fp-8 has been zeroed, the pre-check scans bytes 0..3 and sees STACK_ZERO while the actual write updates bytes 7..4. That can leave the second half-slot write without nospec_result even though the bytes being overwritten still require sanitization. Use the same slot index in the sanitization pre-check that the write path uses when updating slot_type[].

Vulnerability data from NVD (NIST) · CISA KEV · EPSS