UBUNTU-CVE-2026-31413
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix unsound scalar forking in maybe_fork_scalars() for BPF_OR maybe_fork_scalars() is called for both BPF_AND and BPF_OR when the source operand is a constant. When dst has signed range [-1, 0], it forks the verifier state: the pushed path gets dst = 0, the current path gets dst = -1. For BPF_AND this is correct: 0 & K == 0. For BPF_OR this is wrong: 0 | K == K, not 0. The pushed path therefore tracks dst as 0 when the runtime value is K, producing an exploitable verifier/runtime divergence that allows out-of-bounds map access. Fix this by passing env->insn_idx (instead of env->insn_idx + 1) to push_stack(), so the pushed path re-executes the ALU instruction with dst = 0 and naturally computes the correct result for any opcode.
02 / AFFECTED SOFTWARE
Affected packages
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50 explicit affected versions
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11 explicit affected versions
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18 explicit affected versions
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45 explicit affected versions
14 explicit affected versions
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78 explicit affected versions
11 explicit affected versions
1 explicit affected versions
39 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix unsound scalar forking in maybe_fork_scalars() for BPF_OR maybe_fork_scalars() is called for both BPF_AND and BPF_OR when the source operand is a constant. When dst has signed range [-1, 0], it forks the verifier state: the pushed path gets dst = 0, the current path gets dst = -1. For BPF_AND this is correct: 0 & K == 0. For BPF_OR this is wrong: 0 | K == K, not 0. The pushed path therefore tracks dst as 0 when the runtime value is K, producing an exploitable verifier/runtime divergence that allows out-of-bounds map access. Fix this by passing env->insn_idx (instead of env->insn_idx + 1) to push_stack(), so the pushed path re-executes the ALU instruction with dst = 0 and naturally computes the correct result for any opcode.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/c845894ebd6fb43226b3118d6b017942550910c5
- https://git.kernel.org/stable/c/342aa1ee995ef5bbf876096dc3a5e51218d76fa4
- https://git.kernel.org/stable/c/58bd87d0e69204dbd739e4387a1edb0c4b1644e7
- https://git.kernel.org/stable/c/c845894ebd6fb43226b3118d6b017942550910c5
- https://git.kernel.org/stable/c/d13281ae7ea8902b21d99d10a2c8caf0bdec0455
- https://ubuntu.com/security/CVE-2026-31413
- https://ubuntu.com/security/notices/USN-8567-1
- https://ubuntu.com/security/notices/USN-8574-1
- https://ubuntu.com/security/notices/USN-8574-2
- https://ubuntu.com/security/notices/USN-8574-3
- https://ubuntu.com/security/notices/USN-8595-1
- https://ubuntu.com/security/notices/USN-8595-2
- https://ubuntu.com/security/notices/USN-8595-3
- https://ubuntu.com/security/notices/USN-8596-1
- https://ubuntu.com/security/notices/USN-8608-1
- https://www.cve.org/CVERecord?id=CVE-2026-31413