CVE-2025-40169High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: bpf: Reject negative offsets for ALU ops When verifying BPF programs, the check_alu_op() function validates instructions with ALU operations. The 'offset' field in the…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 15.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
bpf: Reject negative offsets for ALU ops
When verifying BPF programs, the check_alu_op() function validates instructions with ALU operations. The 'offset' field in these instructions is a signed 16-bit integer.
The existing check 'insn->off > 1' was intended to ensure the offset is either 0, or 1 for BPF_MOD/BPF_DIV. However, because 'insn->off' is signed, this check incorrectly accepts all negative values (e.g., -1).
This commit tightens the validation by changing the condition to '(insn->off != 0 && insn->off != 1)'. This ensures that any value other than the explicitly permitted 0 and 1 is rejected, hardening the verifier against malformed BPF programs.
Linux >= ec0e2da95f72d4a46050a4d994e4fe471474fd80 < 3bce44b344040e5eef3d64d38b157c15304c0aabLinux >= ec0e2da95f72d4a46050a4d994e4fe471474fd80 < 5017c302ca4b2a45149ad64e058fa2d5623c068fLinux >= ec0e2da95f72d4a46050a4d994e4fe471474fd80 < 21167bf70dbe400563e189ac632258d35eda38b5Linux >= ec0e2da95f72d4a46050a4d994e4fe471474fd80 < 55c0ced59fe17dee34e9dfd5f7be63cbab207758Linux 6.6Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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