Answer in brief
CVE-2025-40169 records a Unknown severity vulnerability in bpf: Reject negative offsets for ALU ops. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <3bce44b344040e5eef3d64d38b157c15304c0aab || >=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <5017c302ca4b2a45149ad64e058fa2d5623c068f || >=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <21167bf70dbe400563e189ac632258d35eda38b5 || >=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <55c0ced59fe17dee34e9dfd5f7be63cbab207758 | 3bce44b344040e5eef3d64d38b157c15304c0aab, 5017c302ca4b2a45149ad64e058fa2d5623c068f, 21167bf70dbe400563e189ac632258d35eda38b5, 55c0ced59fe17dee34e9dfd5f7be63cbab207758 |
| Linux/Linuxgeneric | 6.6 | Not reported |
Published upstream
Nov 12, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2025-40169 records a Unknown severity vulnerability in bpf: Reject negative offsets for ALU ops. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <3bce44b344040e5eef3d64d38b157c15304c0aab || >=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <5017c302ca4b2a45149ad64e058fa2d5623c068f || >=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <21167bf70dbe400563e189ac632258d35eda38b5 || >=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <55c0ced59fe17dee34e9dfd5f7be63cbab207758 | 3bce44b344040e5eef3d64d38b157c15304c0aab, 5017c302ca4b2a45149ad64e058fa2d5623c068f, 21167bf70dbe400563e189ac632258d35eda38b5, 55c0ced59fe17dee34e9dfd5f7be63cbab207758 |
| Linux/Linuxgeneric | 6.6 | Not reported |
Published upstream
Nov 12, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.