Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ec0e2da95f72d4a46050a4d994e4fe471474fd80 before 3bce44b344040e5eef3d64d38b157c15304c0aab; affected ec0e2da95f72d4a46050a4d994e4fe471474fd80 before 5017c302ca4b2a45149ad64e058fa2d5623c068f; affected ec0e2da95f72d4a46050a4d994e4fe471474fd80 before 21167bf70dbe400563e189ac632258d35eda38b5; affected ec0e2da95f72d4a46050a4d994e4fe471474fd80 before 55c0ced59fe17dee34e9dfd5f7be63cbab207758 |
| Linux / Linux | affected 6.6; unaffected 0 before 6.6; unaffected 6.6.112 through 6.6.*; unaffected 6.12.53 through 6.12.*; unaffected 6.17.3 through 6.17.*; unaffected 6.18 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/3bce44b344040e5eef3d64d38b157c15304c0aab
- https://git.kernel.org/stable/c/5017c302ca4b2a45149ad64e058fa2d5623c068f
- https://git.kernel.org/stable/c/21167bf70dbe400563e189ac632258d35eda38b5
- https://git.kernel.org/stable/c/55c0ced59fe17dee34e9dfd5f7be63cbab207758
ADP enrichment
No English description supplied.
No references supplied.