Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relosIn case of malformed relocation record of kind BPF_CORE_TYPE_ID_LOCALreferencing a non-existing BTF type, function bpf_core_calc_relo_insnwould cause a null pointer deference.Fix this by adding a proper check upper in call stack, as malformedrelocation records could be passed from user space.Simplest reproducer is a program: r0 = 0 exitWith a single relocation record: .insn_off = 0, /* patch first instruction */ .type_id = 100500, /* this type id does not exist */ .access_str_off = 6, /* offset of string "0" */ .kind = BPF_CORE_TYPE_ID_LOCAL,See the link for original reproducer or next commit for a test case.
No PoCs from references.
- https://github.com/fkie-cad/nvd-json-data-feeds