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:libnvdimm/labels: Fix divide error in nd_label_data_init()If a faulty CXL memory device returns a broken zero LSA size in itsmemory device information (Identify Memory Device (Opcode 4000h), CXLspec. 3.1, 8.2.9.9.1.1), a divide error occurs in the libnvdimmdriver: Oops: divide error: 0000 [#1] PREEMPT SMP NOPTI RIP: 0010:nd_label_data_init+0x10e/0x800 [libnvdimm]Code and flow:1) CXL Command 4000h returns LSA size = 02) config_size is assigned to zero LSA size (CXL pmem driver):drivers/cxl/pmem.c: .config_size = mds->lsa_size,3) max_xfer is set to zero (nvdimm driver):drivers/nvdimm/label.c: max_xfer = min_t(size_t, ndd->nsarea.max_xfer, config_size);4) A subsequent DIV_ROUND_UP() causes a division by zero:drivers/nvdimm/label.c: /* Make our initial read size a multiple of max_xfer size */drivers/nvdimm/label.c: read_size = min(DIV_ROUND_UP(read_size, max_xfer) * max_xfer,drivers/nvdimm/label.c- config_size);Fix this by checking the config size parameter by extending anexisting check.
No PoCs from references.
- https://github.com/w4zu/Debian_security