{
  "cveId": "CVE-2023-53706",
  "url": "https://patchblox.com/security/cve/CVE-2023-53706",
  "summary": "CVE-2023-53706 is fixed in 63 products on 1 platform, first by RHSA-2023:6583, released November 7, 2023. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mm/vmemmap/devdax: fix kernel crash when probing...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm/vmemmap/devdax: fix kernel crash when probing devdax devices  commit 4917f55b4ef9 (\u0022mm/sparse-vmemmap: improve memory savings for compound devmaps\u0022) added support for using optimized vmmemap for devdax devices.  But how vmemmap mappings are created are architecture specific.  For example, powerpc with hash translation doesn\u0027t have vmemmap mappings in init_mm page table instead they are bolted table entries in the hardware page table  vmemmap_populate_compound_pages() used by vmemmap optimization code is not aware of these architecture-specific mapping.  Hence allow architecture to opt for this feature.  I selected architectures supporting HUGETLB_PAGE_OPTIMIZE_VMEMMAP option as also supporting this feature.  This patch fixes the below crash on ppc64.  BUG: Unable to handle kernel data access on write at 0xc00c000100400038 Faulting instruction address: 0xc000000001269d90 Oops: Kernel access of bad area, sig: 11 [#1] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries Modules linked in: CPU: 7 PID: 1 Comm: swapper/0 Not tainted 6.3.0-rc5-150500.34-default\u002B #2 5c90a668b6bbd142599890245c2fb5de19d7d28a Hardware name: IBM,9009-42G POWER9 (raw) 0x4e0202 0xf000005 of:IBM,FW950.40 (VL950_099) hv:phyp pSeries NIP:  c000000001269d90 LR: c0000000004c57d4 CTR: 0000000000000000 REGS: c000000003632c30 TRAP: 0300   Not tainted  (6.3.0-rc5-150500.34-default\u002B) MSR:  8000000000009033 \u003CSF,EE,ME,IR,DR,RI,LE\u003E  CR: 24842228  XER: 00000000 CFAR: c0000000004c57d0 DAR: c00c000100400038 DSISR: 42000000 IRQMASK: 0 .... NIP [c000000001269d90] __init_single_page.isra.74\u002B0x14/0x4c LR [c0000000004c57d4] __init_zone_device_page\u002B0x44/0xd0 Call Trace: [c000000003632ed0] [c000000003632f60] 0xc000000003632f60 (unreliable) [c000000003632f10] [c0000000004c5ca0] memmap_init_zone_device\u002B0x170/0x250 [c000000003632fe0] [c0000000005575f8] memremap_pages\u002B0x2c8/0x7f0 [c0000000036330c0] [c000000000557b5c] devm_memremap_pages\u002B0x3c/0xa0 [c000000003633100] [c000000000d458a8] dev_dax_probe\u002B0x108/0x3e0 [c0000000036331a0] [c000000000d41430] dax_bus_probe\u002B0xb0/0x140 [c0000000036331d0] [c000000000cef27c] really_probe\u002B0x19c/0x520 [c000000003633260] [c000000000cef6b4] __driver_probe_device\u002B0xb4/0x230 [c0000000036332e0] [c000000000cef888] driver_probe_device\u002B0x58/0x120 [c000000003633320] [c000000000cefa6c] __device_attach_driver\u002B0x11c/0x1e0 [c0000000036333a0] [c000000000cebc58] bus_for_each_drv\u002B0xa8/0x130 [c000000003633400] [c000000000ceefcc] __device_attach\u002B0x15c/0x250 [c0000000036334a0] [c000000000ced458] bus_probe_device\u002B0x108/0x110 [c0000000036334f0] [c000000000ce92dc] device_add\u002B0x7fc/0xa10 [c0000000036335b0] [c000000000d447c8] devm_create_dev_dax\u002B0x1d8/0x530 [c000000003633640] [c000000000d46b60] __dax_pmem_probe\u002B0x200/0x270 [c0000000036337b0] [c000000000d46bf0] dax_pmem_probe\u002B0x20/0x70 [c0000000036337d0] [c000000000d2279c] nvdimm_bus_probe\u002B0xac/0x2b0 [c000000003633860] [c000000000cef27c] really_probe\u002B0x19c/0x520 [c0000000036338f0] [c000000000cef6b4] __driver_probe_device\u002B0xb4/0x230 [c000000003633970] [c000000000cef888] driver_probe_device\u002B0x58/0x120 [c0000000036339b0] [c000000000cefd08] __driver_attach\u002B0x1d8/0x240 [c000000003633a30] [c000000000cebb04] bus_for_each_dev\u002B0xb4/0x130 [c000000003633a90] [c000000000cee564] driver_attach\u002B0x34/0x50 [c000000003633ab0] [c000000000ced878] bus_add_driver\u002B0x218/0x300 [c000000003633b40] [c000000000cf1144] driver_register\u002B0xa4/0x1b0 [c000000003633bb0] [c000000000d21a0c] __nd_driver_register\u002B0x5c/0x100 [c000000003633c10] [c00000000206a2e8] dax_pmem_init\u002B0x34/0x48 [c000000003633c30] [c0000000000132d0] do_one_initcall\u002B0x60/0x320 [c000000003633d00] [c0000000020051b0] kernel_init_freeable\u002B0x360/0x400 [c000000003633de0] [c000000000013764] kernel_init\u002B0x34/0x1d0 [c000000003633e50] [c00000000000de14] ret_from_kernel_thread\u002B0x5c/0x64",
  "published": "2023-11-07T00:00:00Z",
  "severity": "Important",
  "cvss": 5.8,
  "epss": 0.00213,
  "epssPercentile": 0.11682,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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