{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40349",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-40349"
  ],
  "published": "2025-12-16T13:30:44Z",
  "summary": "hfs: validate record offset in hfsplus_bmap_alloc",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfs: validate record offset in hfsplus_bmap_alloc\n\nhfsplus_bmap_alloc can trigger a crash if a\nrecord offset or length is larger than node_size\n\n[   15.264282] BUG: KASAN: slab-out-of-bounds in hfsplus_bmap_alloc+0x887/0x8b0\n[   15.265192] Read of size 8 at addr ffff8881085ca188 by task test/183\n[   15.265949]\n[   15.266163] CPU: 0 UID: 0 PID: 183 Comm: test Not tainted 6.17.0-rc2-gc17b750b3ad9 #14 PREEMPT(voluntary)\n[   15.266165] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[   15.266167] Call Trace:\n[   15.266168]  <TASK>\n[   15.266169]  dump_stack_lvl+0x53/0x70\n[   15.266173]  print_report+0xd0/0x660\n[   15.266181]  kasan_report+0xce/0x100\n[   15.266185]  hfsplus_bmap_alloc+0x887/0x8b0\n[   15.266208]  hfs_btree_inc_height.isra.0+0xd5/0x7c0\n[   15.266217]  hfsplus_brec_insert+0x870/0xb00\n[   15.266222]  __hfsplus_ext_write_extent+0x428/0x570\n[   15.266225]  __hfsplus_ext_cache_extent+0x5e/0x910\n[   15.266227]  hfsplus_ext_read_extent+0x1b2/0x200\n[   15.266233]  hfsplus_file_extend+0x5a7/0x1000\n[   15.266237]  hfsplus_get_block+0x12b/0x8c0\n[   15.266238]  __block_write_begin_int+0x36b/0x12c0\n[   15.266251]  block_write_begin+0x77/0x110\n[   15.266252]  cont_write_begin+0x428/0x720\n[   15.266259]  hfsplus_write_begin+0x51/0x100\n[   15.266262]  cont_write_begin+0x272/0x720\n[   15.266270]  hfsplus_write_begin+0x51/0x100\n[   15.266274]  generic_perform_write+0x321/0x750\n[   15.266285]  generic_file_write_iter+0xc3/0x310\n[   15.266289]  __kernel_write_iter+0x2fd/0x800\n[   15.266296]  dump_user_range+0x2ea/0x910\n[   15.266301]  elf_core_dump+0x2a94/0x2ed0\n[   15.266320]  vfs_coredump+0x1d85/0x45e0\n[   15.266349]  get_signal+0x12e3/0x1990\n[   15.266357]  arch_do_signal_or_restart+0x89/0x580\n[   15.266362]  irqentry_exit_to_user_mode+0xab/0x110\n[   15.266364]  asm_exc_page_fault+0x26/0x30\n[   15.266366] RIP: 0033:0x41bd35\n[   15.266367] Code: bc d1 f3 0f 7f 27 f3 0f 7f 6f 10 f3 0f 7f 77 20 f3 0f 7f 7f 30 49 83 c0 0f 49 29 d0 48 8d 7c 17 31 e9 9f 0b 00 00 66 0f ef c0 <f3> 0f 6f 0e f3 0f 6f 56 10 66 0f 74 c1 66 0f d7 d0 49 83 f8f\n[   15.266369] RSP: 002b:00007ffc9e62d078 EFLAGS: 00010283\n[   15.266371] RAX: 00007ffc9e62d100 RBX: 0000000000000000 RCX: 0000000000000000\n[   15.266372] RDX: 00000000000000e0 RSI: 0000000000000000 RDI: 00007ffc9e62d100\n[   15.266373] RBP: 0000400000000040 R08: 00000000000000e0 R09: 0000000000000000\n[   15.266374] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\n[   15.266375] R13: 0000000000000000 R14: 0000000000000000 R15: 0000400000000000\n[   15.266376]  </TASK>\n\nWhen calling hfsplus_bmap_alloc to allocate a free node, this function\nfirst retrieves the bitmap from header node and map node using node->page\ntogether with the offset and length from hfs_brec_lenoff\n\n```\nlen = hfs_brec_lenoff(node, 2, &off16);\noff = off16;\n\noff += node->page_offset;\npagep = node->page + (off >> PAGE_SHIFT);\ndata = kmap_local_page(*pagep);\n```\n\nHowever, if the retrieved offset or length is invalid(i.e. exceeds\nnode_size), the code may end up accessing pages outside the allocated\nrange for this node.\n\nThis patch adds proper validation of both offset and length before use,\npreventing out-of-bounds page access. Move is_bnode_offset_valid and\ncheck_and_correct_requested_length to hfsplus_fs.h, as they may be\nrequired by other functions.",
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