{"id":"DEBIAN-CVE-2025-40349","details":"In the Linux kernel, the following vulnerability has been resolved:  hfs: validate record offset in hfsplus_bmap_alloc  hfsplus_bmap_alloc can trigger a crash if a record offset or length is larger than node_size  [   15.264282] BUG: KASAN: slab-out-of-bounds in hfsplus_bmap_alloc+0x887/0x8b0 [   15.265192] Read of size 8 at addr ffff8881085ca188 by task test/183 [   15.265949] [   15.266163] CPU: 0 UID: 0 PID: 183 Comm: test Not tainted 6.17.0-rc2-gc17b750b3ad9 #14 PREEMPT(voluntary) [   15.266165] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [   15.266167] Call Trace: [   15.266168]  \u003cTASK\u003e [   15.266169]  dump_stack_lvl+0x53/0x70 [   15.266173]  print_report+0xd0/0x660 [   15.266181]  kasan_report+0xce/0x100 [   15.266185]  hfsplus_bmap_alloc+0x887/0x8b0 [   15.266208]  hfs_btree_inc_height.isra.0+0xd5/0x7c0 [   15.266217]  hfsplus_brec_insert+0x870/0xb00 [   15.266222]  __hfsplus_ext_write_extent+0x428/0x570 [   15.266225]  __hfsplus_ext_cache_extent+0x5e/0x910 [   15.266227]  hfsplus_ext_read_extent+0x1b2/0x200 [   15.266233]  hfsplus_file_extend+0x5a7/0x1000 [   15.266237]  hfsplus_get_block+0x12b/0x8c0 [   15.266238]  __block_write_begin_int+0x36b/0x12c0 [   15.266251]  block_write_begin+0x77/0x110 [   15.266252]  cont_write_begin+0x428/0x720 [   15.266259]  hfsplus_write_begin+0x51/0x100 [   15.266262]  cont_write_begin+0x272/0x720 [   15.266270]  hfsplus_write_begin+0x51/0x100 [   15.266274]  generic_perform_write+0x321/0x750 [   15.266285]  generic_file_write_iter+0xc3/0x310 [   15.266289]  __kernel_write_iter+0x2fd/0x800 [   15.266296]  dump_user_range+0x2ea/0x910 [   15.266301]  elf_core_dump+0x2a94/0x2ed0 [   15.266320]  vfs_coredump+0x1d85/0x45e0 [   15.266349]  get_signal+0x12e3/0x1990 [   15.266357]  arch_do_signal_or_restart+0x89/0x580 [   15.266362]  irqentry_exit_to_user_mode+0xab/0x110 [   15.266364]  asm_exc_page_fault+0x26/0x30 [   15.266366] RIP: 0033:0x41bd35 [   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 \u003cf3\u003e 0f 6f 0e f3 0f 6f 56 10 66 0f 74 c1 66 0f d7 d0 49 83 f8f [   15.266369] RSP: 002b:00007ffc9e62d078 EFLAGS: 00010283 [   15.266371] RAX: 00007ffc9e62d100 RBX: 0000000000000000 RCX: 0000000000000000 [   15.266372] RDX: 00000000000000e0 RSI: 0000000000000000 RDI: 00007ffc9e62d100 [   15.266373] RBP: 0000400000000040 R08: 00000000000000e0 R09: 0000000000000000 [   15.266374] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [   15.266375] R13: 0000000000000000 R14: 0000000000000000 R15: 0000400000000000 [   15.266376]  \u003c/TASK\u003e  When calling hfsplus_bmap_alloc to allocate a free node, this function first retrieves the bitmap from header node and map node using node-\u003epage together with the offset and length from hfs_brec_lenoff  ``` len = hfs_brec_lenoff(node, 2, &off16); off = off16;  off += node-\u003epage_offset; pagep = node-\u003epage + (off \u003e\u003e PAGE_SHIFT); data = kmap_local_page(*pagep); ```  However, if the retrieved offset or length is invalid(i.e. exceeds node_size), the code may end up accessing pages outside the allocated range for this node.  This patch adds proper validation of both offset and length before use, preventing out-of-bounds page access. Move is_bnode_offset_valid and check_and_correct_requested_length to hfsplus_fs.h, as they may be required by other functions.","modified":"2026-09-01T16:06:17.573345892Z","published":"2025-12-16T14:15:46.690Z","upstream":["CVE-2025-40349"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-40349"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.158-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-40349.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.57-1"}]}],"versions":["6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1~bpo12+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-40349.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.17.6-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.2-1~exp1","6.17.5-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-40349.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}