CVE-2025-40244: In the Linux kernel, the following vulnerability has been resolved:  hfsplus: fix KMSAN uninit-value issue in __hfsplus_ext_cache_extent()  The syzbot reported issue in __hfsplus_ext_cache_extent():  [   70.194323][ T9350] BUG: KMSAN: uninit-value in __hfsplus_ext_cache_extent+0x7d0/0x990 [   70.195022][ T9350]  __hfsplus_ext_cache_extent+0x7d0/0x990 [   70.195530][ T9350]  hfsplus_file_extend+0x74f/0x1cf0 [   70.195998][ T9350]  hfsplus_get_block+0xe16/0x17b0 [   70.196458][ T9350]  __block_write_begin_int+0x962/0x2ce0 [   70.196959][ T9350]  cont_write_begin+0x1000/0x1950 [   70.197416][ T9350]  hfsplus_write_begin+0x85/0x130 [   70.197873][ T9350]  generic_perform_write+0x3e8/0x1060 [   70.198374][ T9350]  __generic_file_write_iter+0x215/0x460 [   70.198892][ T9350]  generic_file_write_iter+0x109/0x5e0 [   70.199393][ T9350]  vfs_write+0xb0f/0x14e0 [   70.199771][ T9350]  ksys_write+0x23e/0x490 [   70.200149][ T9350]  __x64_sys_write+0x97/0xf0 [   70.200570][ T9350]  x64_sys_call+0x3015/0x3cf0 [   70.201065][ T9350]  do_syscall_64+0xd9/0x1d0 [   70.201506][ T9350]  entry_SYSCALL_64_after_hwframe+0x77/0x7f [   70.202054][ T9350] [   70.202279][ T9350] Uninit was created at: [   70.202693][ T9350]  __kmalloc_noprof+0x621/0xf80 [   70.203149][ T9350]  hfsplus_find_init+0x8d/0x1d0 [   70.203602][ T9350]  hfsplus_file_extend+0x6ca/0x1cf0 [   70.204087][ T9350]  hfsplus_get_block+0xe16/0x17b0 [   70.204561][ T9350]  __block_write_begin_int+0x962/0x2ce0 [   70.205074][ T9350]  cont_write_begin+0x1000/0x1950 [   70.205547][ T9350]  hfsplus_write_begin+0x85/0x130 [   70.206017][ T9350]  generic_perform_write+0x3e8/0x1060 [   70.206519][ T9350]  __generic_file_write_iter+0x215/0x460 [   70.207042][ T9350]  generic_file_write_iter+0x109/0x5e0 [   70.207552][ T9350]  vfs_write+0xb0f/0x14e0 [   70.207961][ T9350]  ksys_write+0x23e/0x490 [   70.208375][ T9350]  __x64_sys_write+0x97/0xf0 [   70.208810][ T9350]  x64_sys_call+0x3015/0x3cf0 [   70.209255][ T9350]  do_syscall_64+0xd9/0x1d0 [   70.209680][ T9350]  entry_SYSCALL_64_after_hwframe+0x77/0x7f [   70.210230][ T9350] [   70.210454][ T9350] CPU: 2 UID: 0 PID: 9350 Comm: repro Not tainted 6.12.0-rc5 #5 [   70.211174][ T9350] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [   70.212115][ T9350] ===================================================== [   70.212734][ T9350] Disabling lock debugging due to kernel taint [   70.213284][ T9350] Kernel panic - not syncing: kmsan.panic set ... [   70.213858][ T9350] CPU: 2 UID: 0 PID: 9350 Comm: repro Tainted: G    B              6.12.0-rc5 #5 [   70.214679][ T9350] Tainted: [B]=BAD_PAGE [   70.215057][ T9350] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [   70.215999][ T9350] Call Trace: [   70.216309][ T9350]  <TASK> [   70.216585][ T9350]  dump_stack_lvl+0x1fd/0x2b0 [   70.217025][ T9350]  dump_stack+0x1e/0x30 [   70.217421][ T9350]  panic+0x502/0xca0 [   70.217803][ T9350]  ? kmsan_get_metadata+0x13e/0x1c0  [   70.218294][ Message fromT sy9350]  kmsan_report+0x296/slogd@syzkaller 0x2aat Aug 18 22:11:058 ...  kernel :[   70.213284][ T9350] Kernel panic - not syncing: kmsan.panic [   70.220179][ T9350]  ? kmsan_get_metadata+0x13e/0x1c0 set ... [   70.221254][ T9350]  ? __msan_warning+0x96/0x120 [   70.222066][ T9350]  ? __hfsplus_ext_cache_extent+0x7d0/0x990 [   70.223023][ T9350]  ? hfsplus_file_extend+0x74f/0x1cf0 [   70.224120][ T9350]  ? hfsplus_get_block+0xe16/0x17b0 [   70.224946][ T9350]  ? __block_write_begin_int+0x962/0x2ce0 [   70.225756][ T9350]  ? cont_write_begin+0x1000/0x1950 [   70.226337][ T9350]  ? hfsplus_write_begin+0x85/0x130 [   70.226852][ T9350]  ? generic_perform_write+0x3e8/0x1060 [   70.227405][ T9350]  ? __generic_file_write_iter+0x215/0x460 [   70.227979][ T9350]  ? generic_file_write_iter+0x109/0x5e0 [   70.228540][ T9350]  ? vfs_write+0xb0f/0x14e0 [   70.228997][ T9350]  ? ksys_write+0x23e/0x490 ---truncated---