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---