{"id":"DEBIAN-CVE-2025-40244","details":"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]  \u003cTASK\u003e [   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---","modified":"2026-09-01T16:06:17.296123212Z","published":"2025-12-04T16:16:17.670Z","upstream":["CVE-2025-40244"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-40244"}],"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-2025-40244.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-2025-40244.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-2025-40244.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"}]}