{"id":"DEBIAN-CVE-2023-53862","details":"In the Linux kernel, the following vulnerability has been resolved:  hfs: fix missing hfs_bnode_get() in __hfs_bnode_create  Syzbot found a kernel BUG in hfs_bnode_put():   kernel BUG at fs/hfs/bnode.c:466!  invalid opcode: 0000 [#1] PREEMPT SMP KASAN  CPU: 0 PID: 3634 Comm: kworker/u4:5 Not tainted 6.1.0-rc7-syzkaller-00190-g97ee9d1c1696 #0  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022  Workqueue: writeback wb_workfn (flush-7:0)  RIP: 0010:hfs_bnode_put+0x46f/0x480 fs/hfs/bnode.c:466  Code: 8a 80 ff e9 73 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c a0 fe ff ff 48 89 df e8 db 8a 80 ff e9 93 fe ff ff e8 a1 68 2c ff \u003c0f\u003e 0b e8 9a 68 2c ff 0f 0b 0f 1f 84 00 00 00 00 00 55 41 57 41 56  RSP: 0018:ffffc90003b4f258 EFLAGS: 00010293  RAX: ffffffff825e318f RBX: 0000000000000000 RCX: ffff8880739dd7c0  RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000  RBP: ffffc90003b4f430 R08: ffffffff825e2d9b R09: ffffed10045157d1  R10: ffffed10045157d1 R11: 1ffff110045157d0 R12: ffff8880228abe80  R13: ffff88807016c000 R14: dffffc0000000000 R15: ffff8880228abe00  FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033  CR2: 00007fa6ebe88718 CR3: 000000001e93d000 CR4: 00000000003506f0  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400  Call Trace:   \u003cTASK\u003e   hfs_write_inode+0x1bc/0xb40   write_inode fs/fs-writeback.c:1440 [inline]   __writeback_single_inode+0x4d6/0x670 fs/fs-writeback.c:1652   writeback_sb_inodes+0xb3b/0x18f0 fs/fs-writeback.c:1878   __writeback_inodes_wb+0x125/0x420 fs/fs-writeback.c:1949   wb_writeback+0x440/0x7b0 fs/fs-writeback.c:2054   wb_check_start_all fs/fs-writeback.c:2176 [inline]   wb_do_writeback fs/fs-writeback.c:2202 [inline]   wb_workfn+0x827/0xef0 fs/fs-writeback.c:2235   process_one_work+0x877/0xdb0 kernel/workqueue.c:2289   worker_thread+0xb14/0x1330 kernel/workqueue.c:2436   kthread+0x266/0x300 kernel/kthread.c:376   ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306   \u003c/TASK\u003e  The BUG_ON() is triggered at here:  /* Dispose of resources used by a node */ void hfs_bnode_put(struct hfs_bnode *node) { \tif (node) {  \t\t\u003cskipped\u003e  \t\tBUG_ON(!atomic_read(&node-\u003erefcnt)); \u003c- we have issue here!!!!  \t\t\u003cskipped\u003e  \t} }  By tracing the refcnt, I found the node is created by hfs_bmap_alloc() with refcnt 1.  Then the node is used by hfs_btree_write().  There is a missing of hfs_bnode_get() after find the node.  The issue happened in following path:  \u003calloc\u003e  hfs_bmap_alloc    hfs_bnode_find      __hfs_bnode_create   \u003c- allocate a new node with refcnt 1.    hfs_bnode_put          \u003c- decrease the refcnt  \u003cwrite\u003e  hfs_btree_write    hfs_bnode_find      __hfs_bnode_create        hfs_bnode_findhash \u003c- find the node without refcnt increased.    hfs_bnode_put\t  \u003c- trigger the BUG_ON() since refcnt is 0.","modified":"2026-09-15T09:03:02.945704121Z","published":"2025-12-09T16:17:26.970Z","upstream":["CVE-2023-53862"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-53862"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.20-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53862.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.20-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53862.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.20-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53862.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"}]}