{"id":"CVE-2023-53862","summary":"hfs: fix missing hfs_bnode_get() in __hfs_bnode_create","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nhfs: fix missing hfs_bnode_get() in __hfs_bnode_create\n\nSyzbot found a kernel BUG in hfs_bnode_put():\n\n kernel BUG at fs/hfs/bnode.c:466!\n invalid opcode: 0000 [#1] PREEMPT SMP KASAN\n CPU: 0 PID: 3634 Comm: kworker/u4:5 Not tainted 6.1.0-rc7-syzkaller-00190-g97ee9d1c1696 #0\n Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\n Workqueue: writeback wb_workfn (flush-7:0)\n RIP: 0010:hfs_bnode_put+0x46f/0x480 fs/hfs/bnode.c:466\n 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\n RSP: 0018:ffffc90003b4f258 EFLAGS: 00010293\n RAX: ffffffff825e318f RBX: 0000000000000000 RCX: ffff8880739dd7c0\n RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000\n RBP: ffffc90003b4f430 R08: ffffffff825e2d9b R09: ffffed10045157d1\n R10: ffffed10045157d1 R11: 1ffff110045157d0 R12: ffff8880228abe80\n R13: ffff88807016c000 R14: dffffc0000000000 R15: ffff8880228abe00\n FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007fa6ebe88718 CR3: 000000001e93d000 CR4: 00000000003506f0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n Call Trace:\n  \u003cTASK\u003e\n  hfs_write_inode+0x1bc/0xb40\n  write_inode fs/fs-writeback.c:1440 [inline]\n  __writeback_single_inode+0x4d6/0x670 fs/fs-writeback.c:1652\n  writeback_sb_inodes+0xb3b/0x18f0 fs/fs-writeback.c:1878\n  __writeback_inodes_wb+0x125/0x420 fs/fs-writeback.c:1949\n  wb_writeback+0x440/0x7b0 fs/fs-writeback.c:2054\n  wb_check_start_all fs/fs-writeback.c:2176 [inline]\n  wb_do_writeback fs/fs-writeback.c:2202 [inline]\n  wb_workfn+0x827/0xef0 fs/fs-writeback.c:2235\n  process_one_work+0x877/0xdb0 kernel/workqueue.c:2289\n  worker_thread+0xb14/0x1330 kernel/workqueue.c:2436\n  kthread+0x266/0x300 kernel/kthread.c:376\n  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306\n  \u003c/TASK\u003e\n\nThe BUG_ON() is triggered at here:\n\n/* Dispose of resources used by a node */\nvoid hfs_bnode_put(struct hfs_bnode *node)\n{\n\tif (node) {\n \t\t\u003cskipped\u003e\n \t\tBUG_ON(!atomic_read(&node-\u003erefcnt)); \u003c- we have issue here!!!!\n \t\t\u003cskipped\u003e\n \t}\n}\n\nBy tracing the refcnt, I found the node is created by hfs_bmap_alloc()\nwith refcnt 1.  Then the node is used by hfs_btree_write().  There is a\nmissing of hfs_bnode_get() after find the node.  The issue happened in\nfollowing path:\n\n\u003calloc\u003e\n hfs_bmap_alloc\n   hfs_bnode_find\n     __hfs_bnode_create   \u003c- allocate a new node with refcnt 1.\n   hfs_bnode_put          \u003c- decrease the refcnt\n\n\u003cwrite\u003e\n hfs_btree_write\n   hfs_bnode_find\n     __hfs_bnode_create\n       hfs_bnode_findhash \u003c- find the node without refcnt increased.\n   hfs_bnode_put\t  \u003c- trigger the BUG_ON() since refcnt is 0.","modified":"2026-04-02T09:45:25.944480Z","published":"2025-12-09T01:30:30.902Z","related":["SUSE-SU-2026:0263-1","SUSE-SU-2026:0316-1","SUSE-SU-2026:0317-1","SUSE-SU-2026:0411-1","SUSE-SU-2026:0617-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53862.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/062af3e9930762d1fd22946748d34e0d859e4a8e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2cab8db14566cf6a516c1f103a60cf6b7f54b1e5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/38d72e6604b9f96dffcc0565090cc01622a37b2a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3a9065a33988c02789722be612f7c42fb8ebbb22"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8140cdc57bc5844cd5e1392673ec2dbf8fdc6940"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a9dc087fd3c484fd1ed18c5efb290efaaf44ce03"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dc9f78b6d254427a06e568f2887b1011ef3143ef"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eda6879272e4df5456afc36642052ea066f58410"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53862.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53862"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"},{"fixed":"062af3e9930762d1fd22946748d34e0d859e4a8e"},{"fixed":"3a9065a33988c02789722be612f7c42fb8ebbb22"},{"fixed":"eda6879272e4df5456afc36642052ea066f58410"},{"fixed":"dc9f78b6d254427a06e568f2887b1011ef3143ef"},{"fixed":"2cab8db14566cf6a516c1f103a60cf6b7f54b1e5"},{"fixed":"8140cdc57bc5844cd5e1392673ec2dbf8fdc6940"},{"fixed":"38d72e6604b9f96dffcc0565090cc01622a37b2a"},{"fixed":"a9dc087fd3c484fd1ed18c5efb290efaaf44ce03"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53862.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.12"},{"fixed":"4.14.308"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.276"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.235"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.173"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.99"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.16"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.2.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53862.json"}}],"schema_version":"1.7.5"}