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CVE-2025-37824

Description

In the Linux kernel, the following vulnerability has been resolved:tipc: fix NULL pointer dereference in tipc_mon_reinit_self()syzbot reported:tipc: Node number set to 1055423674Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTIKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]CPU: 3 UID: 0 PID: 6017 Comm: kworker/3:5 Not tainted 6.15.0-rc1-syzkaller-00246-g900241a5cc15 #0 PREEMPT(full)Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014Workqueue: events tipc_net_finalize_workRIP: 0010:tipc_mon_reinit_self+0x11c/0x210 net/tipc/monitor.c:719...RSP: 0018:ffffc9000356fb68 EFLAGS: 00010246RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000003ee87cbaRDX: 0000000000000000 RSI: ffffffff8dbc56a7 RDI: ffff88804c2cc010RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000007R13: fffffbfff2111097 R14: ffff88804ead8000 R15: ffff88804ead9010FS: 0000000000000000(0000) GS:ffff888097ab9000(0000) knlGS:0000000000000000CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 00000000f720eb00 CR3: 000000000e182000 CR4: 0000000000352ef0DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400Call Trace: tipc_net_finalize+0x10b/0x180 net/tipc/net.c:140 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ...RIP: 0010:tipc_mon_reinit_self+0x11c/0x210 net/tipc/monitor.c:719...RSP: 0018:ffffc9000356fb68 EFLAGS: 00010246RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000003ee87cbaRDX: 0000000000000000 RSI: ffffffff8dbc56a7 RDI: ffff88804c2cc010RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000007R13: fffffbfff2111097 R14: ffff88804ead8000 R15: ffff88804ead9010FS: 0000000000000000(0000) GS:ffff888097ab9000(0000) knlGS:0000000000000000CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 00000000f720eb00 CR3: 000000000e182000 CR4: 0000000000352ef0DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400There is a racing condition between workqueue created when enablingbearer and another thread created when disabling bearer right afterthat as follow:enabling_bearer | disabling_bearer--------------- | ----------------tipc_disc_timeout() |{ | bearer_disable() ... | { schedule_work(&tn->work); | tipc_mon_delete() ... | {} | ... | write_lock_bh(&mon->lock); | mon->self = NULL; | write_unlock_bh(&mon->lock); | ... | }tipc_net_finalize_work() | }{ | ... | tipc_net_finalize() | { | ... | tipc_mon_reinit_self() | { | ... | write_lock_bh(&mon->lock); | mon->self->addr = tipc_own_addr(net); | write_unlock_bh(&mon->lock); | ... ---truncated---

POC

Reference

No PoCs from references.

Github

- https://github.com/w4zu/Debian_security