CVE-2025-37824

Summary

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 1055423674 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI KASAN: 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 04/01/2014 Workqueue: events tipc_net_finalize_work RIP: 0010:tipc_mon_reinit_self+0x11c/0x210 net/tipc/monitor.c:719 … RSP: 0018:ffffc9000356fb68 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000003ee87cba RDX: 0000000000000000 RSI: ffffffff8dbc56a7 RDI: ffff88804c2cc010 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000007 R13: fffffbfff2111097 R14: ffff88804ead8000 R15: ffff88804ead9010 FS: 0000000000000000(0000) GS:ffff888097ab9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f720eb00 CR3: 000000000e182000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> 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 </TASK> … RIP: 0010:tipc_mon_reinit_self+0x11c/0x210 net/tipc/monitor.c:719 … RSP: 0018:ffffc9000356fb68 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000003ee87cba RDX: 0000000000000000 RSI: ffffffff8dbc56a7 RDI: ffff88804c2cc010 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000007 R13: fffffbfff2111097 R14: ffff88804ead8000 R15: ffff88804ead9010 FS: 0000000000000000(0000) GS:ffff888097ab9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f720eb00 CR3: 000000000e182000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

There is a racing condition between workqueue created when enabling bearer and another thread created when disabling bearer right after that as follow:

enabling_bearerdisabling_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—

Affected Software

VendorProductVersion RangeStatus
LinuxLinux28845c28f842e9e55e75b2c116bff714bb039055 < a3df56010403b2cd26388096ebccf959d23c4dccaffected
LinuxLinux46cb01eeeb86fca6afe24dda1167b0cb95424e29 < e6613b6d41f4010c4d484cbc7bfca690d8d522a2affected
LinuxLinux46cb01eeeb86fca6afe24dda1167b0cb95424e29 < 5fd464fd24de93d0eca377554bf0ff2548f76f30affected
LinuxLinux46cb01eeeb86fca6afe24dda1167b0cb95424e29 < e79e8e05aa46f90d21023f0ffe6f136ed6a20932affected
LinuxLinux46cb01eeeb86fca6afe24dda1167b0cb95424e29 < dd6cb0a8575b00fbd503e96903184125176f4fa3affected
LinuxLinux46cb01eeeb86fca6afe24dda1167b0cb95424e29 < 0ceef62a328ce1288598c9242576292671f21e96affected
LinuxLinux46cb01eeeb86fca6afe24dda1167b0cb95424e29 < 4d5e1e2d3e9d70beff7beab44fd6ce91405a405eaffected
LinuxLinux46cb01eeeb86fca6afe24dda1167b0cb95424e29 < d63527e109e811ef11abb1c2985048fdb528b4cbaffected
LinuxLinux295c9b554f6dfcd2d368fae6e6fa22ee5b79c123affected
LinuxLinux5.4.15 < 5.4.293affected
LinuxLinux4.19.99 < 4.20affected
LinuxLinux5.5affected
LinuxLinux0 < 5.5unaffected
LinuxLinux5.4.293 <= 5.4.*unaffected
LinuxLinux5.10.237 <= 5.10.*unaffected
LinuxLinux5.15.181 <= 5.15.*unaffected
LinuxLinux6.1.136 <= 6.1.*unaffected
LinuxLinux6.6.89 <= 6.6.*unaffected
LinuxLinux6.12.26 <= 6.12.*unaffected
LinuxLinux6.14.5 <= 6.14.*unaffected
LinuxLinux6.15 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References