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ubuntucveUbuntu.comUB:CVE-2024-36286
HistoryJun 25, 2024 - 12:00 a.m.

CVE-2024-36286

2024-06-2500:00:00
ubuntu.com
ubuntu.com
linux kernel
netfilter
nfnetlink_queue
vulnerability
cve-2024-36286
improper rcu usage

7 High

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.2%

In the Linux kernel, the following vulnerability has been resolved:
netfilter: nfnetlink_queue: acquire rcu_read_lock() in
instance_destroy_rcu()
syzbot reported that nf_reinject() could be called without rcu_read_lock()
:
WARNING: suspicious RCU usage
6.9.0-rc7-syzkaller-02060-g5c1672705a1a #0 Not tainted
net/netfilter/nfnetlink_queue.c:263 suspicious rcu_dereference_check()
usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
2 locks held by syz-executor.4/13427:
#0: ffffffff8e334f60 (rcu_callback){…}-{0:0}, at: rcu_lock_acquire
include/linux/rcupdate.h:329 [inline]
#0: ffffffff8e334f60 (rcu_callback){…}-{0:0}, at: rcu_do_batch
kernel/rcu/tree.c:2190 [inline]
#0: ffffffff8e334f60 (rcu_callback){…}-{0:0}, at:
rcu_core+0xa86/0x1830 kernel/rcu/tree.c:2471
#1: ffff88801ca92958 (&inst->lock){+.-.}-{2:2}, at: spin_lock_bh
include/linux/spinlock.h:356 [inline]
#1: ffff88801ca92958 (&inst->lock){+.-.}-{2:2}, at: nfqnl_flush
net/netfilter/nfnetlink_queue.c:405 [inline]
#1: ffff88801ca92958 (&inst->lock){+.-.}-{2:2}, at:
instance_destroy_rcu+0x30/0x220 net/netfilter/nfnetlink_queue.c:172
stack backtrace:
CPU: 0 PID: 13427 Comm: syz-executor.4 Not tainted
6.9.0-rc7-syzkaller-02060-g5c1672705a1a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 04/02/2024
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
lockdep_rcu_suspicious+0x221/0x340 kernel/locking/lockdep.c:6712
nf_reinject net/netfilter/nfnetlink_queue.c:323 [inline]
nfqnl_reinject+0x6ec/0x1120 net/netfilter/nfnetlink_queue.c:397
nfqnl_flush net/netfilter/nfnetlink_queue.c:410 [inline]
instance_destroy_rcu+0x1ae/0x220 net/netfilter/nfnetlink_queue.c:172
rcu_do_batch kernel/rcu/tree.c:2196 [inline]
rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2471
handle_softirqs+0x2d6/0x990 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043
[inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
</IRQ>
<TASK>

7 High

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.2%