netfilter: nfnetlink_log: cope with concurrent instance destruction
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.2%
exploitation probability
0.2%top 91% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nfnetlink_log: cope with concurrent instance destruction
Instances are refcounted. However, only memory release happens on the
1 -> 0 transition; the unlink from hashes can occur with any refcount.
Uncooperative userspace can force a situation where a queue is pending
for destruction from netlink event while a different socket with same
portid processes an UNBIND request.
With right timing, this will unhash the instance again:
Oops: general protection fault, [..]
Call Trace:
<TASK>
nfulnl_recv_config+0x31a/0xd50
nfnetlink_rcv_msg+0x7c2/0xeb0
Affected products
Linux · Linux