CVE-2026-99116 net: psp: do not inherit the Rx association on clone
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99116?
CVE-2026-99116 is a vulnerability in Linux, published on 28 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: psp: do not inherit the Rx association on clone
sk->psp_assoc sits past sk_dontcopy_end, so sock_copy() copies it into every socket accepted from a listener without taking a reference, while inet_sock_destruct() puts for every inet socket. psp_twsk_init() does refcount_inc() for the timewait socket, so a child closing through TIME_WAIT cancels its own put and leaves the association with one reference and N timewait sockets holding the same pointer. Closing the listener frees it, and the timewait timers then put freed memory.
Rejecting the association on a listening socket is not sufficient: a socket can acquire one while established and then be turned back into a listener, because tcp_disconnect() leaves sk->psp_assoc in place.
BUG: KASAN: slab-use-after-free in psp_twsk_assoc_free+0x6f/0xf0 Write of size 4 at addr ffff888110f9255c by task swapper/7/0 psp_twsk_assoc_free+0x6f/0xf0 inet_twsk_put+0xda/0x1b0 call_timer_fn+0x53/0x2e0 __run_timers+0x764/0xa80 Freed by task 99: kfree+0x1a7/0x500 process_one_work+0x7ec/0x1100
An association carries a per-connection SPI and key, so a child must not inherit the parent's. Clear it on clone.
Which versions are affected by CVE-2026-99116?
How do I fix CVE-2026-99116?
Upgrade to a fixed version.
Is CVE-2026-99116 being exploited?
There is no known exploitation of CVE-2026-99116 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-99116, DEBIAN-CVE-2026-99116, GHSA-7x5j-pq24-445m, UBUNTU-CVE-2026-99116.