CVE-2026-93286 net: appletalk: fix NULL pointer dereference in aarp_send_ddp()
A local attacker can cause a kernel crash by sending AppleTalk packets on a device without an AppleTalk interface configured.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93286?
CVE-2026-93286 is a vulnerability in Linux, published on 24 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: appletalk: fix NULL pointer dereference in aarp_send_ddp()
aarp_send_ddp() calls atalk_find_dev_addr(dev) in the LocalTalk fast path without checking for NULL. When the device has no AppleTalk interface configured (dev->atalk_ptr == NULL), this leads to a NULL pointer dereference at the at->s_net access.
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:aarp_send_ddp (net/appletalk/aarp.c:552 (discriminator 2)) Call Trace: <TASK> atalk_sendmsg (net/appletalk/ddp.c:1715) __sys_sendto (net/socket.c:2265 (discriminator 1)) __x64_sys_sendto (net/socket.c:2272) do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
Add a NULL check consistent with the other callers of atalk_find_dev_addr().
Which versions are affected by CVE-2026-93286?
How do I fix CVE-2026-93286?
Apply the vendor's patch.
Is CVE-2026-93286 being exploited?
There is no known exploitation of CVE-2026-93286 in the wild and no public exploit code.
Sources
Also known as AZL-103676, BELL-CVE-2026-93286, DEBIAN-CVE-2026-93286, GHSA-5c3g-6x24-pwp4, UBUNTU-CVE-2026-93286.