CVE-2026-93286

Summary

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().

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/8fc30f0cdf4207a5aa2341c0a98d0f1713b3ce2c
• https://git.kernel.org/stable/c/83899a056aeb120898a6e3a989971fc63e274e2e
• https://git.kernel.org/stable/c/9e7f36ab5b7bf68463faa5f7b926fea8f35597bb

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