GHSA-5C3G-6X24-PWP4
Vulnerability from github – Published: 2026-09-24 18:31 – Updated: 2026-09-24 18:31In 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: 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": [],
"aliases": [
"CVE-2026-93286"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-24T17:17:09Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: appletalk: fix NULL pointer dereference in aarp_send_ddp()\n\naarp_send_ddp() calls atalk_find_dev_addr(dev) in the LocalTalk fast\npath without checking for NULL. When the device has no AppleTalk\ninterface configured (dev-\u003eatalk_ptr == NULL), this leads to a NULL\npointer dereference at the at-\u003es_net access.\n\n KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n RIP: 0010:aarp_send_ddp (net/appletalk/aarp.c:552 (discriminator 2))\n Call Trace:\n \u003cTASK\u003e\n atalk_sendmsg (net/appletalk/ddp.c:1715)\n __sys_sendto (net/socket.c:2265 (discriminator 1))\n __x64_sys_sendto (net/socket.c:2272)\n do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n\nAdd a NULL check consistent with the other callers of\natalk_find_dev_addr().",
"id": "GHSA-5c3g-6x24-pwp4",
"modified": "2026-09-24T18:31:28Z",
"published": "2026-09-24T18:31:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93286"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/83899a056aeb120898a6e3a989971fc63e274e2e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8fc30f0cdf4207a5aa2341c0a98d0f1713b3ce2c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9e7f36ab5b7bf68463faa5f7b926fea8f35597bb"
}
],
"schema_version": "1.4.0",
"severity": []
}
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