neigh: let neigh_xmit take skb ownership
In the Linux kernel, the following vulnerability has been resolved: neigh: let neigh_xmit take skb ownership neigh_xmit always releases the skb, except when no neighbour table is found. But even the first added user of neigh_xmit (mpls) relied on neigh_xmit to release the skb (or queue it for tx). sashiko reported: If neigh_xmit() is called with an uninitialized neighbor table (for example, NEIGH_ND_TABLE when IPv6 is disabled), it returns -EAFNOSUPPORT and bypasses its internal out_kfree_skb error path. Because the return value of neigh_xmit() is ignored here, does this leak the SKB? Assume full ownership and remove the last code path that doesn't xmit or free skb.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 6.1.175, 6.12.91, 6.18.33, 6.6.141, 7.0.10
- CVEs
- CVE-2026-52981
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 03:07 UTC · Revision 1
Source evidence
In the Linux kernel, the following vulnerability has been resolved: neigh: let neigh_xmit take skb ownership neigh_xmit always releases the skb, except when no neighbour table is found. But even the first added user of neigh_xmit (mpls) relied on neigh_xmit to release the skb (or queue it for tx). sashiko reported: If neigh_xmit() is called with an uninitialized neighbor table (for example, NEIGH_ND_TABLE when IPv6 is disabled), it returns -EAFNOSUPPORT and bypasses its internal out_kfree_skb error path. Because the return value of neigh_xmit() is ignored here, does this leak the SKB? Assume full ownership and remove the last code path that doesn't xmit or free skb.
osv:CVE-2026-52981
Kernel
Fixed versions: 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10
Complete source record
{
"id": "80c145d471640ff872f5f6689fa26c556704c75771fa175fc67eae7d3d5d318c",
"url": "https://osv.dev/vulnerability/CVE-2026-52981",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "neigh: let neigh_xmit take skb ownership",
"summary": "In the Linux kernel, the following vulnerability has been resolved: neigh: let neigh_xmit take skb ownership neigh_xmit always releases the skb, except when no neighbour table is found. But even the first added user of neigh_xmit (mpls) relied on neigh_xmit to release the skb (or queue it for tx). sashiko reported: If neigh_xmit() is called with an uninitialized neighbor table (for example, NEIGH_ND_TABLE when IPv6 is disabled), it returns -EAFNOSUPPORT and bypasses its internal out_kfree_skb error path. Because the return value of neigh_xmit() is ignored here, does this leak the SKB? Assume full ownership and remove the last code path that doesn't xmit or free skb.",
"evidence": "osv:CVE-2026-52981",
"products": [
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"evidence": "/affected/1/ranges"
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{
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{
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"severity": "high",
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"aliases": [
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"package": {
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],
"modified": "2026-10-28T02:30:49.184090804Z",
"provider": "osv",
"references": [
"https://git.kernel.org/stable/c/0084712e0bee204b284510cdb63182fd5a30c2b7",
"https://git.kernel.org/stable/c/4438113be604ee67a7bf4f81da6e1cca41332ce4",
"https://git.kernel.org/stable/c/445e45a2c3a078316a62d2d331a570cf34ef5079",
"https://git.kernel.org/stable/c/63063ba60d2dc334e34f1e3f9271d7f3f6f30307",
"https://git.kernel.org/stable/c/8a89054a1ec0767aec25ed2bbac933da6ba3cf5a",
"https://git.kernel.org/stable/c/9247d59ca15bf60a57dca08103f055d8a4340877",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52981.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-52981",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
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"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52981.json"
}
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"related_cves": [
{
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 517625,
"published_at": "2026-06-24T16:28:57.074+00:00"
}