CriticalFix available
udp: fix potential use-after-free in tunnel segmentation
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: udp: fix potential use-after-free in tunnel segmentation __skb_udp_tunnel_segment() gets the UDP header before ensuring the tunnel header is in the skb head. If the pull reallocates skb->head, the saved UDP header pointer is no longer valid. Get the UDP header after the pull to avoid a potential use-after-free.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.265, 5.15.216, 6.1.183, 6.12.104, 6.18.45, 6.6.152, 7.1.9
- CVEs
- CVE-2026-74705
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 01:40 UTC · Revision 1
Source evidence
udp: fix potential use-after-free in tunnel segmentation
core-osv · Original sourcePublished 22 Aug 2026, 15:33 UTC
In the Linux kernel, the following vulnerability has been resolved: udp: fix potential use-after-free in tunnel segmentation __skb_udp_tunnel_segment() gets the UDP header before ensuring the tunnel header is in the skb head. If the pull reallocates skb->head, the saved UDP header pointer is no longer valid. Get the UDP header after the pull to avoid a potential use-after-free.
osv:CVE-2026-74705
Kernel
Fixed versions: 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9
Complete source record
{
"id": "6226def024843a936a4435023410be950965f5aa3e954475ba47511263493f79",
"url": "https://osv.dev/vulnerability/CVE-2026-74705",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "udp: fix potential use-after-free in tunnel segmentation",
"summary": "In the Linux kernel, the following vulnerability has been resolved: udp: fix potential use-after-free in tunnel segmentation __skb_udp_tunnel_segment() gets the UDP header before ensuring the tunnel header is in the skb head. If the pull reallocates skb->head, the saved UDP header pointer is no longer valid. Get the UDP header after the pull to avoid a potential use-after-free.",
"evidence": "osv:CVE-2026-74705",
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"aliases": [
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"package": {
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"modified": "2026-10-28T02:30:25.093978121Z",
"provider": "osv",
"references": [
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"https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe",
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"https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442",
"https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74705.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-74705",
"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/2026/74xxx/CVE-2026-74705.json"
}
},
"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": 491691,
"published_at": "2026-08-22T15:33:04.11+00:00"
}