CVE-2026-80681 (GCVE-0-2026-80681)
Vulnerability from cvelistv5
Published
2026-08-28 06:52
Modified
2026-08-29 06:22
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
vxlan: re-fetch eth header after route_shortcircuit()
Before route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb).
Inside route_shortcircuit(), pskb_may_pull() can be called, which may
reallocate skb->head.
In this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to
freed memory, leading to a use-after-free when dereferencing eth->h_dest.
Fix this by updating eth = eth_hdr(skb) after calling route_shortcircuit().
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: ae8840825605f36f98f247323edc150e761cb64e Version: ae8840825605f36f98f247323edc150e761cb64e Version: ae8840825605f36f98f247323edc150e761cb64e Version: ae8840825605f36f98f247323edc150e761cb64e Version: ae8840825605f36f98f247323edc150e761cb64e Version: ae8840825605f36f98f247323edc150e761cb64e Version: ae8840825605f36f98f247323edc150e761cb64e Version: ae8840825605f36f98f247323edc150e761cb64e |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/vxlan/vxlan_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"status": "affected",
"version": "ae8840825605f36f98f247323edc150e761cb64e",
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]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/net/vxlan/vxlan_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.10"
},
{
"lessThan": "3.10",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.265",
"versionStartIncluding": "3.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.216",
"versionStartIncluding": "3.10",
"vulnerable": true
},
{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.44",
"versionStartIncluding": "3.10",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.8",
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{
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"versionEndExcluding": "7.2",
"versionStartIncluding": "3.10",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: re-fetch eth header after route_shortcircuit()\n\nBefore route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb).\n\nInside route_shortcircuit(), pskb_may_pull() can be called, which may\nreallocate skb-\u003ehead.\n\nIn this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to\nfreed memory, leading to a use-after-free when dereferencing eth-\u003eh_dest.\n\nFix this by updating eth = eth_hdr(skb) after calling route_shortcircuit()."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The bug is in vxlan_xmit(), reached when the kernel transmits packets out a VXLAN netdev via routing, bridging, or overlay forwarding; remote peers can inject IPv4/IPv6 Ethernet frames that traverse this TX path on cloud, Kubernetes, and data-center VXLAN deployments.\nAC:L - An attacker controlling overlay or forwarded traffic can reliably meet RSC prerequisites (router FDB entry, IPv4/IPv6 ethertype, neighbour MAC mismatch, cloned/nonlinear skb) so route_shortcircuit() calls pskb_may_pull/skb_cow_head and reallocates skb-\u003ehead, invalidating the cached eth pointer.\nPR:N - Exploitation requires only sending network traffic processed by an existing VXLAN interface with RSC enabled, not host administrator credentials; remote overlay peers and unauthenticated senders whose packets are forwarded through VXLAN need no elevated privileges on the target.\nUI:N - The use-after-free is triggered automatically during kernel packet transmit processing in vxlan_xmit() with no action required from a local user or administrator beyond normal network operation on a VXLAN-enabled host.\nS:U - The stale eth_hdr pointer causes heap use-after-free within the kernel\u0027s own memory domain during VXLAN transmit processing; impact is standard in-kernel memory corruption and does not inherently cross VM, container, or IOMMU security boundaries.\nC:H - After route_shortcircuit() reallocates skb-\u003ehead, vxlan_xmit() dereferences the stale eth pointer for eth-\u003eh_dest, constituting a heap use-after-free read that can disclose adjacent freed slab contents and support further kernel memory disclosure primitives.\nI:H - Use-after-free of the Ethernet header buffer in skb head memory enables attacker-controlled reuse of freed kmalloc slabs, a well-established path to heap grooming and arbitrary kernel memory corruption or control-flow hijacking beyond the immediate MAC header read.\nA:H - Dereferencing a freed skb head pointer in vxlan_xmit() can cause an immediate kernel oops or panic from invalid memory access, and UAF heap corruption routinely destabilizes or crashes the system even when full exploitation is not pursued."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-29T06:22:07.840Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/6375093eb45cd7d89f1945f939eeae3b29d79f56"
},
{
"url": "https://git.kernel.org/stable/c/1b7f7b653e3557690047c62f03b80a24ea5a58a5"
},
{
"url": "https://git.kernel.org/stable/c/bf045341dfb3e767f0ff94cf240ce3c371973bd4"
},
{
"url": "https://git.kernel.org/stable/c/2355c8c26d2aa1b4385b369e67202e47d460d555"
},
{
"url": "https://git.kernel.org/stable/c/1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585"
},
{
"url": "https://git.kernel.org/stable/c/1235e017aa11cf01e91b613c4c5ed6aa28934fff"
},
{
"url": "https://git.kernel.org/stable/c/c9dceac9e1c7c772c43c732fc0d325e72835801a"
},
{
"url": "https://git.kernel.org/stable/c/1395a676ec15a0a02a2a6d86602324f2d5fd41d5"
}
],
"title": "vxlan: re-fetch eth header after route_shortcircuit()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80681",
"datePublished": "2026-08-28T06:52:48.896Z",
"dateReserved": "2026-08-26T14:34:25.783Z",
"dateUpdated": "2026-08-29T06:22:07.840Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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