CVE-2026-80846 (GCVE-0-2026-80846)
Vulnerability from cvelistv5
Published
2026-09-04 15:54
Modified
2026-09-04 15:54
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
xfrm: drop ESP-in-TCP packets with no ingress device
ESP-in-TCP receives records through the TCP strparser. handle_esp()
restores skb->dev from the saved skb_iif before passing the packet into
the XFRM input path.
Queued TCP data can be processed after the original ingress device has
been removed, for example during veth or net namespace teardown. In that
case dev_get_by_index_rcu() returns NULL. The XFRM IPv4 and IPv6 input
paths both expect skb->dev to be valid while building the route lookup,
so queued ESP-in-TCP data can dereference a NULL device.
Drop the packet if the saved ingress device can no longer be resolved.
Such a packet can no longer be routed through the normal XFRM receive
path, and this preserves the existing behaviour for packets whose ingress
device still exists.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 |
||
{
"containers": {
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"product": "Linux",
"programFiles": [
"net/xfrm/espintcp.c"
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"version": "5.6"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.269",
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},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.220",
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},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.187",
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},
{
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"version": "6.6.156",
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},
{
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},
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},
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"status": "unaffected",
"version": "7.2.3",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: drop ESP-in-TCP packets with no ingress device\n\nESP-in-TCP receives records through the TCP strparser. handle_esp()\nrestores skb-\u003edev from the saved skb_iif before passing the packet into\nthe XFRM input path.\n\nQueued TCP data can be processed after the original ingress device has\nbeen removed, for example during veth or net namespace teardown. In that\ncase dev_get_by_index_rcu() returns NULL. The XFRM IPv4 and IPv6 input\npaths both expect skb-\u003edev to be valid while building the route lookup,\nso queued ESP-in-TCP data can dereference a NULL device.\n\nDrop the packet if the saved ingress device can no longer be resolved.\nSuch a packet can no longer be routed through the normal XFRM receive\npath, and this preserves the existing behaviour for packets whose ingress\ndevice still exists."
}
],
"providerMetadata": {
"dateUpdated": "2026-09-04T15:54:56.492Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/239d0f71af09dc2029fd4d730cb24b8c83aaa43a"
},
{
"url": "https://git.kernel.org/stable/c/f00235f9d12301183d61f75fbe4105506f3e5140"
},
{
"url": "https://git.kernel.org/stable/c/6af5cdb03819a5ce6e945992635c6c5e91045367"
},
{
"url": "https://git.kernel.org/stable/c/2dd1609cadff46c4b20ce53b91ab9cce1380456a"
},
{
"url": "https://git.kernel.org/stable/c/c296d25efbc840be24de83f56d43bc47e714ace9"
},
{
"url": "https://git.kernel.org/stable/c/328e40aa774b446969c69b654c52a051a95af8a1"
},
{
"url": "https://git.kernel.org/stable/c/7911e0236616487b89db6bd3ba3f408abd10eb23"
},
{
"url": "https://git.kernel.org/stable/c/943d95233b8b4a88994e244fcf466f8c403d63f1"
},
{
"url": "https://git.kernel.org/stable/c/e1d7c5ac1c246ce5775f604515de0a59fbf2116e"
}
],
"title": "xfrm: drop ESP-in-TCP packets with no ingress device",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80846",
"datePublished": "2026-09-04T15:54:56.492Z",
"dateReserved": "2026-08-26T14:34:25.797Z",
"dateUpdated": "2026-09-04T15:54:56.492Z",
"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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