CVE-2026-72463
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: Fix dev use-after-free in xfrm async resumption xfrm async resumption hold skb->dev refcnt until after transport_finish. However, xfrm_rcv_cb may modify skb->dev to tunnel dev without taking device reference, such as vti_rcv_cb. The subsequent async resumption will decrement the tunnel device's reference count, which lead to uaf of tunnel dev and refcnt leak of orig dev as below: unregister_netdevice: waiting for vti1 to become free. Usage count = -2 Stash the original skb->dev to fix refcnt imbalance. The new skb->dev set by xfrm_rcv_cb can race with device teardown. Extend rcu protection over xfrm_rcv_cb and transport_finish to prevent races.
Severity
CRITICAL
CVSS score
9.8
(v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-08-15 06:22:20.303000
Last modified
2026-10-30 13:19:52.740000
View original CVE JSON
{
"id": "CVE-2026-72463",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-08-15T06:22:20.303",
"lastModified": "2026-10-30T13:19:52.740",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Fix dev use-after-free in xfrm async resumption\n\nxfrm async resumption hold skb->dev refcnt until after transport_finish.\nHowever, xfrm_rcv_cb may modify skb->dev to tunnel dev without taking\ndevice reference, such as vti_rcv_cb. The subsequent async resumption\nwill decrement the tunnel device's reference count, which lead to uaf\nof tunnel dev and refcnt leak of orig dev as below:\n\nunregister_netdevice: waiting for vti1 to become free. Usage count = -2\n\nStash the original skb->dev to fix refcnt imbalance. The new skb->dev set\nby xfrm_rcv_cb can race with device teardown. Extend rcu protection over\nxfrm_rcv_cb and transport_finish to prevent races."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"net/ipv4/xfrm4_input.c",
"net/ipv6/xfrm6_input.c",
"net/xfrm/xfrm_input.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "4236c30b437b80f673b9e08c8fae38b8d471ac9e",
"lessThan": "fed4d3195a31125566876952ce66113ec1eb9008",
"versionType": "git",
"status": "affected"
},
{
"version": "0f451b43c88bf2b9c038b414be580efee42e031b",
"lessThan": "1acd93259b6be269e26be5d71c224bccd1f8352f",
"versionType": "git",
"status": "affected"
},
{
"version": "1c428b03840094410c5fb6a5db30640486bbbfcb",
"lessThan": "63a30015199912bd5055bead8001b1ae68a67cdb",
"versionType": "git",
"status": "affected"
},
{
"version": "1c428b03840094410c5fb6a5db30640486bbbfcb",
"lessThan": "8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff",
"versionType": "git",
"status": "affected"
},
{
"version": "4d06caedea587c59cc2cc893ceecc57c75c64312",
"versionType": "git",
"status": "affected"
},
{
"version": "94439cbe478b53f92223da9aae95fffb28623c3f",
"versionType": "git",
"status": "affected"
},
{
"version": "5002beda5cac69d522dc54da0d5d463ed9c963d2",
"versionType": "git",
"status": "affected"
},
{
"version": "6.12.94",
"lessThan": "6.12.112",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.18.23",
"lessThan": "6.18.54",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.1.191",
"lessThan": "6.2",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.6.160",
"lessThan": "6.7",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.19.13",
"lessThan": "6.20",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"net/ipv4/xfrm4_input.c",
"net/ipv6/xfrm6_input.c",
"net/xfrm/xfrm_input.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "7.0",
"status": "affected"
},
{
"version": "0",
"lessThan": "7.0",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.112",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.54",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.1.5",
"lessThanOrEqual": "7.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 3.9,
"impactScore": 5.9
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/1acd93259b6be269e26be5d71c224bccd1f8352f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/63a30015199912bd5055bead8001b1ae68a67cdb",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/fed4d3195a31125566876952ce66113ec1eb9008",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}