CVE-2026-100080
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: xen-netback: Fix UAF when reading statistics data The network statistic data in the driver is protected by RCU. Unfortunately when tearing down the queues after an error during connecting to the frontend (e.g. due to illegal Xenstore data filled in by the guest), the statistic data is being freed without synchronizing the RCU state. In case the data is being read via sysfs in this phase, access to already freed memory or memory being in new use is possible. Fix that by calling synchronize_net() before freeing the queue data. This is XSA-526 / CVE-2026-100080
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-11-06 19:17:03.190000
Last modified
2026-11-06 19:17:03.190000
View original CVE JSON
{
"id": "CVE-2026-100080",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-11-06T19:17:03.190",
"lastModified": "2026-11-06T19:17:03.190",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen-netback: Fix UAF when reading statistics data\n\nThe network statistic data in the driver is protected by RCU.\nUnfortunately when tearing down the queues after an error during\nconnecting to the frontend (e.g. due to illegal Xenstore data filled\nin by the guest), the statistic data is being freed without\nsynchronizing the RCU state. In case the data is being read via sysfs\nin this phase, access to already freed memory or memory being in new\nuse is possible.\n\nFix that by calling synchronize_net() before freeing the queue data.\n\nThis is XSA-526 / CVE-2026-100080"
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/net/xen-netback/xenbus.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "4223b33be49ee09acb6f1d26beb4a36dd3b8d63a",
"versionType": "git",
"status": "affected"
},
{
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"status": "affected"
},
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{
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{
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]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/net/xen-netback/xenbus.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "5.10.274",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
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"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
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"versionType": "semver",
"status": "unaffected"
},
{
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},
{
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},
{
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},
{
"version": "7.3.3",
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"versionType": "semver",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ab9cdf1291be551da999510b30216a2886074d7a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/11/06/9",
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "http://xenbits.xen.org/xsa/advisory-526.html",
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
]
}