CVE-2026-74725 (GCVE-0-2026-74725)
Vulnerability from cvelistv5
Published
2026-08-22 15:33
Modified
2026-08-25 05:42
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
enic: fix tx_hang_reset use-after-free on device removal
enic_remove() cancels the reset and change_mtu_work items but does not
cancel tx_hang_reset. A TX timeout that fires while the device is being
removed can schedule enic_tx_hang_reset() so that it runs after
free_netdev(), resulting in a use-after-free.
cancel_work_sync() alone is not sufficient here: the still-live watchdog
and notify paths can re-schedule these work items in the window between
the cancel and unregister_netdev(). Use disable_work_sync(), which
cancels the work and blocks any subsequent schedule_work() from
requeuing it, and apply it to the reset and change_mtu_work items as
well so the same requeue race is closed for all teardown work.
References
| URL | Tags | |
|---|---|---|
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/cisco/enic/enic_main.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "8619865f34fb3b130b567855382a5c4aadd522b9",
"status": "affected",
"version": "937317c7c1097aa878a5000e3aab616eb5c590c0",
"versionType": "git"
},
{
"lessThan": "e506e704b74748ffd0e1c92a7453ca2a959f832b",
"status": "affected",
"version": "937317c7c1097aa878a5000e3aab616eb5c590c0",
"versionType": "git"
},
{
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"status": "affected",
"version": "937317c7c1097aa878a5000e3aab616eb5c590c0",
"versionType": "git"
},
{
"lessThan": "ec680ea4ba1bca92a767fb7e7869758bfdd886e3",
"status": "affected",
"version": "937317c7c1097aa878a5000e3aab616eb5c590c0",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/cisco/enic/enic_main.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.4"
},
{
"lessThan": "4.4",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.9",
"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": "6.12.104",
"versionStartIncluding": "4.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.45",
"versionStartIncluding": "4.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.9",
"versionStartIncluding": "4.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "4.4",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nenic: fix tx_hang_reset use-after-free on device removal\n\nenic_remove() cancels the reset and change_mtu_work items but does not\ncancel tx_hang_reset. A TX timeout that fires while the device is being\nremoved can schedule enic_tx_hang_reset() so that it runs after\nfree_netdev(), resulting in a use-after-free.\n\ncancel_work_sync() alone is not sufficient here: the still-live watchdog\nand notify paths can re-schedule these work items in the window between\nthe cancel and unregister_netdev(). Use disable_work_sync(), which\ncancels the work and blocks any subsequent schedule_work() from\nrequeuing it, and apply it to the reset and change_mtu_work items as\nwell so the same requeue race is closed for all teardown work."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The UAF occurs during enic_remove() PCI/driver teardown (sysfs unbind, rmmod, or hot-unplug); TX timeout is raised by the local netdev watchdog, not by remote packet processing, and there is no standalone network path into enic_remove itself.\nAC:L - This is a workqueue race during removal: once teardown starts the netdev can still be up so the watchdog schedules enic_tx_hang_reset, and an attacker can reliably drive TX timeout by stalling or flooding xmit on the still-registered interface while removal proceeds.\nPR:L - PCI unbind/module unload needs elevated privileges, but an unprivileged local or tenant workload can supply the concurrent netdev watchdog TX timeout (local/remote traffic on the Cisco VIC uplink) that schedules tx_hang_reset; per driver-removal UAF precedent, PR:L.\nUI:N - No victim interaction is required beyond routine driver removal, module unload, or hypervisor VNIC hot-unplug; monitoring and network traffic on the live interface can schedule tx_hang_reset during teardown without cooperation.\nS:U - Impact is use-after-free of netdev_priv enic memory in the host/guest kernel, enabling crash or privilege escalation within the same kernel security authority; it does not cross VM, hypervisor, IOMMU, or container boundaries.\nC:H - enic_tx_hang_reset dereferences freed enic/netdev memory via container_of(work, struct enic, tx_hang_reset); UAF on the unified netdev slab enables arbitrary kernel memory disclosure once the object is reallocated.\nI:H - The scheduled work performs hang reset, stop/open, and notifier calls through the dangling enic pointer, giving attacker-influenced writes and control-flow hijack primitives typical of netdev driver UAF exploitation.\nA:H - Use-after-free during enic_tx_hang_reset reliably causes kernel oops/panic when the work runs after free_netdev(), and even attempted exploitation crashes the system on dangling enic/netdev accesses."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-25T05:42:05.934Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/8619865f34fb3b130b567855382a5c4aadd522b9"
},
{
"url": "https://git.kernel.org/stable/c/e506e704b74748ffd0e1c92a7453ca2a959f832b"
},
{
"url": "https://git.kernel.org/stable/c/4f3464fc6c1f26afc504fd525c574f2bc14c9d42"
},
{
"url": "https://git.kernel.org/stable/c/ec680ea4ba1bca92a767fb7e7869758bfdd886e3"
}
],
"title": "enic: fix tx_hang_reset use-after-free on device removal",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74725",
"datePublished": "2026-08-22T15:33:16.460Z",
"dateReserved": "2026-08-15T05:44:03.929Z",
"dateUpdated": "2026-08-25T05:42:05.934Z",
"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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