FKIE_CVE-2026-74465
Vulnerability from fkie_nvd - Published: 2026-08-15 13:17 - Updated: 2026-08-19 17:21
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: openvswitch: fix potential UAF on meter attach failure
While attaching a newly created meter attach_meter() function makes
the new meter visible to other CPUs but can still fail afterwards.
On failure, it detaches the meter back and returns an error.
However, this is an unexpected behavior for the ovs_meter_cmd_set()
that uses a plain kfree(meter) on attach failure without waiting for
RCU readers to stop using it, assuming it was never visible.
This is never a problem for ovs-vswitchd as it always creates meters
before creating any flows that use them. But the UAF can be triggered
with a custom application using uAPI:
BUG: KASAN: slab-use-after-free in ovs_meter_execute (net/openvswitch/meter.c:653)
Read of size 8 at addr ffff88810d152650 by task meter/2508
Call Trace:
ovs_meter_execute (net/openvswitch/meter.c:653)
do_execute_actions (net/openvswitch/actions.c:1407)
ovs_execute_actions (net/openvswitch/actions.c:1584)
ovs_packet_cmd_execute (net/openvswitch/datapath.c:703)
...
netlink_sendmsg (af_netlink.c:1900)
Allocated by task 2519:
__kasan_kmalloc (mm/kasan/common.c:398 mm/kasan/common.c:415)
ovs_meter_cmd_set (net/openvswitch/meter.c:422)
...
netlink_sendmsg (af_netlink.c:1900)
Freed by task 2519:
kfree (mm/slub.c:2705 mm/slub.c:6405 mm/slub.c:6720)
ovs_meter_cmd_set (net/openvswitch/meter.c:479)
...
netlink_sendmsg (af_netlink.c:1900)
Fix that by making sure attach_meter() doesn't make the meter visible
until all the checks are done and the function can't fail anymore.
This also makes sure the "hash" value is calculated after the potential
re-sizing of the table.
Reported by Trend Micro's Zero Day Initiative as ZDI-CAN-31642.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/openvswitch/meter.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "496f3013c6ff759249abcfb2da2361c1a3e2e66d",
"status": "affected",
"version": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"versionType": "git"
},
{
"lessThan": "ddc0ef4217cc697c6ba1a295cc1ea42423ec68ac",
"status": "affected",
"version": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"versionType": "git"
},
{
"lessThan": "b0de3b58dac3b02b528f72ee0397728aed11f993",
"status": "affected",
"version": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"versionType": "git"
},
{
"lessThan": "0310d1fa7f9debd0d89629e9f14c7975a47eaa9a",
"status": "affected",
"version": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"versionType": "git"
},
{
"lessThan": "4d03e5fa3fbb1df15258a1eb3d6963f0d65659b3",
"status": "affected",
"version": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"versionType": "git"
},
{
"lessThan": "90623c9499627803ef3f04fa25a3199402d4fb95",
"status": "affected",
"version": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"versionType": "git"
},
{
"lessThan": "431a295d93f76fbdb6a7cfce92a9e3dfee1e5d61",
"status": "affected",
"version": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"versionType": "git"
},
{
"lessThan": "a58a2b0ce354df531ebc71fc870058c2feb59f6b",
"status": "affected",
"version": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/openvswitch/meter.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.8"
},
{
"lessThan": "5.8",
"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"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: openvswitch: fix potential UAF on meter attach failure\n\nWhile attaching a newly created meter attach_meter() function makes\nthe new meter visible to other CPUs but can still fail afterwards.\nOn failure, it detaches the meter back and returns an error.\n\nHowever, this is an unexpected behavior for the ovs_meter_cmd_set()\nthat uses a plain kfree(meter) on attach failure without waiting for\nRCU readers to stop using it, assuming it was never visible.\n\nThis is never a problem for ovs-vswitchd as it always creates meters\nbefore creating any flows that use them. But the UAF can be triggered\nwith a custom application using uAPI:\n\n BUG: KASAN: slab-use-after-free in ovs_meter_execute (net/openvswitch/meter.c:653)\n Read of size 8 at addr ffff88810d152650 by task meter/2508\n\n Call Trace:\n ovs_meter_execute (net/openvswitch/meter.c:653)\n do_execute_actions (net/openvswitch/actions.c:1407)\n ovs_execute_actions (net/openvswitch/actions.c:1584)\n ovs_packet_cmd_execute (net/openvswitch/datapath.c:703)\n ...\n netlink_sendmsg (af_netlink.c:1900)\n\n Allocated by task 2519:\n __kasan_kmalloc (mm/kasan/common.c:398 mm/kasan/common.c:415)\n ovs_meter_cmd_set (net/openvswitch/meter.c:422)\n ...\n netlink_sendmsg (af_netlink.c:1900)\n\n Freed by task 2519:\n kfree (mm/slub.c:2705 mm/slub.c:6405 mm/slub.c:6720)\n ovs_meter_cmd_set (net/openvswitch/meter.c:479)\n ...\n netlink_sendmsg (af_netlink.c:1900)\n\nFix that by making sure attach_meter() doesn\u0027t make the meter visible\nuntil all the checks are done and the function can\u0027t fail anymore.\n\nThis also makes sure the \"hash\" value is calculated after the potential\nre-sizing of the table.\n\nReported by Trend Micro\u0027s Zero Day Initiative as ZDI-CAN-31642."
}
],
"id": "CVE-2026-74465",
"lastModified": "2026-08-19T17:21:03.497",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-15T13:17:51.190",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0310d1fa7f9debd0d89629e9f14c7975a47eaa9a"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/431a295d93f76fbdb6a7cfce92a9e3dfee1e5d61"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/496f3013c6ff759249abcfb2da2361c1a3e2e66d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/4d03e5fa3fbb1df15258a1eb3d6963f0d65659b3"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/90623c9499627803ef3f04fa25a3199402d4fb95"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a58a2b0ce354df531ebc71fc870058c2feb59f6b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b0de3b58dac3b02b528f72ee0397728aed11f993"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ddc0ef4217cc697c6ba1a295cc1ea42423ec68ac"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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