CVE-2026-72345 (GCVE-0-2026-72345)
Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:43
VLAI
EPSS
VEX
Title
net/mlx5: LAG, Fix off-by-one in single-FDB error rollback
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/mlx5: LAG, Fix off-by-one in single-FDB error rollback
On failure at index i, the reverse cleanup loop in
mlx5_lag_create_single_fdb() starts from i, so the failed index
itself is rolled back. That can operate on uninitialized state or
double-tear-down a rule the add_one path already self-rolled-back.
Start the rollback from i - 1 so only successfully-installed entries
are undone.
Severity
7.8 (High)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ddbb5ddc43ad000a984149db5af1133433938404 , < 40cc06bf71476932e5d139fa326dcd0372766e16
(git)
Affected: ddbb5ddc43ad000a984149db5af1133433938404 , < 0f0e4ae6975c773f7854fc48932a267f6c79088f (git) |
guessed | |
| Linux | Linux |
Affected:
6.14
Unaffected: 0 , < 6.14 (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/mellanox/mlx5/core/lag/shared_fdb.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "40cc06bf71476932e5d139fa326dcd0372766e16",
"status": "affected",
"version": "ddbb5ddc43ad000a984149db5af1133433938404",
"versionType": "git"
},
{
"lessThan": "0f0e4ae6975c773f7854fc48932a267f6c79088f",
"status": "affected",
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"versionType": "git"
}
]
},
{
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"product": "Linux",
"programFiles": [
"drivers/net/ethernet/mellanox/mlx5/core/lag/shared_fdb.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.14"
},
{
"lessThan": "6.14",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"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": "7.1.5",
"versionStartIncluding": "6.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "6.14",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: LAG, Fix off-by-one in single-FDB error rollback\n\nOn failure at index i, the reverse cleanup loop in\nmlx5_lag_create_single_fdb() starts from i, so the failed index\nitself is rolled back. That can operate on uninitialized state or\ndouble-tear-down a rule the add_one path already self-rolled-back.\n\nStart the rollback from i - 1 so only successfully-installed entries\nare undone."
}
],
"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 bug is only reachable when mlx5 shared-FDB LAG setup runs via local admin paths (bond netdev notifier or devlink esw_multiport), not from remote packet handling on the mlx5 data path.\nAC:L - An attacker with CAP_NET_ADMIN can trigger bonding/MPESW setup and retry until mlx5_eswitch_offloads_single_fdb_add_one fails, reliably exercising the faulty rollback loop without uncontrollable timing or layout dependencies.\nPR:L - Exploitation requires configuring bonding or devlink eswitch parameters, which needs CAP_NET_ADMIN; per kernel CNA guidance this is Low because that capability is obtainable inside unprivileged user namespaces.\nUI:N - No end-user interaction is required beyond the attacker (or their privileged account) performing the LAG/shared-FDB configuration that reaches mlx5_lag_create_single_fdb().\nS:U - Impact is confined to kernel mlx5 eswitch/LAG state on the host; it does not cross a VM, container, or IOMMU security boundary into another authority.\nC:H - The off-by-one rollback can tear down uninitialized or already-cleared eswitch flow/FDB state, causing memory corruption that can be leveraged for kernel information disclosure beyond a simple crash.\nI:H - Double teardown of master egress bounce rules and slave root FDB entries can corrupt mlx5 steering structures and heap metadata, enabling arbitrary kernel writes or control-flow hijacking.\nA:H - Incorrect rollback of failed single-FDB installs can panic the kernel or leave eswitch offload state inconsistent, causing oops, hang, or denial of service on affected Mellanox hosts."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:43:04.347Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/40cc06bf71476932e5d139fa326dcd0372766e16"
},
{
"url": "https://git.kernel.org/stable/c/0f0e4ae6975c773f7854fc48932a267f6c79088f"
}
],
"title": "net/mlx5: LAG, Fix off-by-one in single-FDB error rollback",
"x_generator": {
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72345",
"datePublished": "2026-08-15T05:55:50.427Z",
"dateReserved": "2026-08-09T03:40:39.920Z",
"dateUpdated": "2026-08-17T05:43:04.347Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-72345",
"date": "2026-10-03",
"epss": "0.00165",
"percentile": "0.05148"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/mellanox/mlx5/core/lag/shared_fdb.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "40cc06bf71476932e5d139fa326dcd0372766e16",
"status": "affected",
"version": "ddbb5ddc43ad000a984149db5af1133433938404",
"versionType": "git"
},
{
"lessThan": "0f0e4ae6975c773f7854fc48932a267f6c79088f",
"status": "affected",
"version": "ddbb5ddc43ad000a984149db5af1133433938404",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/mellanox/mlx5/core/lag/shared_fdb.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.14"
},
{
"lessThan": "6.14",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"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/mlx5: LAG, Fix off-by-one in single-FDB error rollback\n\nOn failure at index i, the reverse cleanup loop in\nmlx5_lag_create_single_fdb() starts from i, so the failed index\nitself is rolled back. That can operate on uninitialized state or\ndouble-tear-down a rule the add_one path already self-rolled-back.\n\nStart the rollback from i - 1 so only successfully-installed entries\nare undone."
}
],
"id": "CVE-2026-72345",
"lastModified": "2026-08-17T06:18:38.440",
"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": "2026-08-15T06:22:07.870",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0f0e4ae6975c773f7854fc48932a267f6c79088f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/40cc06bf71476932e5d139fa326dcd0372766e16"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-19T17:39:37+00:00",
"cve": "CVE-2026-72345",
"id": "CVE-2026-72345",
"initial_release_date": "2026-08-15T00:00:00+00:00",
"product_status:known_affected": "198",
"product_status:known_not_affected": "76",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net/mlx5: LAG, Fix off-by-one in single-FDB error rollback",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72345.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-10-03T00:28:27Z",
"cve": "CVE-2026-72345",
"id": "CVE-2026-72345",
"initial_release_date": "2026-09-01T13:29:46Z",
"product_status:known_affected": "2",
"product_status:known_not_affected": "362",
"product_status:recommended": "145",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-72345",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72345.json",
"version": "4"
}
}
}
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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