CVE-2026-43239 (GCVE-0-2026-43239)
Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-08-05 12:26
VLAI
EPSS
VEX
Title
smb: client: prevent races in ->query_interfaces()
Summary
In the Linux kernel, the following vulnerability has been resolved:
smb: client: prevent races in ->query_interfaces()
It was possible for two query interface works to be concurrently trying
to update the interfaces.
Prevent this by checking and updating iface_last_update under
iface_lock.
Severity
8.8 (High)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
aa45dadd34e44fcd6a9df4b395bee5b5633b4cec , < 93e8e3ee165ae4609a1222b516b573837103d2c3
(git)
Affected: aa45dadd34e44fcd6a9df4b395bee5b5633b4cec , < ab6564f416a6eaf1199200b6100952407b438f7d (git) Affected: aa45dadd34e44fcd6a9df4b395bee5b5633b4cec , < 6287eefaf21ec805d42f941bd368018cf397a7f5 (git) Affected: aa45dadd34e44fcd6a9df4b395bee5b5633b4cec , < 76cc4faba0343c6db945b8dc75425b33d633e1b8 (git) Affected: aa45dadd34e44fcd6a9df4b395bee5b5633b4cec , < c3c06e42e1527716c54f3ad2ced6a034b5f3a489 (git) |
guessed | |
| Linux | Linux |
Affected:
5.19
Unaffected: 0 , < 5.19 (semver) Unaffected: 6.6.128 , ≤ 6.6.* (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.16 , ≤ 6.18.* (semver) Unaffected: 6.19.6 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/smb/client/smb2ops.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "93e8e3ee165ae4609a1222b516b573837103d2c3",
"status": "affected",
"version": "aa45dadd34e44fcd6a9df4b395bee5b5633b4cec",
"versionType": "git"
},
{
"lessThan": "ab6564f416a6eaf1199200b6100952407b438f7d",
"status": "affected",
"version": "aa45dadd34e44fcd6a9df4b395bee5b5633b4cec",
"versionType": "git"
},
{
"lessThan": "6287eefaf21ec805d42f941bd368018cf397a7f5",
"status": "affected",
"version": "aa45dadd34e44fcd6a9df4b395bee5b5633b4cec",
"versionType": "git"
},
{
"lessThan": "76cc4faba0343c6db945b8dc75425b33d633e1b8",
"status": "affected",
"version": "aa45dadd34e44fcd6a9df4b395bee5b5633b4cec",
"versionType": "git"
},
{
"lessThan": "c3c06e42e1527716c54f3ad2ced6a034b5f3a489",
"status": "affected",
"version": "aa45dadd34e44fcd6a9df4b395bee5b5633b4cec",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/smb/client/smb2ops.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.19"
},
{
"lessThan": "5.19",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.128",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.75",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.16",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.128",
"versionStartIncluding": "5.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.75",
"versionStartIncluding": "5.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.16",
"versionStartIncluding": "5.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.6",
"versionStartIncluding": "5.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0",
"versionStartIncluding": "5.19",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: prevent races in -\u003equery_interfaces()\n\nIt was possible for two query interface works to be concurrently trying\nto update the interfaces.\n\nPrevent this by checking and updating iface_last_update under\niface_lock."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The vulnerable SMB client code processes FSCTL_QUERY_NETWORK_INTERFACE_INFO responses supplied by a remote SMB server over the network.\nAC:L - The required SMB3/multichannel capability and response timing can be controlled by a malicious server, and concurrent interface queries can be induced through normal mounted-session refresh/reconnect behavior.\nPR:N - The attacker needs no privileges on the victim system; a malicious or compromised SMB server can supply the responses once the client connects.\nUI:R - Exploitation requires the victim system or user to mount/connect to the SMB share, which is user interaction under the provided guidance.\nS:U - The impact is within the client kernel that contains the vulnerable SMB client component, without crossing a separate security authority such as a VM boundary.\nC:H - The race can corrupt the kernel-maintained cifs_server_iface linked list/refcount state, and kernel heap/list corruption is defensibly treated as potentially exposing arbitrary kernel memory.\nI:H - The same kernel list corruption can plausibly be leveraged beyond a simple fault into kernel memory corruption or code execution, so integrity impact is high under the required higher-severity rule.\nA:H - Even without full exploitation, the race can corrupt interface-list state and trigger kernel oops/panic or hang in the SMB client path."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:26:49.440Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/93e8e3ee165ae4609a1222b516b573837103d2c3"
},
{
"url": "https://git.kernel.org/stable/c/ab6564f416a6eaf1199200b6100952407b438f7d"
},
{
"url": "https://git.kernel.org/stable/c/6287eefaf21ec805d42f941bd368018cf397a7f5"
},
{
"url": "https://git.kernel.org/stable/c/76cc4faba0343c6db945b8dc75425b33d633e1b8"
},
{
"url": "https://git.kernel.org/stable/c/c3c06e42e1527716c54f3ad2ced6a034b5f3a489"
}
],
"title": "smb: client: prevent races in -\u003equery_interfaces()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-43239",
"datePublished": "2026-05-06T11:28:33.623Z",
"dateReserved": "2026-05-01T14:12:55.995Z",
"dateUpdated": "2026-08-05T12:26:49.440Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-43239",
"date": "2026-10-06",
"epss": "0.00354",
"percentile": "0.26931"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/smb/client/smb2ops.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "93e8e3ee165ae4609a1222b516b573837103d2c3",
"status": "affected",
"version": "aa45dadd34e44fcd6a9df4b395bee5b5633b4cec",
"versionType": "git"
},
{
"lessThan": "ab6564f416a6eaf1199200b6100952407b438f7d",
"status": "affected",
"version": "aa45dadd34e44fcd6a9df4b395bee5b5633b4cec",
"versionType": "git"
},
{
"lessThan": "6287eefaf21ec805d42f941bd368018cf397a7f5",
"status": "affected",
"version": "aa45dadd34e44fcd6a9df4b395bee5b5633b4cec",
"versionType": "git"
},
{
"lessThan": "76cc4faba0343c6db945b8dc75425b33d633e1b8",
"status": "affected",
"version": "aa45dadd34e44fcd6a9df4b395bee5b5633b4cec",
"versionType": "git"
},
{
"lessThan": "c3c06e42e1527716c54f3ad2ced6a034b5f3a489",
"status": "affected",
"version": "aa45dadd34e44fcd6a9df4b395bee5b5633b4cec",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/smb/client/smb2ops.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.19"
},
{
"lessThan": "5.19",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.128",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.75",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.16",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "56F16825-A54F-4D43-88F1-ED26D4FB0F71",
"versionEndExcluding": "6.6.128",
"versionStartIncluding": "5.19.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2",
"versionEndExcluding": "6.12.75",
"versionStartIncluding": "6.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B",
"versionEndExcluding": "6.18.16",
"versionStartIncluding": "6.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67",
"versionEndExcluding": "6.19.6",
"versionStartIncluding": "6.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.19:-:*:*:*:*:*:*",
"matchCriteriaId": "9D759CCF-9E1B-41B2-81AA-CB580C5F3EEC",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.19:rc4:*:*:*:*:*:*",
"matchCriteriaId": "2E9C0DB0-D349-489F-A3D6-B77214E93A8A",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.19:rc5:*:*:*:*:*:*",
"matchCriteriaId": "1A0DE3B7-0FFB-45AA-9BD6-19870CA7C6FD",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.19:rc6:*:*:*:*:*:*",
"matchCriteriaId": "00AE778B-BAEE-49EB-9F84-003B73D7862A",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.19:rc7:*:*:*:*:*:*",
"matchCriteriaId": "C178431E-AD82-4B3D-B70F-A273A02ABD5D",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.19:rc8:*:*:*:*:*:*",
"matchCriteriaId": "2CF5D19C-C418-4B57-B52D-7795547F4096",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: prevent races in -\u003equery_interfaces()\n\nIt was possible for two query interface works to be concurrently trying\nto update the interfaces.\n\nPrevent this by checking and updating iface_last_update under\niface_lock."
}
],
"id": "CVE-2026-43239",
"lastModified": "2026-06-17T10:49:13.053",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-05-06T12:16:44.217",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/6287eefaf21ec805d42f941bd368018cf397a7f5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/76cc4faba0343c6db945b8dc75425b33d633e1b8"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/93e8e3ee165ae4609a1222b516b573837103d2c3"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/ab6564f416a6eaf1199200b6100952407b438f7d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/c3c06e42e1527716c54f3ad2ced6a034b5f3a489"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-02T12:50:48+00:00",
"cve": "CVE-2026-43239",
"id": "CVE-2026-43239",
"initial_release_date": "2026-05-06T00:00:00+00:00",
"product_status:known_affected": "232",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: smb: client: prevent races in -\u003equery_interfaces()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43239.json",
"version": "3"
}
}
}
Loading…
Loading…
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.
Loading…
Loading…
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.
Loading…
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.
Loading…