CVE-2026-31673 (GCVE-0-2026-31673)
Vulnerability from cvelistv5 – Published: 2026-04-25 08:46 – Updated: 2026-10-19 18:56
VLAI
EPSS
VEX
Title
af_unix: read UNIX_DIAG_VFS data under unix_state_lock
Summary
In the Linux kernel, the following vulnerability has been resolved:
af_unix: read UNIX_DIAG_VFS data under unix_state_lock
Exact UNIX diag lookups hold a reference to the socket, but not to
u->path. Meanwhile, unix_release_sock() clears u->path under
unix_state_lock() and drops the path reference after unlocking.
Read the inode and device numbers for UNIX_DIAG_VFS while holding
unix_state_lock(), then emit the netlink attribute after dropping the
lock.
This keeps the VFS data stable while the reply is being built.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:12 UTC
CWE
- CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
References
9 references
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
5f7b0569460b7d8d01ca776430a00505a68b7584 , < e7339db13b9ddb63417b12da55fd6191e59f7442
(git)
Affected: 5f7b0569460b7d8d01ca776430a00505a68b7584 , < 4f6a8f10182c3a9d22e8eb183957ae7ade9e4bf7 (git) Affected: 5f7b0569460b7d8d01ca776430a00505a68b7584 , < c3ec44ab4526bbc4b6c9fc845af86488244f4c9b (git) Affected: 5f7b0569460b7d8d01ca776430a00505a68b7584 , < b9232421a77a649c9376c99fdfc8cb7f79cad34c (git) Affected: 5f7b0569460b7d8d01ca776430a00505a68b7584 , < 0c739f3785f84af695952c2bac8be2f45082c9b8 (git) Affected: 5f7b0569460b7d8d01ca776430a00505a68b7584 , < 900a4e0910e98b8caef117d5df00471fa438dcf9 (git) Affected: 5f7b0569460b7d8d01ca776430a00505a68b7584 , < bdf206e740bf2919d818f132c8c9cc7ed91d11c0 (git) Affected: 5f7b0569460b7d8d01ca776430a00505a68b7584 , < 39897df386376912d561d4946499379effa1e7ef (git) |
guessed | |
| Linux | Linux |
Affected:
3.3
Unaffected: 0 , < 3.3 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.136 , ≤ 6.6.* (semver) Unaffected: 6.12.83 , ≤ 6.12.* (semver) Unaffected: 6.18.24 , ≤ 6.18.* (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
guessed |
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\naf_unix: leer datos de UNIX_DIAG_VFS bajo unix_state_lock\n\nLas b\u00fasquedas de diagn\u00f3stico UNIX exactas mantienen una referencia al socket, pero no a u -\u003e path. Mientras tanto, unix_release_sock() borra u -\u003e path bajo unix_state_lock() y libera la referencia de la ruta despu\u00e9s de desbloquear.\n\nLeer los n\u00fameros de inodo y de dispositivo para UNIX_DIAG_VFS mientras se mantiene unix_state_lock(), luego emitir el atributo netlink despu\u00e9s de liberar el bloqueo.\n\nEsto mantiene los datos VFS estables mientras se construye la respuesta."
}
],
"id": "CVE-2026-31673",
"lastModified": "2026-11-11T23:10:00.263",
"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,
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}
],
"ssvcV203": [
{
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},
{
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},
{
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}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T15:12:05.532062Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-04-25T09:16:00.423",
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},
{
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"url": "https://git.kernel.org/stable/c/e7339db13b9ddb63417b12da55fd6191e59f7442"
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-362"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-07T04:37:12+00:00",
"cve": "CVE-2026-31673",
"id": "CVE-2026-31673",
"initial_release_date": "2026-04-25T00:00:00+00:00",
"product_status:known_affected": "186",
"product_status:known_not_affected": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: af_unix: read UNIX_DIAG_VFS data under unix_state_lock",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31673.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"affected": [
{
"defaultStatus": "unknown",
"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
"vendor": "Siemens",
"versions": [
{
"lessThan": "*",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-15T01:17:42.865Z",
"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"shortName": "siemens-SADP"
},
"references": [
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
}
],
"x_adpType": "supplier"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-31673",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T15:12:05.532062Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-362",
"description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-16T15:12:06.239Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/unix/diag.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "e7339db13b9ddb63417b12da55fd6191e59f7442",
"status": "affected",
"version": "5f7b0569460b7d8d01ca776430a00505a68b7584",
"versionType": "git"
},
{
"lessThan": "4f6a8f10182c3a9d22e8eb183957ae7ade9e4bf7",
"status": "affected",
"version": "5f7b0569460b7d8d01ca776430a00505a68b7584",
"versionType": "git"
},
{
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"version": "5f7b0569460b7d8d01ca776430a00505a68b7584",
"versionType": "git"
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{
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"status": "affected",
"version": "5f7b0569460b7d8d01ca776430a00505a68b7584",
"versionType": "git"
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{
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{
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"version": "5f7b0569460b7d8d01ca776430a00505a68b7584",
"versionType": "git"
},
{
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"status": "affected",
"version": "5f7b0569460b7d8d01ca776430a00505a68b7584",
"versionType": "git"
},
{
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"status": "affected",
"version": "5f7b0569460b7d8d01ca776430a00505a68b7584",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.3"
},
{
"lessThan": "3.3",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.136",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.83",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.24",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.14",
"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": "5.10.258",
"versionStartIncluding": "3.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.209",
"versionStartIncluding": "3.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.175",
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"vulnerable": true
},
{
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"versionEndExcluding": "6.6.136",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.83",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.24",
"versionStartIncluding": "3.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.14",
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"vulnerable": true
},
{
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"versionEndExcluding": "7.0",
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"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: read UNIX_DIAG_VFS data under unix_state_lock\n\nExact UNIX diag lookups hold a reference to the socket, but not to\nu-\u003epath. Meanwhile, unix_release_sock() clears u-\u003epath under\nunix_state_lock() and drops the path reference after unlocking.\n\nRead the inode and device numbers for UNIX_DIAG_VFS while holding\nunix_state_lock(), then emit the netlink attribute after dropping the\nlock.\n\nThis keeps the VFS data stable while the reply is being built."
}
],
"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 vulnerable code is reached through local NETLINK_SOCK_DIAG SOCK_DIAG_BY_FAMILY requests for AF_UNIX diagnostics. It is not reachable from remote network packets; an attacker needs local code execution to create sockets and send netlink requests.\nAC:L - The race is attacker-controlled because one thread can repeatedly issue exact UNIX_DIAG requests with UDIAG_SHOW_VFS while another closes attacker-created pathname AF_UNIX sockets. No rare external condition is required beyond timing that can be retried.\nPR:L - Unprivileged users can create AF_UNIX sockets and NETLINK_SOCK_DIAG sockets, and the sock_diag netlink socket permits non-root diagnostic requests. No real root or init-namespace CAP_NET_ADMIN is required.\nUI:N - Exploitation does not require any victim action. The attacker can create, bind, query, unlink, and close the involved sockets directly.\nS:U - The bug is in the kernel AF_UNIX diagnostic path and impacts kernel resources within the same security authority. It is a standard local kernel vulnerability, not a VM, IOMMU, or sandbox boundary-crossing issue.\nC:H - The bug is a use-after-free/read-after-free of the AF_UNIX VFS path dentry, allowing stale kernel object pointers to be dereferenced and returned or used during netlink reply construction. Under the required kernel scoring guidance, UAFs are treated as high confidentiality impact.\nI:H - Although the immediate vulnerable operation reads VFS fields, it is a kernel use-after-free in attacker-controllable local object lifetime and race conditions. Following the required guidance and higher-severity rule, UAFs are scored as potentially enabling integrity compromise.\nA:H - The stale dentry or related VFS pointer can be dereferenced after path_put(), plausibly causing a kernel oops or panic. Repeated local triggering makes high availability impact defensible."
}
]
}
],
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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},
{
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},
{
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},
{
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},
{
"url": "https://git.kernel.org/stable/c/0c739f3785f84af695952c2bac8be2f45082c9b8"
},
{
"url": "https://git.kernel.org/stable/c/900a4e0910e98b8caef117d5df00471fa438dcf9"
},
{
"url": "https://git.kernel.org/stable/c/bdf206e740bf2919d818f132c8c9cc7ed91d11c0"
},
{
"url": "https://git.kernel.org/stable/c/39897df386376912d561d4946499379effa1e7ef"
}
],
"title": "af_unix: read UNIX_DIAG_VFS data under unix_state_lock",
"x_generator": {
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}
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"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-31673",
"datePublished": "2026-04-25T08:46:49.246Z",
"dateReserved": "2026-03-09T15:48:24.130Z",
"dateUpdated": "2026-10-19T18:56:03.514Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.