CVE-2026-31682 (GCVE-0-2026-31682)
Vulnerability from cvelistv5 – Published: 2026-04-25 08:46 – Updated: 2026-10-19 18:56
VLAI
EPSS
VEX
Title
bridge: br_nd_send: linearize skb before parsing ND options
Summary
In the Linux kernel, the following vulnerability has been resolved:
bridge: br_nd_send: linearize skb before parsing ND options
br_nd_send() parses neighbour discovery options from ns->opt[] and
assumes that these options are in the linear part of request.
Its callers only guarantee that the ICMPv6 header and target address
are available, so the option area can still be non-linear. Parsing
ns->opt[] in that case can access data past the linear buffer.
Linearize request before option parsing and derive ns from the linear
network header.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:12 UTC
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
11 references
Impacted products
11 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ed842faeb2bd49256f00485402f3113205f91d30 , < c68433fd291c9e88c00292095172c62d1997d662
(git)
Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < 4f397b950c916e9a1f8a4fce04ea0110206cad47 (git) Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < bd91ec85aa4c77d645bd2739fc56784157a88ca2 (git) Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < 658261898130da620fc3d0fbb0523efb3366cb55 (git) Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < 2ba4caba423ed94d63006eb1d2227b0332ab7fcd (git) Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < 9c55e41c73af5c4511070933b1bd25248521270c (git) Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < 3a30f6469b058574f49efde61cd6f5d79e576053 (git) Affected: ed842faeb2bd49256f00485402f3113205f91d30 , < a01aee7cafc575bb82f5529e8734e7052f9b16ea (git) |
guessed | |
| Linux | Linux |
Affected:
4.15
Unaffected: 0 , < 4.15 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.134 , ≤ 6.6.* (semver) Unaffected: 6.12.81 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.7 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.7 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.7 , < *
(custom)
|
guessed |
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"lessThan": "9c55e41c73af5c4511070933b1bd25248521270c",
"status": "affected",
"version": "ed842faeb2bd49256f00485402f3113205f91d30",
"versionType": "git"
},
{
"lessThan": "3a30f6469b058574f49efde61cd6f5d79e576053",
"status": "affected",
"version": "ed842faeb2bd49256f00485402f3113205f91d30",
"versionType": "git"
},
{
"lessThan": "a01aee7cafc575bb82f5529e8734e7052f9b16ea",
"status": "affected",
"version": "ed842faeb2bd49256f00485402f3113205f91d30",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/bridge/br_arp_nd_proxy.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.15"
},
{
"lessThan": "4.15",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.168",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.134",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.81",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.22",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.12",
"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": "5.10.253",
"versionStartIncluding": "4.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.203",
"versionStartIncluding": "4.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.168",
"versionStartIncluding": "4.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.134",
"versionStartIncluding": "4.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.81",
"versionStartIncluding": "4.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.22",
"versionStartIncluding": "4.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.12",
"versionStartIncluding": "4.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0",
"versionStartIncluding": "4.15",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbridge: br_nd_send: linearize skb before parsing ND options\n\nbr_nd_send() parses neighbour discovery options from ns-\u003eopt[] and\nassumes that these options are in the linear part of request.\n\nIts callers only guarantee that the ICMPv6 header and target address\nare available, so the option area can still be non-linear. Parsing\nns-\u003eopt[] in that case can access data past the linear buffer.\n\nLinearize request before option parsing and derive ns from the linear\nnetwork header."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.1,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The vulnerable code is reached by received IPv6/ICMPv6 Neighbor Solicitation traffic on a Linux bridge port before any protocol authentication. In bridged physical or virtual deployments, a network peer can send the crafted packet to the affected bridge path.\nAC:L - There is no race, and the attacker controls the packet contents and can repeat attempts to hit a non-linear skb receive path. Neighbor suppression and a valid neighbor/FDB state are deployment prerequisites, but not per-attempt conditions outside a reasonable affected configuration.\nPR:N - The packet receive path has no credential or authentication check before `br_nd_send()` is reached. CAP_NET_ADMIN is needed to configure bridge neighbor suppression, but exploiting an already configured bridge requires no privileges.\nUI:N - No victim user action is required once the bridge is in the affected configuration. The attacker only needs to send crafted network traffic.\nS:U - The vulnerable component and impacted resources are the same kernel networking/bridge security authority. This is not a hypervisor, IOMMU, or separate security-scope escape by itself.\nC:H - The bug is an out-of-bounds read past the skb linear area while parsing attacker-controlled ND options. The read data can influence bytes copied into the generated Neighbor Advertisement, and under the required rule an OOB read that is not strictly bounded to a few bytes is High.\nI:N - The vulnerable operation reads memory past the linear skb buffer but does not write to kernel memory or provide a direct data-modification primitive. The generated reply may be misaddressed, but the bug does not give meaningful integrity modification.\nA:H - Reading past the linear buffer can trigger a kernel fault/oops or panic depending on skb layout and memory mapping. The attack can be repeated remotely against the bridge receive path, making availability impact High."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:24:27.851Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/c68433fd291c9e88c00292095172c62d1997d662"
},
{
"url": "https://git.kernel.org/stable/c/4f397b950c916e9a1f8a4fce04ea0110206cad47"
},
{
"url": "https://git.kernel.org/stable/c/bd91ec85aa4c77d645bd2739fc56784157a88ca2"
},
{
"url": "https://git.kernel.org/stable/c/658261898130da620fc3d0fbb0523efb3366cb55"
},
{
"url": "https://git.kernel.org/stable/c/2ba4caba423ed94d63006eb1d2227b0332ab7fcd"
},
{
"url": "https://git.kernel.org/stable/c/9c55e41c73af5c4511070933b1bd25248521270c"
},
{
"url": "https://git.kernel.org/stable/c/3a30f6469b058574f49efde61cd6f5d79e576053"
},
{
"url": "https://git.kernel.org/stable/c/a01aee7cafc575bb82f5529e8734e7052f9b16ea"
}
],
"title": "bridge: br_nd_send: linearize skb before parsing ND options",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-31682",
"datePublished": "2026-04-25T08:46:59.106Z",
"dateReserved": "2026-03-09T15:48:24.130Z",
"dateUpdated": "2026-10-19T18:56:04.675Z",
"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
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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.