CVE-2026-46039 (GCVE-0-2026-46039)
Vulnerability from cvelistv5 – Published: 2026-05-27 12:56 – Updated: 2026-08-05 12:29
VLAI
EPSS
VEX
Title
rxgk: Fix potential integer overflow in length check
Summary
In the Linux kernel, the following vulnerability has been resolved:
rxgk: Fix potential integer overflow in length check
Fix potential integer overflow in rxgk_extract_token() when checking the
length of the ticket. Rather than rounding up the value to be tested
(which might overflow), round down the size of the available data.
Severity
9.8 (Critical)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
2429a197648178cd4dc930a9d87c13c547460564 , < 43222ac484f93b3ec2d240a7575e1cedd31f5fa4
(git)
Affected: 2429a197648178cd4dc930a9d87c13c547460564 , < 183d37f12d1c8ed24a5bfc7addad05510da22a94 (git) Affected: 2429a197648178cd4dc930a9d87c13c547460564 , < 6929350080f4da292d111a3b33e53138fee51cec (git) Affected: 71571e187106631a8127f2dde780f35caa358d33 (git) Affected: 6.16.9 , < 6.17 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.17
Unaffected: 0 , < 6.17 (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/rxrpc/rxgk_app.c",
"net/rxrpc/rxgk_common.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "43222ac484f93b3ec2d240a7575e1cedd31f5fa4",
"status": "affected",
"version": "2429a197648178cd4dc930a9d87c13c547460564",
"versionType": "git"
},
{
"lessThan": "183d37f12d1c8ed24a5bfc7addad05510da22a94",
"status": "affected",
"version": "2429a197648178cd4dc930a9d87c13c547460564",
"versionType": "git"
},
{
"lessThan": "6929350080f4da292d111a3b33e53138fee51cec",
"status": "affected",
"version": "2429a197648178cd4dc930a9d87c13c547460564",
"versionType": "git"
},
{
"status": "affected",
"version": "71571e187106631a8127f2dde780f35caa358d33",
"versionType": "git"
},
{
"lessThan": "6.17",
"status": "affected",
"version": "6.16.9",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/rxrpc/rxgk_app.c",
"net/rxrpc/rxgk_common.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.17"
},
{
"lessThan": "6.17",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.27",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.27",
"versionStartIncluding": "6.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0.4",
"versionStartIncluding": "6.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1",
"versionStartIncluding": "6.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.16.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxgk: Fix potential integer overflow in length check\n\nFix potential integer overflow in rxgk_extract_token() when checking the\nlength of the ticket. Rather than rounding up the value to be tested\n(which might overflow), round down the size of the available data."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The bug is triggered by a crafted RxRPC RESPONSE packet received over UDP and parsed by the in-kernel rxgk server-side handshake (`rxgk_verify_response`); no local access is needed.\nAC:L - The integer overflow is deterministic for fixed `ticket_len` values (0xFFFFFFFD\u20130xFFFFFFFF), and all packet fields including the enumerable kvno/enctype used for the server-key lookup are attacker-controlled, so the attacker reliably triggers the OOB.\nPR:N - The RESPONSE packet is processed during the security handshake before the client is authenticated; the attacker needs no credentials, only a kvno/enctype matching a server key (a public, guessable identifier).\nUI:N - The rxrpc service processes incoming RESPONSE packets automatically with no victim interaction.\nS:U - The corruption is confined to the kernel\u0027s own memory within the same security authority; no VM/IOMMU boundary is crossed.\nC:H - The truncated negative length yields a ~4 GB scatterlist entry, causing an enormous out-of-bounds read of adjacent kernel memory during AEAD decryption, well beyond a few bounded bytes.\nI:H - The AEAD decrypt is in-place (src==dst scatterlist), so plaintext is written back across the oversized region, corrupting adjacent kernel heap memory (out-of-bounds write) before the fault.\nA:H - Reading/writing a ~4 GB region from a small skb buffer reliably hits unmapped memory, producing a kernel oops/panic (remote, unauthenticated DoS)."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:29:17.995Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/43222ac484f93b3ec2d240a7575e1cedd31f5fa4"
},
{
"url": "https://git.kernel.org/stable/c/183d37f12d1c8ed24a5bfc7addad05510da22a94"
},
{
"url": "https://git.kernel.org/stable/c/6929350080f4da292d111a3b33e53138fee51cec"
}
],
"title": "rxgk: Fix potential integer overflow in length check",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-46039",
"datePublished": "2026-05-27T12:56:51.317Z",
"dateReserved": "2026-05-13T15:03:33.093Z",
"dateUpdated": "2026-08-05T12:29:17.995Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-46039",
"date": "2026-10-13",
"epss": "0.00649",
"percentile": "0.49767"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/rxrpc/rxgk_app.c",
"net/rxrpc/rxgk_common.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "43222ac484f93b3ec2d240a7575e1cedd31f5fa4",
"status": "affected",
"version": "2429a197648178cd4dc930a9d87c13c547460564",
"versionType": "git"
},
{
"lessThan": "183d37f12d1c8ed24a5bfc7addad05510da22a94",
"status": "affected",
"version": "2429a197648178cd4dc930a9d87c13c547460564",
"versionType": "git"
},
{
"lessThan": "6929350080f4da292d111a3b33e53138fee51cec",
"status": "affected",
"version": "2429a197648178cd4dc930a9d87c13c547460564",
"versionType": "git"
},
{
"status": "affected",
"version": "71571e187106631a8127f2dde780f35caa358d33",
"versionType": "git"
},
{
"lessThan": "6.17",
"status": "affected",
"version": "6.16.9",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/rxrpc/rxgk_app.c",
"net/rxrpc/rxgk_common.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.17"
},
{
"lessThan": "6.17",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.27",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "98F094CD-A7F6-4BEA-8870-C45B63E05825",
"versionEndExcluding": "6.17",
"versionStartIncluding": "6.16.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "A8B5B12B-D912-4498-ADCB-79CD90DD9F0F",
"versionEndExcluding": "6.18.27",
"versionStartIncluding": "6.17.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "CDB78D6D-22C3-4154-B0D0-94AF1CE5C2E3",
"versionEndExcluding": "7.0.4",
"versionStartIncluding": "6.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:*",
"matchCriteriaId": "7CC8B11D-82DC-4958-8DC7-BF5CC829A5E9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc7:*:*:*:*:*:*",
"matchCriteriaId": "3963C3A0-CEA1-4F5C-8011-3A593ABB684D",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxgk: Fix potential integer overflow in length check\n\nFix potential integer overflow in rxgk_extract_token() when checking the\nlength of the ticket. Rather than rounding up the value to be tested\n(which might overflow), round down the size of the available data."
}
],
"id": "CVE-2026-46039",
"lastModified": "2026-06-17T10:52:56.803",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-05-27T14:17:23.263",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/183d37f12d1c8ed24a5bfc7addad05510da22a94"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/43222ac484f93b3ec2d240a7575e1cedd31f5fa4"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/6929350080f4da292d111a3b33e53138fee51cec"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-190"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-05T14:51:18+00:00",
"cve": "CVE-2026-46039",
"id": "CVE-2026-46039",
"initial_release_date": "2026-05-27T00:00:00+00:00",
"product_status:known_affected": "76",
"product_status:known_not_affected": "198",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: rxgk: Fix potential integer overflow in length check",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46039.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…