CVE-2026-80707 (GCVE-0-2026-80707)
Vulnerability from cvelistv5
Published
2026-08-28 06:53
Modified
2026-08-29 06:22
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
can: j1939: transport: j1939_session_fresh_new(): initialize receive buffer
Zero the allocated buffer in j1939_session_fresh_new() to ensure it
contains no residual data.
While there is a potential performance impact if users allocate maximum
sized ETP buffers, most real-world use cases are not noticeably affected
since the maximum known buffer size is typically around 65K.
[mkl: add Message-ID]
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 9d71dd0c70099914fcd063135da3c580865e924c Version: 9d71dd0c70099914fcd063135da3c580865e924c Version: 9d71dd0c70099914fcd063135da3c580865e924c Version: 9d71dd0c70099914fcd063135da3c580865e924c Version: 9d71dd0c70099914fcd063135da3c580865e924c Version: 9d71dd0c70099914fcd063135da3c580865e924c Version: 9d71dd0c70099914fcd063135da3c580865e924c Version: 9d71dd0c70099914fcd063135da3c580865e924c |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/can/j1939/transport.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "348818277a3646d5b9fa60c9d20c00dc4bc86832",
"status": "affected",
"version": "9d71dd0c70099914fcd063135da3c580865e924c",
"versionType": "git"
},
{
"lessThan": "f3e120a34b336079479fa10f706f0636eaa6e751",
"status": "affected",
"version": "9d71dd0c70099914fcd063135da3c580865e924c",
"versionType": "git"
},
{
"lessThan": "bbfa49d1e287de44994955b44d19281be3195b44",
"status": "affected",
"version": "9d71dd0c70099914fcd063135da3c580865e924c",
"versionType": "git"
},
{
"lessThan": "194d67e92197eb820f4c2c6605d9721333b3eba0",
"status": "affected",
"version": "9d71dd0c70099914fcd063135da3c580865e924c",
"versionType": "git"
},
{
"lessThan": "038bad8e16c2e28acf31f0b527a816fb23a57269",
"status": "affected",
"version": "9d71dd0c70099914fcd063135da3c580865e924c",
"versionType": "git"
},
{
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"status": "affected",
"version": "9d71dd0c70099914fcd063135da3c580865e924c",
"versionType": "git"
},
{
"lessThan": "d5b3613c7d69d8dcb4dd6704f1f463198ce9f6cf",
"status": "affected",
"version": "9d71dd0c70099914fcd063135da3c580865e924c",
"versionType": "git"
},
{
"lessThan": "eb96c58907922546e415e545fe9a14ea63b02719",
"status": "affected",
"version": "9d71dd0c70099914fcd063135da3c580865e924c",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/can/j1939/transport.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.4"
},
{
"lessThan": "5.4",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.8",
"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": "5.10.265",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.216",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.183",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.151",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.103",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.44",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.8",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "5.4",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: transport: j1939_session_fresh_new(): initialize receive buffer\n\nZero the allocated buffer in j1939_session_fresh_new() to ensure it\ncontains no residual data.\n\nWhile there is a potential performance impact if users allocate maximum\nsized ETP buffers, most real-world use cases are not noticeably affected\nsince the maximum known buffer size is typically around 65K.\n\n[mkl: add Message-ID]"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - Received J1939 TP/ETP RTS frames enter j1939_can_recv()\u2192j1939_tp_recv()\u2192j1939_xtp_rx_rts_session_new()\u2192j1939_session_fresh_new() from the CAN receive path with no local syscall; telematics/CAN gateways routinely expose J1939 to remote peers, consistent with prior kernel CNA scores for the same subsystem (e.g. CVE-2023-52887, CVE-2026-22997).\nAC:L - The attacker controls RTS-declared message size, DATA/EOMA sequencing, and timing; skb_put() leaves the entire allocation uninitialized, j1939_xtp_rx_eoma_one() completes without verifying all data packets arrived, and recvmsg returns the full skb length\u2014reliably mixing attacker data with residual heap bytes (including trailing padding).\nPR:N - J1939 receive processing has no authentication gate; an unauthenticated CAN/J1939 peer can send crafted transport-control frames to a victim ECU that already runs a bound J1939 socket (normal automotive, trucking, and industrial deployments) without any Linux account or capability on the target.\nUI:N - No victim interaction is required beyond the target already operating the J1939 stack with a bound socket; the attacker only transmits crafted frames on the bus to trigger session allocation and completion.\nS:U - Uninitialized kernel heap contents are disclosed to matching local J1939 socket owners via recvmsg; impact remains within the same kernel security authority and does not cross VM, IOMMU, or sandbox boundaries.\nC:H - j1939_session_fresh_new() allocates the receive buffer with skb_put() instead of skb_put_zero(), so unfilled bytes retain prior slab contents; on completion j1939_session_completed() delivers the full total_message_size buffer (up to tp_max_packet_size, commonly ~65K) to userspace, disclosing kernel pointers and heap data.\nI:N - The bug only omits zero-initialization of the receive skb; there is no out-of-bounds write, use-after-free, or other memory-corruption primitive enabling integrity impact.\nA:N - Sessions complete or abort normally without kernel panic, oops, hang, or resource exhaustion; the vulnerability is an information-disclosure defect with no availability impact."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-29T06:22:24.493Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/348818277a3646d5b9fa60c9d20c00dc4bc86832"
},
{
"url": "https://git.kernel.org/stable/c/f3e120a34b336079479fa10f706f0636eaa6e751"
},
{
"url": "https://git.kernel.org/stable/c/bbfa49d1e287de44994955b44d19281be3195b44"
},
{
"url": "https://git.kernel.org/stable/c/194d67e92197eb820f4c2c6605d9721333b3eba0"
},
{
"url": "https://git.kernel.org/stable/c/038bad8e16c2e28acf31f0b527a816fb23a57269"
},
{
"url": "https://git.kernel.org/stable/c/8604a3b81b9d0ceaf04fee5f52e701f623a179f9"
},
{
"url": "https://git.kernel.org/stable/c/d5b3613c7d69d8dcb4dd6704f1f463198ce9f6cf"
},
{
"url": "https://git.kernel.org/stable/c/eb96c58907922546e415e545fe9a14ea63b02719"
}
],
"title": "can: j1939: transport: j1939_session_fresh_new(): initialize receive buffer",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80707",
"datePublished": "2026-08-28T06:53:08.244Z",
"dateReserved": "2026-08-26T14:34:25.787Z",
"dateUpdated": "2026-08-29T06:22:24.493Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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