CVE-2023-53705 (GCVE-0-2023-53705)
Vulnerability from cvelistv5 – Published: 2025-10-22 13:23 – Updated: 2026-08-05 09:15
VLAI
EPSS
VEX
Title
ipv6: Fix out-of-bounds access in ipv6_find_tlv()
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipv6: Fix out-of-bounds access in ipv6_find_tlv()
optlen is fetched without checking whether there is more than one byte to parse.
It can lead to out-of-bounds access.
Found by InfoTeCS on behalf of Linux Verification Center
(linuxtesting.org) with SVACE.
Severity
8.2 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
c61a404325093250b676f40ad8f4dd00f3bcab5f , < 59e656d0d4a84ea0ee9a39c6f69160a3effccc94
(git)
Affected: c61a404325093250b676f40ad8f4dd00f3bcab5f , < 04bf69e3de435d793a203aacc4b774f8f9f2baeb (git) Affected: c61a404325093250b676f40ad8f4dd00f3bcab5f , < 011f47c8b8389154f996f5f69da8efc3a3beefef (git) Affected: c61a404325093250b676f40ad8f4dd00f3bcab5f , < e5f82688ae10f5f386952e65e941bb8868ee54dc (git) Affected: c61a404325093250b676f40ad8f4dd00f3bcab5f , < 9b92e2d0eb696d7586ba832c8854653b59887da0 (git) Affected: c61a404325093250b676f40ad8f4dd00f3bcab5f , < 91dd8aab9c9f193210681b86b6b92840ffe74f0c (git) Affected: c61a404325093250b676f40ad8f4dd00f3bcab5f , < ae68c0f7edbc9a294094ce03a0aaf45aa489ce40 (git) Affected: c61a404325093250b676f40ad8f4dd00f3bcab5f , < 878ecb0897f4737a4c9401f3523fd49589025671 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.19
Unaffected: 0 , < 2.6.19 (semver) Unaffected: 4.14.316 , ≤ 4.14.* (semver) Unaffected: 4.19.284 , ≤ 4.19.* (semver) Unaffected: 5.4.244 , ≤ 5.4.* (semver) Unaffected: 5.10.181 , ≤ 5.10.* (semver) Unaffected: 5.15.114 , ≤ 5.15.* (semver) Unaffected: 6.1.31 , ≤ 6.1.* (semver) Unaffected: 6.3.5 , ≤ 6.3.* (semver) Unaffected: 6.4 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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"net/ipv6/exthdrs_core.c"
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"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "4.14.316",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.284",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.244",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.181",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.15.114",
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},
{
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"status": "unaffected",
"version": "6.1.31",
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},
{
"lessThanOrEqual": "6.3.*",
"status": "unaffected",
"version": "6.3.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.4",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
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"versionEndExcluding": "4.14.316",
"versionStartIncluding": "2.6.19",
"vulnerable": true
},
{
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"versionEndExcluding": "4.19.284",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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},
{
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true
},
{
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"versionEndExcluding": "6.3.5",
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"vulnerable": true
},
{
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"versionEndExcluding": "6.4",
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}
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"negate": false,
"operator": "OR"
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}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: Fix out-of-bounds access in ipv6_find_tlv()\n\noptlen is fetched without checking whether there is more than one byte to parse.\nIt can lead to out-of-bounds access.\n\nFound by InfoTeCS on behalf of Linux Verification Center\n(linuxtesting.org) with SVACE."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.2,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - `ipv6_find_tlv()` parses IPv6 extension-header TLV options directly from sk_buff packet data (CALIPSO/MIP6/fragmentation paths), so the malformed option is delivered via a crafted network packet.\nAC:L - The attacker fully controls the extension-header option bytes and can deterministically craft an option layout that leaves a single trailing byte, triggering the out-of-bounds read reliably.\nPR:N - The vulnerable code processes untrusted IPv6 packets in network paths (labeling, MIP6, tunnel/segmentation) that require no authentication; a locally-triggered variant needs only CAP_NET_RAW obtainable via user namespaces, so the higher-severity choice is no privileges.\nUI:N - Parsing of a received/crafted packet\u0027s extension headers happens automatically in the kernel with no victim interaction required.\nS:U - The out-of-bounds access stays within the kernel\u0027s own memory and does not cross a security/privilege boundary such as a VM or IOMMU domain.\nC:L - A single out-of-bounds byte of adjacent kernel memory is read; it is strictly bounded to one byte and is only used internally in a comparison that always fails, so it is not disclosed back to the attacker.\nI:N - The defect is a read only (`optlen = nh[offset+1]`); no out-of-bounds write or data modification occurs.\nA:H - The out-of-bounds read can fault when the packet buffer abuts an unmapped page (or trip KASAN/panic_on_warn), producing a kernel oops and denial of service."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T09:15:37.219Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
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"url": "https://git.kernel.org/stable/c/59e656d0d4a84ea0ee9a39c6f69160a3effccc94"
},
{
"url": "https://git.kernel.org/stable/c/04bf69e3de435d793a203aacc4b774f8f9f2baeb"
},
{
"url": "https://git.kernel.org/stable/c/011f47c8b8389154f996f5f69da8efc3a3beefef"
},
{
"url": "https://git.kernel.org/stable/c/e5f82688ae10f5f386952e65e941bb8868ee54dc"
},
{
"url": "https://git.kernel.org/stable/c/9b92e2d0eb696d7586ba832c8854653b59887da0"
},
{
"url": "https://git.kernel.org/stable/c/91dd8aab9c9f193210681b86b6b92840ffe74f0c"
},
{
"url": "https://git.kernel.org/stable/c/ae68c0f7edbc9a294094ce03a0aaf45aa489ce40"
},
{
"url": "https://git.kernel.org/stable/c/878ecb0897f4737a4c9401f3523fd49589025671"
}
],
"title": "ipv6: Fix out-of-bounds access in ipv6_find_tlv()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
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"assignerShortName": "Linux",
"cveId": "CVE-2023-53705",
"datePublished": "2025-10-22T13:23:42.641Z",
"dateReserved": "2025-10-22T13:21:37.346Z",
"dateUpdated": "2026-08-05T09:15:37.219Z",
"state": "PUBLISHED"
},
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"cve": "CVE-2023-53705",
"date": "2026-09-18",
"epss": "0.00526",
"percentile": "0.43523"
},
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{
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"versions": [
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": "4.14.316",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.284",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
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"version": "5.4.244",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.181",
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{
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},
{
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"status": "unaffected",
"version": "6.1.31",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.3.5",
"versionType": "semver"
},
{
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}
]
}
],
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}
],
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"descriptions": [
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: Fix out-of-bounds access in ipv6_find_tlv()\n\noptlen is fetched without checking whether there is more than one byte to parse.\nIt can lead to out-of-bounds access.\n\nFound by InfoTeCS on behalf of Linux Verification Center\n(linuxtesting.org) with SVACE."
}
],
"id": "CVE-2023-53705",
"lastModified": "2026-08-04T10:19:18.537",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 4.2,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2025-10-22T14:15:45.080",
"references": [
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"url": "https://git.kernel.org/stable/c/011f47c8b8389154f996f5f69da8efc3a3beefef"
},
{
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"url": "https://git.kernel.org/stable/c/04bf69e3de435d793a203aacc4b774f8f9f2baeb"
},
{
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"url": "https://git.kernel.org/stable/c/59e656d0d4a84ea0ee9a39c6f69160a3effccc94"
},
{
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"url": "https://git.kernel.org/stable/c/878ecb0897f4737a4c9401f3523fd49589025671"
},
{
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"url": "https://git.kernel.org/stable/c/91dd8aab9c9f193210681b86b6b92840ffe74f0c"
},
{
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"url": "https://git.kernel.org/stable/c/9b92e2d0eb696d7586ba832c8854653b59887da0"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e5f82688ae10f5f386952e65e941bb8868ee54dc"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T19:15:56+00:00",
"cve": "CVE-2023-53705",
"id": "CVE-2023-53705",
"initial_release_date": "2023-01-01T00:00:00+00:00",
"product_status:fixed": "883",
"product_status:known_affected": "124",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ipv6: Fix out-of-bounds access in ipv6_find_tlv()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53705.json",
"version": "3"
}
}
}
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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.
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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.
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