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CVE-2023-53705 (GCVE-0-2023-53705)

Vulnerability from cvelistv5 – Published: 2025-10-22 13:23 – Updated: 2026-08-05 09:15
VLAI
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)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Assigner
References
Impacted 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 Create a notification for this product.
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)
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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."
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
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              "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."
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:15:37.219Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/878ecb0897f4737a4c9401f3523fd49589025671"
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      "title": "ipv6: Fix out-of-bounds access in ipv6_find_tlv()",
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    "cveId": "CVE-2023-53705",
    "datePublished": "2025-10-22T13:23:42.641Z",
    "dateReserved": "2025-10-22T13:21:37.346Z",
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    "state": "PUBLISHED"
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SVACE.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/exthdrs_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"c61a404325093250b676f40ad8f4dd00f3bcab5f\",\"lessThan\":\"59e656d0d4a84ea0ee9a39c6f69160a3effccc94\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c61a404325093250b676f40ad8f4dd00f3bcab5f\",\"lessThan\":\"04bf69e3de435d793a203aacc4b774f8f9f2baeb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c61a404325093250b676f40ad8f4dd00f3bcab5f\",\"lessThan\":\"011f47c8b8389154f996f5f69da8efc3a3beefef\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c61a404325093250b676f40ad8f4dd00f3bcab5f\",\"lessThan\":\"e5f82688ae10f5f386952e65e941bb8868ee54dc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c61a404325093250b676f40ad8f4dd00f3bcab5f\",\"lessThan\":\"9b92e2d0eb696d7586ba832c8854653b59887da0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c61a404325093250b676f40ad8f4dd00f3bcab5f\",\"lessThan\":\"91dd8aab9c9f193210681b86b6b92840ffe74f0c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c61a404325093250b676f40ad8f4dd00f3bcab5f\",\"lessThan\":\"ae68c0f7edbc9a294094ce03a0aaf45aa489ce40\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c61a404325093250b676f40ad8f4dd00f3bcab5f\",\"lessThan\":\"878ecb0897f4737a4c9401f3523fd49589025671\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/exthdrs_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.316\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.284\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.244\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.181\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.114\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.31\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.3.5\",\"lessThanOrEqual\":\"6.3.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.4\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H\",\"baseScore\":8.2,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":4.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/011f47c8b8389154f996f5f69da8efc3a3beefef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/04bf69e3de435d793a203aacc4b774f8f9f2baeb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/59e656d0d4a84ea0ee9a39c6f69160a3effccc94\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/878ecb0897f4737a4c9401f3523fd49589025671\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/91dd8aab9c9f193210681b86b6b92840ffe74f0c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9b92e2d0eb696d7586ba832c8854653b59887da0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ae68c0f7edbc9a294094ce03a0aaf45aa489ce40\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e5f82688ae10f5f386952e65e941bb8868ee54dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T16:47:20Z",
      "cve": "CVE-2023-53705",
      "id": "CVE-2023-53705",
      "initial_release_date": "2025-10-28T00:48:19Z",
      "product_status:known_affected": "503",
      "product_status:known_not_affected": "150",
      "product_status:recommended": "385",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53705",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53705.json",
      "version": "31"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.