CVE-2026-53263 (GCVE-0-2026-53263)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39
VLAI
Title
6lowpan: fix off-by-one in multicast context address compression
Summary
In the Linux kernel, the following vulnerability has been resolved: 6lowpan: fix off-by-one in multicast context address compression The second memcpy in lowpan_iphc_mcast_ctx_addr_compress() uses &data[1] as destination and &ipaddr->s6_addr[11] as source, but both should be offset by one: &data[2] and &ipaddr->s6_addr[12] respectively. This off-by-one has two consequences: 1. data[1] is overwritten with s6_addr[11], corrupting the RIID field in the compressed multicast address 2. data[5] is never written, so uninitialized kernel stack memory is transmitted over the network via lowpan_push_hc_data(), leaking kernel stack contents The correct inline data layout must match what the decompression function lowpan_uncompress_multicast_ctx_daddr() expects: data[0..1] = s6_addr[1..2] (flags/scope + RIID) data[2..5] = s6_addr[12..15] (group ID) Also zero-initialize the data array as a defensive measure against similar bugs in the future.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5609c185f24dffca5f6a9c127106869da150be03 , < f24a58c72a45f4c109f3557a760cc4b60b7a6037 (git)
Affected: 5609c185f24dffca5f6a9c127106869da150be03 , < da8cbb64b47e9066b40af0de170901caf17b768c (git)
Affected: 5609c185f24dffca5f6a9c127106869da150be03 , < 4485d79617520d84ba5a14515e2b5136007d6deb (git)
Affected: 5609c185f24dffca5f6a9c127106869da150be03 , < 06ce6fc106b16dec9b535950db626261be865e5b (git)
Affected: 5609c185f24dffca5f6a9c127106869da150be03 , < dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af (git)
Affected: 5609c185f24dffca5f6a9c127106869da150be03 , < c32f30ef5e66adbfa102348e2e8a23776eb007cb (git)
Affected: 5609c185f24dffca5f6a9c127106869da150be03 , < da8808463882c3f3c357b072e25053c2121f1419 (git)
Affected: 5609c185f24dffca5f6a9c127106869da150be03 , < 2a58899d11009bffc7b4b32a571858f381121837 (git)
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Linux Linux Affected: 4.6
Unaffected: 0 , < 4.6 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\n6lowpan: fix off-by-one in multicast context address compression\n\nThe second memcpy in lowpan_iphc_mcast_ctx_addr_compress() uses\n\u0026data[1] as destination and \u0026ipaddr-\u003es6_addr[11] as source, but\nboth should be offset by one: \u0026data[2] and \u0026ipaddr-\u003es6_addr[12]\nrespectively.\n\nThis off-by-one has two consequences:\n1. data[1] is overwritten with s6_addr[11], corrupting the RIID\n   field in the compressed multicast address\n2. data[5] is never written, so uninitialized kernel stack memory\n   is transmitted over the network via lowpan_push_hc_data(),\n   leaking kernel stack contents\n\nThe correct inline data layout must match what the decompression\nfunction lowpan_uncompress_multicast_ctx_daddr() expects:\n  data[0..1] = s6_addr[1..2]  (flags/scope + RIID)\n  data[2..5] = s6_addr[12..15] (group ID)\n\nAlso zero-initialize the data array as a defensive measure against\nsimilar bugs in the future."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-06-25T08:39:51.215Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53263",
    "datePublished": "2026-06-25T08:39:51.215Z",
    "dateReserved": "2026-06-09T07:44:35.394Z",
    "dateUpdated": "2026-06-25T08:39:51.215Z",
    "state": "PUBLISHED"
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contents\\n\\nThe correct inline data layout must match what the decompression\\nfunction lowpan_uncompress_multicast_ctx_daddr() expects:\\n  data[0..1] = s6_addr[1..2]  (flags/scope + RIID)\\n  data[2..5] = s6_addr[12..15] (group ID)\\n\\nAlso zero-initialize the data array as a defensive measure against\\nsimilar bugs in the 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  }
}


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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

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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.