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6lowpan: fix off-by-one in multicast context address compression

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-53263

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-53263

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5609c185f24dffca5f6a9c127106869da150be03",
        "lessThan": "f24a58c72a45f4c109f3557a760cc4b60b7a6037",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5609c185f24dffca5f6a9c127106869da150be03",
        "lessThan": "da8cbb64b47e9066b40af0de170901caf17b768c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5609c185f24dffca5f6a9c127106869da150be03",
        "lessThan": "4485d79617520d84ba5a14515e2b5136007d6deb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5609c185f24dffca5f6a9c127106869da150be03",
        "lessThan": "06ce6fc106b16dec9b535950db626261be865e5b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5609c185f24dffca5f6a9c127106869da150be03",
        "lessThan": "dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5609c185f24dffca5f6a9c127106869da150be03",
        "lessThan": "c32f30ef5e66adbfa102348e2e8a23776eb007cb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5609c185f24dffca5f6a9c127106869da150be03",
        "lessThan": "da8808463882c3f3c357b072e25053c2121f1419",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5609c185f24dffca5f6a9c127106869da150be03",
        "lessThan": "2a58899d11009bffc7b4b32a571858f381121837",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/6lowpan/iphc.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.94",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.36",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/6lowpan/iphc.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53263

Source reference: /cveMetadata/cveId

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Event
#28446 · Revision 1
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