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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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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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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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\"6.19\",\"versionEndExcluding\":\"7.0.13\",\"matchCriteriaId\":\"6A64BF9F-3BCA-42FD-98CB-8F03474D2B1E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"B1EF7059-E670-45F4-B422-54C40FA86390\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D38F0BF-A728-4133-A358-D44A2F7EE6D6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"EC732D08-5F7B-46D9-B154-E60C7F4F0A97\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"E5910A9D-F60A-409A-B486-FE66BFEBA9B9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"81DFF19E-9CF8-49C6-8C36-1E4038622933\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"B0E8FC71-3952-444C-83E9-718DBBBEC615\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/06ce6fc106b16dec9b535950db626261be865e5b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2a58899d11009bffc7b4b32a571858f381121837\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4485d79617520d84ba5a14515e2b5136007d6deb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c32f30ef5e66adbfa102348e2e8a23776eb007cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/da8808463882c3f3c357b072e25053c2121f1419\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/da8cbb64b47e9066b40af0de170901caf17b768c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f24a58c72a45f4c109f3557a760cc4b60b7a6037\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-08T04:15:14+00:00",
      "cve": "CVE-2026-53263",
      "id": "CVE-2026-53263",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: 6lowpan: fix off-by-one in multicast context address compression",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53263.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T16:56:10Z",
      "cve": "CVE-2026-53263",
      "id": "CVE-2026-53263",
      "initial_release_date": "2026-06-26T02:08:12Z",
      "product_status:first_fixed": "67",
      "product_status:known_affected": "360",
      "product_status:known_not_affected": "6",
      "product_status:recommended": "163",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53263",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53263.json",
      "version": "8"
    }
  }
}



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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.