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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{
"containers": {
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"version": "4.6"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.94",
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},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.36",
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},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.13",
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{
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"status": "unaffected",
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}
],
"cpeApplicability": [
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"nodes": [
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}
],
"negate": false,
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"descriptions": [
{
"lang": "en",
"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."
}
],
"providerMetadata": {
"dateUpdated": "2026-06-25T08:39:51.215Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/f24a58c72a45f4c109f3557a760cc4b60b7a6037"
},
{
"url": "https://git.kernel.org/stable/c/da8cbb64b47e9066b40af0de170901caf17b768c"
},
{
"url": "https://git.kernel.org/stable/c/4485d79617520d84ba5a14515e2b5136007d6deb"
},
{
"url": "https://git.kernel.org/stable/c/06ce6fc106b16dec9b535950db626261be865e5b"
},
{
"url": "https://git.kernel.org/stable/c/dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af"
},
{
"url": "https://git.kernel.org/stable/c/c32f30ef5e66adbfa102348e2e8a23776eb007cb"
},
{
"url": "https://git.kernel.org/stable/c/da8808463882c3f3c357b072e25053c2121f1419"
},
{
"url": "https://git.kernel.org/stable/c/2a58899d11009bffc7b4b32a571858f381121837"
}
],
"title": "6lowpan: fix off-by-one in multicast context address compression",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"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"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
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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