{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53263", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.394Z", "datePublished": "2026-06-25T08:39:51.215Z", "dateUpdated": "2026-06-25T08:39:51.215Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-25T08:39:51.215Z"}, "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&data[1] as destination and &ipaddr->s6_addr[11] as source, but\nboth should be offset by one: &data[2] and &ipaddr->s6_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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/6lowpan/iphc.c"], "versions": [{"version": "5609c185f24dffca5f6a9c127106869da150be03", "lessThan": "f24a58c72a45f4c109f3557a760cc4b60b7a6037", "status": "affected", "versionType": "git"}, {"version": "5609c185f24dffca5f6a9c127106869da150be03", "lessThan": "da8cbb64b47e9066b40af0de170901caf17b768c", "status": "affected", "versionType": "git"}, {"version": "5609c185f24dffca5f6a9c127106869da150be03", "lessThan": "4485d79617520d84ba5a14515e2b5136007d6deb", "status": "affected", "versionType": "git"}, {"version": "5609c185f24dffca5f6a9c127106869da150be03", "lessThan": "06ce6fc106b16dec9b535950db626261be865e5b", "status": "affected", "versionType": "git"}, {"version": "5609c185f24dffca5f6a9c127106869da150be03", "lessThan": "dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af", "status": "affected", "versionType": "git"}, {"version": "5609c185f24dffca5f6a9c127106869da150be03", "lessThan": "c32f30ef5e66adbfa102348e2e8a23776eb007cb", "status": "affected", "versionType": "git"}, {"version": "5609c185f24dffca5f6a9c127106869da150be03", "lessThan": "da8808463882c3f3c357b072e25053c2121f1419", "status": "affected", "versionType": "git"}, {"version": "5609c185f24dffca5f6a9c127106869da150be03", "lessThan": "2a58899d11009bffc7b4b32a571858f381121837", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/6lowpan/iphc.c"], "versions": [{"version": "4.6", "status": "affected"}, {"version": "0", "lessThan": "4.6", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.13", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.10.259"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.15.210"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.12.94"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.18.36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.1"}]}]}], "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": {"engine": "bippy-1.2.0"}}}}

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