{"api_version":"1","generated_at":"2026-06-26T20:54:51+00:00","cve":"CVE-2026-53263","urls":{"html":"https://cve.report/CVE-2026-53263","api":"https://cve.report/api/cve/CVE-2026-53263.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53263","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53263"},"summary":{"title":"6lowpan: fix off-by-one in multicast context address compression","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-25 09:16:44","updated_at":"2026-06-25 09:16:44"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/06ce6fc106b16dec9b535950db626261be865e5b","name":"https://git.kernel.org/stable/c/06ce6fc106b16dec9b535950db626261be865e5b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2a58899d11009bffc7b4b32a571858f381121837","name":"https://git.kernel.org/stable/c/2a58899d11009bffc7b4b32a571858f381121837","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4485d79617520d84ba5a14515e2b5136007d6deb","name":"https://git.kernel.org/stable/c/4485d79617520d84ba5a14515e2b5136007d6deb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c32f30ef5e66adbfa102348e2e8a23776eb007cb","name":"https://git.kernel.org/stable/c/c32f30ef5e66adbfa102348e2e8a23776eb007cb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/da8808463882c3f3c357b072e25053c2121f1419","name":"https://git.kernel.org/stable/c/da8808463882c3f3c357b072e25053c2121f1419","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f24a58c72a45f4c109f3557a760cc4b60b7a6037","name":"https://git.kernel.org/stable/c/f24a58c72a45f4c109f3557a760cc4b60b7a6037","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af","name":"https://git.kernel.org/stable/c/dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/da8cbb64b47e9066b40af0de170901caf17b768c","name":"https://git.kernel.org/stable/c/da8cbb64b47e9066b40af0de170901caf17b768c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53263","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53263","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5609c185f24dffca5f6a9c127106869da150be03 f24a58c72a45f4c109f3557a760cc4b60b7a6037 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5609c185f24dffca5f6a9c127106869da150be03 da8cbb64b47e9066b40af0de170901caf17b768c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5609c185f24dffca5f6a9c127106869da150be03 4485d79617520d84ba5a14515e2b5136007d6deb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5609c185f24dffca5f6a9c127106869da150be03 06ce6fc106b16dec9b535950db626261be865e5b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.94 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.36 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.13 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"53263","cve":"CVE-2026-53263","epss":"0.001720000","percentile":"0.068460000","score_date":"2026-06-25","updated_at":"2026-06-26 00:06:14"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/6lowpan/iphc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"f24a58c72a45f4c109f3557a760cc4b60b7a6037","status":"affected","version":"5609c185f24dffca5f6a9c127106869da150be03","versionType":"git"},{"lessThan":"da8cbb64b47e9066b40af0de170901caf17b768c","status":"affected","version":"5609c185f24dffca5f6a9c127106869da150be03","versionType":"git"},{"lessThan":"4485d79617520d84ba5a14515e2b5136007d6deb","status":"affected","version":"5609c185f24dffca5f6a9c127106869da150be03","versionType":"git"},{"lessThan":"06ce6fc106b16dec9b535950db626261be865e5b","status":"affected","version":"5609c185f24dffca5f6a9c127106869da150be03","versionType":"git"},{"lessThan":"dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af","status":"affected","version":"5609c185f24dffca5f6a9c127106869da150be03","versionType":"git"},{"lessThan":"c32f30ef5e66adbfa102348e2e8a23776eb007cb","status":"affected","version":"5609c185f24dffca5f6a9c127106869da150be03","versionType":"git"},{"lessThan":"da8808463882c3f3c357b072e25053c2121f1419","status":"affected","version":"5609c185f24dffca5f6a9c127106869da150be03","versionType":"git"},{"lessThan":"2a58899d11009bffc7b4b32a571858f381121837","status":"affected","version":"5609c185f24dffca5f6a9c127106869da150be03","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/6lowpan/iphc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.6"},{"lessThan":"4.6","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","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.36","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.94","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.36","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.13","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"4.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"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":{"engine":"bippy-1.2.0"}}},"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"},"nvd":{"publishedDate":"2026-06-25 09:16:44","lastModifiedDate":"2026-06-25 09:16:44","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53263","Ordinal":"1","Title":"6lowpan: fix off-by-one in multicast context address compression","CVE":"CVE-2026-53263","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53263","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"6lowpan: fix off-by-one in multicast context address compression"}]}}}