{"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"}}}}