CVE-2026-53263 - 6lowpan: fix off-by-one in multicast context address compression

CVE-2026-53263 - 6lowpan: fix off-by-one in multicast context address compression

https://cvefeed.io/rssfeed/latest.atom / Thu, 06/25/2026 - 16:01
CVE ID :CVE-2026-53263
Published : June 25, 2026, 8:39 a.m. | 5 hours, 1 minute ago
Description :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: 0.0 | NA
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