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.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 5609c185f24dffca5f6a9c127106869da150be03 to <f24a58c72a45f4c109f3557a760cc4b60b7a6037; 5609c185f24dffca5f6a9c127106869da150be03 to <da8cbb64b47e9066b40af0de170901caf17b768c; 5609c185f24dffca5f6a9c127106869da150be03 to <4485d79617520d84ba5a14515e2b5136007d6deb; 5609c185f24dffca5f6a9c127106869da150be03 to <06ce6fc106b16dec9b535950db626261be865e5b; 5609c185f24dffca5f6a9c127106869da150be03 to <dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af; 5609c185f24dffca5f6a9c127106869da150be03 to <c32f30ef5e66adbfa102348e2e8a23776eb007cb; 5609c185f24dffca5f6a9c127106869da150be03 to <da8808463882c3f3c357b072e25053c2121f1419; 5609c185f24dffca5f6a9c127106869da150be03 to <2a58899d11009bffc7b4b32a571858f381121837 |
| Linux | Linux | 4.6; 0 to <4.6; 5.10.259 to <=5.10.*; 5.15.210 to <=5.15.*; 6.1.176 to <=6.1.*; 6.6.143 to <=6.6.*; 6.12.94 to <=6.12.*; 6.18.36 to <=6.18.*; 7.0.13 to <=7.0.*; 7.1 to <=* |
References
- https://git.kernel.org/stable/c/f24a58c72a45f4c109f3557a760cc4b60b7a6037
- https://git.kernel.org/stable/c/da8cbb64b47e9066b40af0de170901caf17b768c
- https://git.kernel.org/stable/c/4485d79617520d84ba5a14515e2b5136007d6deb
- https://git.kernel.org/stable/c/06ce6fc106b16dec9b535950db626261be865e5b
- https://git.kernel.org/stable/c/dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af
- https://git.kernel.org/stable/c/c32f30ef5e66adbfa102348e2e8a23776eb007cb
- https://git.kernel.org/stable/c/da8808463882c3f3c357b072e25053c2121f1419
- https://git.kernel.org/stable/c/2a58899d11009bffc7b4b32a571858f381121837
Generated from the official CVE List on 25 Jun 2026 10:14 UTC.