Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 5609c185f24dffca5f6a9c127106869da150be03 before f24a58c72a45f4c109f3557a760cc4b60b7a6037; affected 5609c185f24dffca5f6a9c127106869da150be03 before da8cbb64b47e9066b40af0de170901caf17b768c; affected 5609c185f24dffca5f6a9c127106869da150be03 before 4485d79617520d84ba5a14515e2b5136007d6deb; affected 5609c185f24dffca5f6a9c127106869da150be03 before 06ce6fc106b16dec9b535950db626261be865e5b; affected 5609c185f24dffca5f6a9c127106869da150be03 before dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af; affected 5609c185f24dffca5f6a9c127106869da150be03 before c32f30ef5e66adbfa102348e2e8a23776eb007cb; affected 5609c185f24dffca5f6a9c127106869da150be03 before da8808463882c3f3c357b072e25053c2121f1419; affected 5609c185f24dffca5f6a9c127106869da150be03 before 2a58899d11009bffc7b4b32a571858f381121837 |
| Linux / Linux | affected 4.6; unaffected 0 before 4.6; unaffected 5.10.259 through 5.10.*; unaffected 5.15.210 through 5.15.*; unaffected 6.1.176 through 6.1.*; unaffected 6.6.143 through 6.6.*; unaffected 6.12.94 through 6.12.*; unaffected 6.18.36 through 6.18.*; unaffected 7.0.13 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
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
ADP enrichment
No English description supplied.