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.
References
Configurations
Configuration 1 (hide)
|
History
08 Jul 2026, 04:02
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-193 | |
| First Time |
Linux linux Kernel
Linux |
|
| References | () https://git.kernel.org/stable/c/06ce6fc106b16dec9b535950db626261be865e5b - Patch | |
| References | () https://git.kernel.org/stable/c/2a58899d11009bffc7b4b32a571858f381121837 - Patch | |
| References | () https://git.kernel.org/stable/c/4485d79617520d84ba5a14515e2b5136007d6deb - Patch | |
| References | () https://git.kernel.org/stable/c/c32f30ef5e66adbfa102348e2e8a23776eb007cb - Patch | |
| References | () https://git.kernel.org/stable/c/da8808463882c3f3c357b072e25053c2121f1419 - Patch | |
| References | () https://git.kernel.org/stable/c/da8cbb64b47e9066b40af0de170901caf17b768c - Patch | |
| References | () https://git.kernel.org/stable/c/dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af - Patch | |
| References | () https://git.kernel.org/stable/c/f24a58c72a45f4c109f3557a760cc4b60b7a6037 - Patch | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:* |
25 Jun 2026, 09:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-06-25 09:16
Updated : 2026-07-08 04:02
NVD link : CVE-2026-53263
Mitre link : CVE-2026-53263
CVE.ORG link : CVE-2026-53263
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-193
Off-by-one Error