6lowpan: fix off-by-one in multicast context address compression
Summary
| CVE | CVE-2026-53263 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-25 09:16:44 UTC |
| Updated | 2026-06-25 09:16:44 UTC |
| 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. |
Risk And Classification
EPSS: 0.001720000 probability, percentile 0.068460000 (date 2026-06-25)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 5609c185f24dffca5f6a9c127106869da150be03 f24a58c72a45f4c109f3557a760cc4b60b7a6037 git | Not specified |
| CNA | Linux | Linux | affected 5609c185f24dffca5f6a9c127106869da150be03 da8cbb64b47e9066b40af0de170901caf17b768c git | Not specified |
| CNA | Linux | Linux | affected 5609c185f24dffca5f6a9c127106869da150be03 4485d79617520d84ba5a14515e2b5136007d6deb git | Not specified |
| CNA | Linux | Linux | affected 5609c185f24dffca5f6a9c127106869da150be03 06ce6fc106b16dec9b535950db626261be865e5b git | Not specified |
| CNA | Linux | Linux | affected 5609c185f24dffca5f6a9c127106869da150be03 dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af git | Not specified |
| CNA | Linux | Linux | affected 5609c185f24dffca5f6a9c127106869da150be03 c32f30ef5e66adbfa102348e2e8a23776eb007cb git | Not specified |
| CNA | Linux | Linux | affected 5609c185f24dffca5f6a9c127106869da150be03 da8808463882c3f3c357b072e25053c2121f1419 git | Not specified |
| CNA | Linux | Linux | affected 5609c185f24dffca5f6a9c127106869da150be03 2a58899d11009bffc7b4b32a571858f381121837 git | Not specified |
| CNA | Linux | Linux | affected 4.6 | Not specified |
| CNA | Linux | Linux | unaffected 4.6 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.259 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.210 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.176 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.143 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.94 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.36 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.13 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/06ce6fc106b16dec9b535950db626261be865e5b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/2a58899d11009bffc7b4b32a571858f381121837 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/4485d79617520d84ba5a14515e2b5136007d6deb | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/c32f30ef5e66adbfa102348e2e8a23776eb007cb | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/da8808463882c3f3c357b072e25053c2121f1419 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f24a58c72a45f4c109f3557a760cc4b60b7a6037 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/dcb1bec1c32ee5c3878354e087cf5dbee2b7c7af | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/da8cbb64b47e9066b40af0de170901caf17b768c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.