CVE-2026-53263
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…
Does this matter?
Lower severity and a low EPSS score (0.12%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.12% probability · 2th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-193
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
EPSS 0.1% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://git.kernel.org/stable/c/06ce6fc106b16dec9b535950db626261be865e5bPatch
- https://git.kernel.org/stable/c/2a58899d11009bffc7b4b32a571858f381121837Patch
- https://git.kernel.org/stable/c/4485d79617520d84ba5a14515e2b5136007d6debPatch
- https://git.kernel.org/stable/c/c32f30ef5e66adbfa102348e2e8a23776eb007cbPatch
- https://git.kernel.org/stable/c/da8808463882c3f3c357b072e25053c2121f1419Patch
- https://git.kernel.org/stable/c/da8cbb64b47e9066b40af0de170901caf17b768cPatch
- https://git.kernel.org/stable/c/dcb1bec1c32ee5c3878354e087cf5dbee2b7c7afPatch
- https://git.kernel.org/stable/c/f24a58c72a45f4c109f3557a760cc4b60b7a6037Patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.