In the Linux kernel, the following vulnerability has been resolved:
ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()
On the receive path, __ioam6_fill_trace_data() uses trace->nodelen
to decide how much data to write for each node. It trusts this field
as-is from the incoming packet, with no consistency check against
trace->type (the 24-bit field that tells which data items are
present). A crafted packet can set nodelen=0 while setting type bits
0-21, causing the function to write ~100 bytes past the allocated
region (into skb_shared_info), which corrupts adjacent heap memory
and leads to a kernel panic.
Add a shared helper ioam6_trace_compute_nodelen() in ioam6.c to
derive the expected nodelen from the type field, and use it:
- in ioam6_iptunnel.c (send path, existing validation) to replace
the open-coded computation;
- in exthdrs.c (receive path, ipv6_hop_ioam) to drop packets whose
nodelen is inconsistent with the type field, before any data is
written.
Per RFC 9197, bits 12-21 are each short (4-octet) fields, so they
are included in IOAM6_MASK_SHORT_FIELDS (changed from 0xff100000 to
0xff1ffc00).
References
Configurations
Configuration 1 (hide)
|
History
11 May 2026, 20:40
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-787 | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| References | () https://git.kernel.org/stable/c/0591d6509c2ff13f09ea2998434aba0c0472e978 - Patch | |
| References | () https://git.kernel.org/stable/c/632d233cf2e64a46865ae2c064ae3c9df7c8864f - Patch | |
| References | () https://git.kernel.org/stable/c/6db8b56eed62baacaf37486e83378a72635c04cc - Patch | |
| References | () https://git.kernel.org/stable/c/e90346a2f1e8917d5760a44a1f61c44e3b36d96b - Patch | |
| References | () https://git.kernel.org/stable/c/ea3632aefc04205436868541638e26f4a74d5637 - Patch | |
| References | () https://git.kernel.org/stable/c/f4d9d4b8fd839719d564651671e24c62c545c23b - Patch | |
| References | () https://git.kernel.org/stable/c/fb3c662fafebc5b9d74417ed1de8759f6bb72143 - Patch | |
| First Time |
Linux linux Kernel
Linux |
08 May 2026, 13:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 9.8 |
06 May 2026, 12:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-06 12:16
Updated : 2026-05-11 20:40
NVD link : CVE-2026-43186
Mitre link : CVE-2026-43186
CVE.ORG link : CVE-2026-43186
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-787
Out-of-bounds Write