Heap-based buffer overflow in Linux kernel - CVE-2026-43186
Published: May 7, 2026
Vulnerability identifier: #VU130546
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-43186
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a heap-based buffer overflow in __ioam6_fill_trace_data() when processing a crafted incoming IPv6 IOAM packet on the receive path. A remote attacker can send a specially crafted packet to cause a denial of service.
A packet with an inconsistent nodelen field and type bits can trigger an out-of-bounds write of about 100 bytes into adjacent heap memory.
How to mitigate CVE-2026-43186
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/0591d6509c2ff13f09ea2998434aba0c0472e978
- https://git.kernel.org/stable/c/632d233cf2e64a46865ae2c064ae3c9df7c8864f
- https://git.kernel.org/stable/c/6db8b56eed62baacaf37486e83378a72635c04cc
- https://git.kernel.org/stable/c/e90346a2f1e8917d5760a44a1f61c44e3b36d96b
- https://git.kernel.org/stable/c/ea3632aefc04205436868541638e26f4a74d5637
- https://git.kernel.org/stable/c/f4d9d4b8fd839719d564651671e24c62c545c23b
- https://git.kernel.org/stable/c/fb3c662fafebc5b9d74417ed1de8759f6bb72143