CVE-2026-43186
published 2026-05-06CVE-2026-43186: 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…
PriorityP357critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.64%
46.7th percentile
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).
Affected
60 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 < f4d9d4b8fd839719d564651671e24c62c545c23b | f4d9d4b8fd839719d564651671e24c62c545c23b |
| linux | linux | >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 < fb3c662fafebc5b9d74417ed1de8759f6bb72143 | fb3c662fafebc5b9d74417ed1de8759f6bb72143 |
| linux | linux | >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 < 632d233cf2e64a46865ae2c064ae3c9df7c8864f | 632d233cf2e64a46865ae2c064ae3c9df7c8864f |
| linux | linux | >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 < 0591d6509c2ff13f09ea2998434aba0c0472e978 | 0591d6509c2ff13f09ea2998434aba0c0472e978 |
| linux | linux | >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 < e90346a2f1e8917d5760a44a1f61c44e3b36d96b | e90346a2f1e8917d5760a44a1f61c44e3b36d96b |
| linux | linux | >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 < ea3632aefc04205436868541638e26f4a74d5637 | ea3632aefc04205436868541638e26f4a74d5637 |
| linux | linux | >= 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 < 6db8b56eed62baacaf37486e83378a72635c04cc | 6db8b56eed62baacaf37486e83378a72635c04cc |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 5.15 < 5.15.202 | 5.15.202 |
| linux | linux_kernel | >= 5.16 < 6.1.165 | 6.1.165 |
| linux | linux_kernel | >= 6.13 < 6.18.16 | 6.18.16 |
| linux | linux_kernel | >= 6.19 < 6.19.6 | 6.19.6 |
| linux | linux_kernel | >= 6.2 < 6.6.128 | 6.6.128 |
| linux | linux_kernel | >= 6.7 < 6.12.75 | 6.12.75 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-aws-5.15 | — | — |
| ubuntu | linux-aws-6.8 | — | — |
| ubuntu | linux-aws-fips | — | — |
| ubuntu | linux-azure | — | — |
| ubuntu | linux-azure-5.15 | — | — |
| ubuntu | linux-azure-fde-5.15 | — | — |
| ubuntu | linux-azure-fips | — | — |
| ubuntu | linux-fips | — | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_ubuntu8.8HIGH
vendor_redhat7.0HIGH
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Red Hat
kernel: ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()
vendor_redhat·2026-05-06·CVSS 7.0
CVE-2026-43186 [HIGH] CWE-1284 kernel: ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()
kernel: ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()
A flaw was found in the Linux kernel's IPv6 In-situ Operations, Administration, and Maintenance (IOAM) functionality. A remote attacker can send a specially crafted packet that manipulates the `nodelen` field while processing trace data. This manipulation leads to a heap buffer overflow, causing approximately 100 bytes to be written past the allocated memory region. This memory corruption can result in a kernel panic, effectively leading to a Denial of Service (DoS) for the affected system.
Package: kernel (Red Hat Enterprise Linux 10) - Affected
Package: kernel (Red Hat Enterprise Linux 6) - Under investigation
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-rt (Red Hat Enterprise Li
GHSA
GHSA-8x8h-4g2v-qpf2: In the Linux kernel, the following vulnerability has been resolved:
ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()
On the receive
ghsa_unreviewed·2026-05-06
CVE-2026-43186 GHSA-8x8h-4g2v-qpf2: In the Linux kernel, the following vulnerability has been resolved:
ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()
On the receive
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
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/0591d6509c2ff13f09ea2998434aba0c0472e978https://git.kernel.org/stable/c/632d233cf2e64a46865ae2c064ae3c9df7c8864fhttps://git.kernel.org/stable/c/6db8b56eed62baacaf37486e83378a72635c04cchttps://git.kernel.org/stable/c/e90346a2f1e8917d5760a44a1f61c44e3b36d96bhttps://git.kernel.org/stable/c/ea3632aefc04205436868541638e26f4a74d5637https://git.kernel.org/stable/c/f4d9d4b8fd839719d564651671e24c62c545c23bhttps://git.kernel.org/stable/c/fb3c662fafebc5b9d74417ed1de8759f6bb72143
2026-05-06
Published