ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()

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Summary

CVECVE-2026-43186
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 12:16:37 UTC
Updated2026-05-11 20:40:56 UTC
DescriptionIn 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).

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001810000 probability, percentile 0.393470000 (date 2026-05-12)

Problem Types: CWE-787

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 f4d9d4b8fd839719d564651671e24c62c545c23b git Not specified
CNA Linux Linux affected 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 fb3c662fafebc5b9d74417ed1de8759f6bb72143 git Not specified
CNA Linux Linux affected 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 632d233cf2e64a46865ae2c064ae3c9df7c8864f git Not specified
CNA Linux Linux affected 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 0591d6509c2ff13f09ea2998434aba0c0472e978 git Not specified
CNA Linux Linux affected 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 e90346a2f1e8917d5760a44a1f61c44e3b36d96b git Not specified
CNA Linux Linux affected 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 ea3632aefc04205436868541638e26f4a74d5637 git Not specified
CNA Linux Linux affected 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 6db8b56eed62baacaf37486e83378a72635c04cc git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 5.15.202 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.16 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.6 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0591d6509c2ff13f09ea2998434aba0c0472e978 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6db8b56eed62baacaf37486e83378a72635c04cc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/632d233cf2e64a46865ae2c064ae3c9df7c8864f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e90346a2f1e8917d5760a44a1f61c44e3b36d96b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fb3c662fafebc5b9d74417ed1de8759f6bb72143 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f4d9d4b8fd839719d564651671e24c62c545c23b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ea3632aefc04205436868541638e26f4a74d5637 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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