CVE-2026-43186 (GCVE-0-2026-43186)
Vulnerability from cvelistv5
Published
2026-05-06 11:27
Modified
2026-10-19 19:16
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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
Impacted products
Vendor Product Version
Linux Linux Version: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0
Version: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0
Version: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0
Version: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0
Version: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0
Version: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0
Version: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0
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}


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  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.