Vulnerability-Lookup

FKIE_CVE-2026-43341

Vulnerability from fkie_nvd - Published: 2026-05-08 14:16 - Updated: 2026-06-19 13:16

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: net/ipv6: ioam6: prevent schema length wraparound in trace fill ioam6_fill_trace_data() stores the schema contribution to the trace length in a u8. With bit 22 enabled and the largest schema payload, sclen becomes 1 + 1020 / 4, wraps from 256 to 0, and bypasses the remaining-space check. __ioam6_fill_trace_data() then positions the write cursor without reserving the schema area but still copies the 4-byte schema header and the full schema payload, overrunning the trace buffer. Keep sclen in an unsigned int so the remaining-space check and the write cursor calculation both see the full schema length.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/184d2e9db27c0f76226b5cad16fe29510a5d2280	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5e67ba9bb531e1ec6599a82a065dea9040b9ce50	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/77695a69baca9b99d95fad09fc78c2318736604f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d1b041080086e91d3733a5438a8c51ad5d3d8e09	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e96d48b37708d53cbdc47f6f60b0714fc4a5f596	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

{
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          "product": "Linux",
          "programFiles": [
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/ipv6: ioam6: prevent schema length wraparound in trace fill\n\nioam6_fill_trace_data() stores the schema contribution to the trace\nlength in a u8. With bit 22 enabled and the largest schema payload,\nsclen becomes 1 + 1020 / 4, wraps from 256 to 0, and bypasses the\nremaining-space check. __ioam6_fill_trace_data() then positions the\nwrite cursor without reserving the schema area but still copies the\n4-byte schema header and the full schema payload, overrunning the trace\nbuffer.\n\nKeep sclen in an unsigned int so the remaining-space check and the write\ncursor calculation both see the full schema length."
    }
  ],
  "id": "CVE-2026-43341",
  "lastModified": "2026-06-19T13:16:29.810",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
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        "impactScore": 5.9,
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        "type": "Secondary"
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  "published": "2026-05-08T14:16:44.050",
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        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-43341 (GCVE-0-2026-43341)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:37 – Updated: 2026-08-05 12:27

Title

net/ipv6: ioam6: prevent schema length wraparound in trace fill

Summary

Severity

9.8 (Critical)


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

Assigner

Linux CNA under the mitre root

CNA scorecard D 54/100 over 6624 records in the last 180 days details

References

7 references

URL	Tags
https://git.kernel.org/stable/c/d3a1fb2ca323d7a4e…
https://git.kernel.org/stable/c/e96d48b37708d53cb…
https://git.kernel.org/stable/c/d1b041080086e91d3…
https://git.kernel.org/stable/c/77695a69baca9b99d…
https://git.kernel.org/stable/c/184d2e9db27c0f762…
https://git.kernel.org/stable/c/d6e1c9b02d85a4f1f…
https://git.kernel.org/stable/c/5e67ba9bb531e1ec6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8c6f6fa6772696be0c047a711858084b38763728 , < d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2 (git) Affected: 8c6f6fa6772696be0c047a711858084b38763728 , < e96d48b37708d53cbdc47f6f60b0714fc4a5f596 (git) Affected: 8c6f6fa6772696be0c047a711858084b38763728 , < d1b041080086e91d3733a5438a8c51ad5d3d8e09 (git) Affected: 8c6f6fa6772696be0c047a711858084b38763728 , < 77695a69baca9b99d95fad09fc78c2318736604f (git) Affected: 8c6f6fa6772696be0c047a711858084b38763728 , < 184d2e9db27c0f76226b5cad16fe29510a5d2280 (git) Affected: 8c6f6fa6772696be0c047a711858084b38763728 , < d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d (git) Affected: 8c6f6fa6772696be0c047a711858084b38763728 , < 5e67ba9bb531e1ec6599a82a065dea9040b9ce50 (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.134 , ≤ 6.6.* (semver) Unaffected: 6.12.81 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ioam6.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/ipv6: ioam6: prevent schema length wraparound in trace fill\n\nioam6_fill_trace_data() stores the schema contribution to the trace\nlength in a u8. With bit 22 enabled and the largest schema payload,\nsclen becomes 1 + 1020 / 4, wraps from 256 to 0, and bypasses the\nremaining-space check. __ioam6_fill_trace_data() then positions the\nwrite cursor without reserving the schema area but still copies the\n4-byte schema header and the full schema payload, overrunning the trace\nbuffer.\n\nKeep sclen in an unsigned int so the remaining-space check and the write\ncursor calculation both see the full schema length."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - Inbound IPv6 Hop-by-Hop IOAM packets reach `ipv6_hop_ioam()` and then `ioam6_fill_trace_data()` on an IOAM-enabled interface. In a reasonable IOAM deployment with an active max-size schema, the triggering packet is network-delivered and unauthenticated.\nAC:L - There is no race or timing requirement; the attacker supplies a malformed IOAM trace with bit 22 set and insufficient remaining trace space. The required IOAM/schema configuration is part of the affected deployment scenario, and triggering is otherwise deterministic.\nPR:N - The inbound packet path does not require the sender to hold kernel privileges or authenticate. Although configuring IOAM namespaces/schemas requires administrative capability, a remote attacker can trigger the bug against an already configured IOAM node.\nUI:N - No victim user action is required after the affected IOAM node is configured. Packet receipt alone invokes the vulnerable trace fill path.\nS:U - The corruption occurs within the Linux kernel networking stack and impacts the same kernel security authority. This is not a guest-to-host, IOMMU, or other cross-scope boundary bypass.\nC:H - The bug is a heap/out-of-bounds write from the skb trace area caused by schema length wraparound. Kernel memory corruption can be leveraged to expose sensitive kernel memory or build stronger primitives.\nI:H - The vulnerable path copies the 4-byte schema header and up to 1020 bytes of schema data past the reserved trace buffer. This is a high-impact out-of-bounds write with potential for arbitrary kernel memory corruption/control-flow exploitation.\nA:H - The overflow can corrupt adjacent skb/kernel heap memory and is expected to cause kernel oops, panic, or networking instability. It can be triggered repeatedly with crafted packets in the affected deployment."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:27:21.749Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/e96d48b37708d53cbdc47f6f60b0714fc4a5f596"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1b041080086e91d3733a5438a8c51ad5d3d8e09"
        },
        {
          "url": "https://git.kernel.org/stable/c/77695a69baca9b99d95fad09fc78c2318736604f"
        },
        {
          "url": "https://git.kernel.org/stable/c/184d2e9db27c0f76226b5cad16fe29510a5d2280"
        },
        {
          "url": "https://git.kernel.org/stable/c/d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e67ba9bb531e1ec6599a82a065dea9040b9ce50"
        }
      ],
      "title": "net/ipv6: ioam6: prevent schema length wraparound in trace fill",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43341",
    "datePublished": "2026-05-08T13:37:19.256Z",
    "dateReserved": "2026-05-01T14:12:56.003Z",
    "dateUpdated": "2026-08-05T12:27:21.749Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

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FKIE_CVE-2026-43341

CVE-2026-43341 (GCVE-0-2026-43341)

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