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

Vulnerability from cvelistv5 – Published: 2026-05-08 13:37 – Updated: 2026-08-05 12:27
VLAI
Title
net/ipv6: ioam6: prevent schema length wraparound in trace fill
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
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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)
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    "redhat_vex": {
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      "current_release_date": "2026-07-08T11:38:55+00:00",
      "cve": "CVE-2026-43341",
      "id": "CVE-2026-43341",
      "initial_release_date": "2026-05-08T00:00:00+00:00",
      "product_status:fixed": "616",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/ipv6: ioam6: prevent schema length wraparound in trace fill",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43341.json",
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      "product_status:first_fixed": "2",
      "product_status:known_affected": "424",
      "product_status:known_not_affected": "279",
      "product_status:recommended": "321",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43341",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43341.json",
      "version": "26"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.