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

Vulnerability from cvelistv5 – Published: 2026-05-08 13:37 – Updated: 2026-05-08 13:37
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 ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux 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: 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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          "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."
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}


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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.

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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.
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Detection rules are retrieved from Rulezet.