CVE-2026-43492 lib/crypto: mpi: Fix integer underflow in mpi_read_raw_from_sgl()

[
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    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "lib/crypto/mpi/mpicoder.c"
    ],
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    "programFiles": [
      "lib/crypto/mpi/mpicoder.c"
    ],
    "versions": [
      {
        "version": "4.4",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.4",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.6.140",
        "lessThanOrEqual": "6.6.*",
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      },
      {
        "version": "6.12.88",
        "lessThanOrEqual": "6.12.*",
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      {
        "version": "6.18.30",
        "lessThanOrEqual": "6.18.*",
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        "version": "7.0.7",
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      {
        "version": "7.1",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
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    ]
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]