CVE-2026-80892 (GCVE-0-2026-80892)
Vulnerability from cvelistv5
Published
2026-09-04 17:11
Modified
2026-09-04 17:11
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: erofs: cap LZMA stream pool size fs/erofs/decompressor_lzma.c sizes the module-global MicroLZMA stream pool from num_possible_cpus() when the lzma_streams module parameter is unset, then z_erofs_load_lzma_config() preallocates one image-supplied dictionary per stream, accepting dictionaries up to 8 MiB. On high-CPU systems, a small EROFS image can pin hundreds of MiB of vmalloc-backed decoder state until the erofs module is unloaded. Impact: An EROFS image mounted by the system can pin up to 8 MiB of vmalloc memory per LZMA stream, either as intended or unexpectedly. Bound the default stream count by a new CONFIG_EROFS_FS_ZIP_LZMA_DEFAULT_MAX_STREAMS option, default 16, so the worst-case default preallocation is 128 MiB if the number of CPUs is no less than 16 while preserving the existing per-image dictionary limit. An explicit lzma_streams module parameter is still honoured as-is, so administrators who deliberately size the pool are not affected.
References
Impacted products
Vendor Product Version
Linux Linux Version: 622ceaddb7649ca328832f50ba1400af778d75fa
Version: 622ceaddb7649ca328832f50ba1400af778d75fa
Version: 622ceaddb7649ca328832f50ba1400af778d75fa
Version: 622ceaddb7649ca328832f50ba1400af778d75fa
Version: 622ceaddb7649ca328832f50ba1400af778d75fa
Version: 622ceaddb7649ca328832f50ba1400af778d75fa
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/Kconfig",
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: cap LZMA stream pool size\n\nfs/erofs/decompressor_lzma.c sizes the module-global MicroLZMA stream\npool from num_possible_cpus() when the lzma_streams module parameter is\nunset, then z_erofs_load_lzma_config() preallocates one image-supplied\ndictionary per stream, accepting dictionaries up to 8 MiB.  On high-CPU\nsystems, a small EROFS image can pin hundreds of MiB of vmalloc-backed\ndecoder state until the erofs module is unloaded.\n\nImpact: An EROFS image mounted by the system can pin up to 8 MiB of\nvmalloc memory per LZMA stream, either as intended or unexpectedly.\n\nBound the default stream count by a new\nCONFIG_EROFS_FS_ZIP_LZMA_DEFAULT_MAX_STREAMS option, default 16, so the\nworst-case default preallocation is 128 MiB if the number of CPUs is no\nless than 16 while preserving the existing per-image dictionary limit.\nAn explicit lzma_streams module parameter is still honoured as-is, so\nadministrators who deliberately size the pool are not affected."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T17:11:08.391Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/682cb3ece37fc5141e73bc726ccf4adb833e5189"
        },
        {
          "url": "https://git.kernel.org/stable/c/e8b3d09aa8889dda9be9cbb3d2f0218c4b9acde4"
        },
        {
          "url": "https://git.kernel.org/stable/c/0c676903cb2a61992ded8e7907609cc6b0f11744"
        },
        {
          "url": "https://git.kernel.org/stable/c/5aaa06dfc10f8398c8807453dbec738ea9af10e4"
        },
        {
          "url": "https://git.kernel.org/stable/c/e52da169b8c0d19bb2d803f2a07fe0e5a00462d6"
        },
        {
          "url": "https://git.kernel.org/stable/c/c9b47e6b23114e939b17f818471c7a46e59006e7"
        }
      ],
      "title": "erofs: cap LZMA stream pool size",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80892",
    "datePublished": "2026-09-04T17:11:08.391Z",
    "dateReserved": "2026-08-26T14:34:25.800Z",
    "dateUpdated": "2026-09-04T17:11:08.391Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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