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FKIE_CVE-2026-80892

Vulnerability from fkie_nvd - Published: 2026-09-04 18:17 - Updated: 2026-09-04 18:17
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c676903cb2a61992ded8e7907609cc6b0f11744
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5aaa06dfc10f8398c8807453dbec738ea9af10e4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/682cb3ece37fc5141e73bc726ccf4adb833e5189
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c9b47e6b23114e939b17f818471c7a46e59006e7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e52da169b8c0d19bb2d803f2a07fe0e5a00462d6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e8b3d09aa8889dda9be9cbb3d2f0218c4b9acde4
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/Kconfig",
            "fs/erofs/decompressor_lzma.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "682cb3ece37fc5141e73bc726ccf4adb833e5189",
              "status": "affected",
              "version": "622ceaddb7649ca328832f50ba1400af778d75fa",
              "versionType": "git"
            },
            {
              "lessThan": "e8b3d09aa8889dda9be9cbb3d2f0218c4b9acde4",
              "status": "affected",
              "version": "622ceaddb7649ca328832f50ba1400af778d75fa",
              "versionType": "git"
            },
            {
              "lessThan": "0c676903cb2a61992ded8e7907609cc6b0f11744",
              "status": "affected",
              "version": "622ceaddb7649ca328832f50ba1400af778d75fa",
              "versionType": "git"
            },
            {
              "lessThan": "5aaa06dfc10f8398c8807453dbec738ea9af10e4",
              "status": "affected",
              "version": "622ceaddb7649ca328832f50ba1400af778d75fa",
              "versionType": "git"
            },
            {
              "lessThan": "e52da169b8c0d19bb2d803f2a07fe0e5a00462d6",
              "status": "affected",
              "version": "622ceaddb7649ca328832f50ba1400af778d75fa",
              "versionType": "git"
            },
            {
              "lessThan": "c9b47e6b23114e939b17f818471c7a46e59006e7",
              "status": "affected",
              "version": "622ceaddb7649ca328832f50ba1400af778d75fa",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/Kconfig",
            "fs/erofs/decompressor_lzma.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.184",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-80892",
  "lastModified": "2026-09-04T18:17:57.337",
  "metrics": {},
  "published": "2026-09-04T18:17:57.337",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0c676903cb2a61992ded8e7907609cc6b0f11744"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5aaa06dfc10f8398c8807453dbec738ea9af10e4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/682cb3ece37fc5141e73bc726ccf4adb833e5189"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c9b47e6b23114e939b17f818471c7a46e59006e7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e52da169b8c0d19bb2d803f2a07fe0e5a00462d6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e8b3d09aa8889dda9be9cbb3d2f0218c4b9acde4"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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