{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "622ceaddb7649ca328832f50ba1400af778d75fa"
            },
            {
              "fixed": "682cb3ece37fc5141e73bc726ccf4adb833e5189"
            },
            {
              "fixed": "e8b3d09aa8889dda9be9cbb3d2f0218c4b9acde4"
            },
            {
              "fixed": "0c676903cb2a61992ded8e7907609cc6b0f11744"
            },
            {
              "fixed": "5aaa06dfc10f8398c8807453dbec738ea9af10e4"
            },
            {
              "fixed": "e52da169b8c0d19bb2d803f2a07fe0e5a00462d6"
            },
            {
              "fixed": "c9b47e6b23114e939b17f818471c7a46e59006e7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.184"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.151"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.103"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.44"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80892.json"
  },
  "details": "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",
  "modified": "2026-09-06T03:30:56.794389225Z",
  "published": "2026-09-04T17:11:08.391Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c676903cb2a61992ded8e7907609cc6b0f11744"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5aaa06dfc10f8398c8807453dbec738ea9af10e4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/682cb3ece37fc5141e73bc726ccf4adb833e5189"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c9b47e6b23114e939b17f818471c7a46e59006e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e52da169b8c0d19bb2d803f2a07fe0e5a00462d6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e8b3d09aa8889dda9be9cbb3d2f0218c4b9acde4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80892.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80892"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "erofs: cap LZMA stream pool size"
}