{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "6df90c02bae468a3a6110bafbc659884d0c4966c"
            },
            {
              "fixed": "3d1b4e2d8ac0a1a1390a117f61ce0ca1c47e3bcb"
            },
            {
              "fixed": "430a05cb926f6bdf53e81460a2c3a553257f3f61"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "6bc6ee31113b05db605694491bdeb2b1730142f1"
            },
            {
              "last_affected": "12caa73a28f0ae147ec0356b45091edf2462462b"
            },
            {
              "last_affected": "fc8943886629e26de34867db302c74d465510826"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.1.125"
            },
            {
              "fixed": "6.2"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.6.72"
            },
            {
              "fixed": "6.7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.12.10"
            },
            {
              "fixed": "6.13"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "7.0.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46130.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-verity-fec: fix reading parity bytes split across blocks (take 3)\n\nfec_decode_bufs() assumes that the parity bytes of the first RS codeword\nit decodes are never split across parity blocks.\n\nThis assumption is false.  Consider v-\u003efec-\u003eblock_size == 4096 \u0026\u0026\nv-\u003efec-\u003eroots == 17 \u0026\u0026 fio-\u003enbufs == 1, for example.  In that case, each\ncall to fec_decode_bufs() consumes v-\u003efec-\u003eroots * (fio-\u003enbufs \u003c\u003c\nDM_VERITY_FEC_BUF_RS_BITS) = 272 parity bytes.\n\nConsidering that the parity data for each message block starts on a\nblock boundary, the byte alignment in the parity data will iterate\nthrough 272*i mod 4096 until the 3 parity blocks have been consumed.  On\nthe 16th call (i=15), the alignment will be 4080 bytes into the first\nblock.  Only 16 bytes remain in that block, but 17 parity bytes will be\nneeded.  The code reads out-of-bounds from the parity block buffer.\n\nFortunately this doesn't normally happen, since it can occur only for\ncertain non-default values of fec_roots *and* when the maximum number of\nbuffers couldn't be allocated due to low memory.  For example with\nblock_size=4096 only the following cases are affected:\n\n    fec_roots=17: nbufs in [1, 3, 5, 15]\n    fec_roots=19: nbufs in [1, 229]\n    fec_roots=21: nbufs in [1, 3, 5, 13, 15, 39, 65, 195]\n    fec_roots=23: nbufs in [1, 89]\n\nRegardless, fix it by refactoring how the parity blocks are read.",
  "id": "CVE-2026-46130",
  "modified": "2026-07-08T05:37:55.667494923Z",
  "published": "2026-05-28T09:35:45.387Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d1b4e2d8ac0a1a1390a117f61ce0ca1c47e3bcb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/430a05cb926f6bdf53e81460a2c3a553257f3f61"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46130.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46130"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "dm-verity-fec: fix reading parity bytes split across blocks (take 3)"
}