{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "a5d45bc0dc50f9dd83703510e9804d813a9cac32"
            },
            {
              "fixed": "3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7"
            },
            {
              "fixed": "8720df4504e0ed1781a702f65251bd47b3534d5e"
            },
            {
              "fixed": "363c3a84a946d53e5e121c9f47c7c2b7d228c46b"
            },
            {
              "fixed": "b19b5d2e042c294e2cc1c908dc598f9d64015396"
            },
            {
              "fixed": "a375d8ace807767f29f276b681b6324c74929b1d"
            },
            {
              "fixed": "16b553c46e347bc9de9946c4960654d5884a86de"
            },
            {
              "fixed": "630295d5bba1d0e0f494cc459452eb0a0058c545"
            },
            {
              "fixed": "39e88f28fb32bf02bd4b525c24c842c9cff5663d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "5c2b4b4f9fa5b765b927e361e3d310bcb5773015"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.9.14"
            },
            {
              "fixed": "5.10"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.10.0"
            },
            {
              "fixed": "5.10.265"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.216"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.183"
            }
          ],
          "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/2026/74xxx/CVE-2026-74579.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_payload: fix mask build for partial field offload\n\nnft_payload_offload_mask() builds the offload match mask for a payload\nexpression that covers only part of a header field.  For a partial IPv6\naddress match (field_len = 16, priv_len = 1) that shift is 1 \u003c\u003c 120, which\nis undefined on the 32-bit int operand.  It also trims only one word, so\nthe remaining words stay 0xffffffff (and when priv_len is a multiple of 4\nthe trim is skipped entirely), leaving the mask covering more bytes than\nthe rule matches.\n\n  UBSAN: shift-out-of-bounds in net/netfilter/nft_payload.c:278:20\n  shift exponent 120 is too large for 32-bit type 'int'\n  ...\n\nThe match is byte-granular and struct nft_data is zero-initialised, so the\ncorrect mask is simply the first priv_len bytes set to 0xff. Set those\nbytes directly and drop the word/shift trimming; this removes the undefined\nshift and no longer over-masks the trailing bytes.",
  "id": "CVE-2026-74579",
  "modified": "2026-08-27T11:31:01.614281099Z",
  "published": "2026-08-17T05:28:27.768Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16b553c46e347bc9de9946c4960654d5884a86de"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/363c3a84a946d53e5e121c9f47c7c2b7d228c46b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/39e88f28fb32bf02bd4b525c24c842c9cff5663d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/630295d5bba1d0e0f494cc459452eb0a0058c545"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8720df4504e0ed1781a702f65251bd47b3534d5e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a375d8ace807767f29f276b681b6324c74929b1d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b19b5d2e042c294e2cc1c908dc598f9d64015396"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74579.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74579"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "netfilter: nft_payload: fix mask build for partial field offload"
}