{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e5dfb815181fcb186d6080ac3a091eadff2d98fe"
            },
            {
              "fixed": "19f2ecf8ea564562c7e7a919cf38068dd9aa1c96"
            },
            {
              "fixed": "3d054001860270748405a3f9270c5fa0bf7ffc19"
            },
            {
              "fixed": "fb31fbe51c233f3bf47021121f63d2e42cac2d08"
            },
            {
              "fixed": "0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a"
            },
            {
              "fixed": "6151159618198675e01c391676e579738286c135"
            },
            {
              "fixed": "f294fc71c4a0fa4964f6428a1b4e7929c1d83125"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.25"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74290.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_flow: Dont expose folded kernel pointers\n\nThe flow classifier falls back to addr_fold() for fields that are missing\nfrom packet headers. In map mode, userspace controls mask, xor, rshift,\naddend and divisor, and can observe the resulting classid through class\nstatistics. This allows a tc classifier in a user/network namespace to\nrecover the 32-bit folded value of skb-\u003esk, skb_dst() or skb_nfct().\n\nAlign with standard kernel practices for pointer hashing and replace the\nXOR folding with a keyed siphash (which is cryptographically secure)",
  "id": "CVE-2026-74290",
  "modified": "2026-08-18T03:31:11.290944823Z",
  "published": "2026-08-15T05:57:57.004Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/19f2ecf8ea564562c7e7a919cf38068dd9aa1c96"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d054001860270748405a3f9270c5fa0bf7ffc19"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6151159618198675e01c391676e579738286c135"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f294fc71c4a0fa4964f6428a1b4e7929c1d83125"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb31fbe51c233f3bf47021121f63d2e42cac2d08"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74290.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74290"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/sched: cls_flow: Dont expose folded kernel pointers"
}