CVE-2026-74290 (GCVE-0-2026-74290)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:16
VLAI
Title
net/sched: cls_flow: Dont expose folded kernel pointers
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_flow: Dont expose folded kernel pointers The flow classifier falls back to addr_fold() for fields that are missing from packet headers. In map mode, userspace controls mask, xor, rshift, addend and divisor, and can observe the resulting classid through class statistics. This allows a tc classifier in a user/network namespace to recover the 32-bit folded value of skb->sk, skb_dst() or skb_nfct(). Align with standard kernel practices for pointer hashing and replace the XOR folding with a keyed siphash (which is cryptographically secure)
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6992 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e5dfb815181fcb186d6080ac3a091eadff2d98fe , < 19f2ecf8ea564562c7e7a919cf38068dd9aa1c96 (git)
Affected: e5dfb815181fcb186d6080ac3a091eadff2d98fe , < 3d054001860270748405a3f9270c5fa0bf7ffc19 (git)
Affected: e5dfb815181fcb186d6080ac3a091eadff2d98fe , < fb31fbe51c233f3bf47021121f63d2e42cac2d08 (git)
Affected: e5dfb815181fcb186d6080ac3a091eadff2d98fe , < 0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a (git)
Affected: e5dfb815181fcb186d6080ac3a091eadff2d98fe , < 6151159618198675e01c391676e579738286c135 (git)
Affected: e5dfb815181fcb186d6080ac3a091eadff2d98fe , < f294fc71c4a0fa4964f6428a1b4e7929c1d83125 (git)
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Linux Linux Affected: 2.6.25
Unaffected: 0 , < 2.6.25 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/cls_flow.c"
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          "vendor": "Linux",
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              "status": "unaffected",
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              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.18.40",
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          "value": "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)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:16:36.420Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/19f2ecf8ea564562c7e7a919cf38068dd9aa1c96"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d054001860270748405a3f9270c5fa0bf7ffc19"
        },
        {
          "url": "https://git.kernel.org/stable/c/fb31fbe51c233f3bf47021121f63d2e42cac2d08"
        },
        {
          "url": "https://git.kernel.org/stable/c/0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a"
        },
        {
          "url": "https://git.kernel.org/stable/c/6151159618198675e01c391676e579738286c135"
        },
        {
          "url": "https://git.kernel.org/stable/c/f294fc71c4a0fa4964f6428a1b4e7929c1d83125"
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      "title": "net/sched: cls_flow: Dont expose folded kernel pointers",
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  "cveMetadata": {
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    "cveId": "CVE-2026-74290",
    "datePublished": "2026-08-15T05:57:57.004Z",
    "dateReserved": "2026-08-15T05:44:03.881Z",
    "dateUpdated": "2026-08-17T05:16:36.420Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-10-20",
      "epss": "0.00173",
      "percentile": "0.0629"
    },
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                "programFiles": [
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                ],
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        "cveTags": [],
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          {
            "lang": "en",
            "value": "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",
        "lastModified": "2026-08-17T06:19:22.973",
        "metrics": {},
        "published": "2026-08-15T06:22:28.570",
        "references": [
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          },
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T15:22:23+00:00",
      "cve": "CVE-2026-74290",
      "id": "CVE-2026-74290",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: cls_flow: Dont expose folded kernel pointers",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74290.json",
      "version": "3"
    }
  }
}



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