GHSA-7PH7-58W3-W755

Vulnerability from github – Published: 2026-08-21 18:34 – Updated: 2026-08-25 06:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

net: ipv6: clear suppressed fib6 rule result

fib6_rule_suppress() drops a suppressed route with ip6_rt_put_flags(), but leaves res->rt6 pointing at the released rt6_info.

If no later rule supplies a replacement, fib6_rule_lookup() still sees res.rt6 and returns that stale dst to its caller. A suppressing rule can therefore leak a released route back to rt6_lookup(), and the next put hits rcuref_put_slowpath() from dst_release().

Clear res->rt6 when suppressing the route so suppressed lookups fall through to the null dst instead of reusing the released one.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-74581"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-21T17:16:44Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv6: clear suppressed fib6 rule result\n\nfib6_rule_suppress() drops a suppressed route with ip6_rt_put_flags(),\nbut leaves res-\u003ert6 pointing at the released rt6_info.\n\nIf no later rule supplies a replacement, fib6_rule_lookup() still sees\nres.rt6 and returns that stale dst to its caller. A suppressing rule can\ntherefore leak a released route back to rt6_lookup(), and the next put\nhits rcuref_put_slowpath() from dst_release().\n\nClear res-\u003ert6 when suppressing the route so suppressed lookups fall\nthrough to the null dst instead of reusing the released one.",
  "id": "GHSA-7ph7-58w3-w755",
  "modified": "2026-08-25T06:31:21Z",
  "published": "2026-08-21T18:34:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74581"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/354db6243eca59e9d187ffbf8b7955b044ce84dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d29b286c9de0b309e94b9ed083aa1a2f429434f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6aea62e433fe1b586202a5fee8b5807ce635e1d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d98c70fe0ba8c7708bfd5b2a5174d2086775daa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/90c57310e266eb94e4a80d6b15a9ca131d2e82cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9bad152c42b37499162367fe47867411e62fffa3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a341c091ca0bfae377747b1b59a3bd8ebe18a937"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc3ab04220667f254f4348572b2a0b3febff89fb"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Detection rules are retrieved from Rulezet.