CVE-2026-74581 (GCVE-0-2026-74581)

Vulnerability from cvelistv5 – Published: 2026-08-21 16:31 – Updated: 2026-08-25 05:40
VLAI
Title
net: ipv6: clear suppressed fib6 rule result
Summary
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
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 209d35ee34e25f9668c404350a1c86d914c54ffa , < 90c57310e266eb94e4a80d6b15a9ca131d2e82cb (git)
Affected: 8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383 , < 5d29b286c9de0b309e94b9ed083aa1a2f429434f (git)
Affected: cdef485217d30382f3bf6448c54b4401648fe3f1 , < 354db6243eca59e9d187ffbf8b7955b044ce84dc (git)
Affected: cdef485217d30382f3bf6448c54b4401648fe3f1 , < 6d98c70fe0ba8c7708bfd5b2a5174d2086775daa (git)
Affected: cdef485217d30382f3bf6448c54b4401648fe3f1 , < 9bad152c42b37499162367fe47867411e62fffa3 (git)
Affected: cdef485217d30382f3bf6448c54b4401648fe3f1 , < dc3ab04220667f254f4348572b2a0b3febff89fb (git)
Affected: cdef485217d30382f3bf6448c54b4401648fe3f1 , < a341c091ca0bfae377747b1b59a3bd8ebe18a937 (git)
Affected: cdef485217d30382f3bf6448c54b4401648fe3f1 , < 6aea62e433fe1b586202a5fee8b5807ce635e1d7 (git)
Affected: ee38eb8cf9a7323884c2b8e0adbbeb2192d31e29 (git)
Affected: 5.10.84 , < 5.10.265 (semver)
Affected: 5.15.7 , < 5.15.216 (semver)
Affected: 5.4.164 , < 5.5 (semver)
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Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "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."
        }
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:N - fib6_rule_suppress() runs on every IPv6 route lookup via fib6_rule_lookup(), including ip6_route_input() for received packets and icmp6/icmpv6 redirect handlers; WireGuard/VPN servers commonly deploy suppress_prefixlength rules (wg-quick), so remote IPv6 traffic to those hosts reaches the bug.\nAC:L - Once suppress_prefixlength IPv6 policy routing rules exist, any matching packet deterministically triggers fib6_rule_suppress() to release the route while leaving a stale res-\u003ert6 pointer; no race or uncontrollable memory layout is required.\nPR:N - Remote exploitation needs only the ability to send IPv6 packets through a host whose operator already configured suppress rules (e.g., wg-quick); CAP_NET_ADMIN is an admin deployment prerequisite, not attacker privilege on the target.\nUI:N - No victim action is required beyond normal delivery of attacker-generated IPv6 traffic (or ICMPv6 redirect) to a host performing policy-route lookup.\nS:U - The stale rt6_info/dst_entry UAF corrupts kernel heap memory within the same host security boundary; it is not a VM escape or cross-authority sandbox break.\nC:H - Returning a released rt6_info leaves a dangling dst_entry in ip6_dst_cache; subsequent reads through ip6_dst_idev(), dst metrics, or error paths are classic slab UAF with attacker-influencable heap reuse via sustained IPv6 traffic.\nI:H - Double-free/imbalanced rcuref put and post-free use of rt6_info fields give heap corruption primitives; UAF on dst/route cache objects is routinely leveraged for kernel write and control-flow hijack.\nA:H - Commit explicitly reports rcuref_put_slowpath() WARN from dst_release() on the freed route; UAF and refcount corruption can oops/panic the kernel, fully denying availability."
            }
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      "title": "net: ipv6: clear suppressed fib6 rule result",
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    "datePublished": "2026-08-21T16:31:54.683Z",
    "dateReserved": "2026-08-15T05:44:03.918Z",
    "dateUpdated": "2026-08-25T05:40:07.594Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-74581",
      "id": "msrc_CVE-2026-74581",
      "initial_release_date": "2026-08-23T01:03:26.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net: ipv6: clear suppressed fib6 rule result",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74581.json",
      "version": "2"
    },
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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 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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-27T14:23:23+00:00",
      "cve": "CVE-2026-74581",
      "id": "CVE-2026-74581",
      "initial_release_date": "2026-08-21T00:00:00+00:00",
      "product_status:fixed": "1142",
      "product_status:known_affected": "146",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: ipv6: use-after-free in fib6_rule_suppress due to stale res-\u003ert6 pointer",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74581.json",
      "version": "3"
    }
  }
}



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Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.