CVE-2026-74581 (GCVE-0-2026-74581)
Vulnerability from cvelistv5
Published
2026-08-21 16:31
Modified
2026-10-16 19:05
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 209d35ee34e25f9668c404350a1c86d914c54ffa
Version: 8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383
Version: cdef485217d30382f3bf6448c54b4401648fe3f1
Version: cdef485217d30382f3bf6448c54b4401648fe3f1
Version: cdef485217d30382f3bf6448c54b4401648fe3f1
Version: cdef485217d30382f3bf6448c54b4401648fe3f1
Version: cdef485217d30382f3bf6448c54b4401648fe3f1
Version: cdef485217d30382f3bf6448c54b4401648fe3f1
Version: ee38eb8cf9a7323884c2b8e0adbbeb2192d31e29
Version: 5.10.84   ≤
Version: 5.15.7   ≤
Version: 5.4.164   ≤
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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"209d35ee34e25f9668c404350a1c86d914c54ffa\", \"lessThan\": \"90c57310e266eb94e4a80d6b15a9ca131d2e82cb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383\", \"lessThan\": \"5d29b286c9de0b309e94b9ed083aa1a2f429434f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cdef485217d30382f3bf6448c54b4401648fe3f1\", \"lessThan\": \"354db6243eca59e9d187ffbf8b7955b044ce84dc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cdef485217d30382f3bf6448c54b4401648fe3f1\", \"lessThan\": \"6d98c70fe0ba8c7708bfd5b2a5174d2086775daa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cdef485217d30382f3bf6448c54b4401648fe3f1\", \"lessThan\": \"9bad152c42b37499162367fe47867411e62fffa3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cdef485217d30382f3bf6448c54b4401648fe3f1\", \"lessThan\": \"dc3ab04220667f254f4348572b2a0b3febff89fb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cdef485217d30382f3bf6448c54b4401648fe3f1\", \"lessThan\": \"a341c091ca0bfae377747b1b59a3bd8ebe18a937\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cdef485217d30382f3bf6448c54b4401648fe3f1\", \"lessThan\": \"6aea62e433fe1b586202a5fee8b5807ce635e1d7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ee38eb8cf9a7323884c2b8e0adbbeb2192d31e29\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.10.84\", \"lessThan\": \"5.10.265\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.15.7\", \"lessThan\": \"5.15.216\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.4.164\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}], \"programFiles\": [\"net/ipv6/fib6_rules.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.16\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.16\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.265\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.216\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.183\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.151\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.103\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.44\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv6/fib6_rules.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/90c57310e266eb94e4a80d6b15a9ca131d2e82cb\"}, {\"url\": \"https://git.kernel.org/stable/c/5d29b286c9de0b309e94b9ed083aa1a2f429434f\"}, {\"url\": \"https://git.kernel.org/stable/c/354db6243eca59e9d187ffbf8b7955b044ce84dc\"}, {\"url\": \"https://git.kernel.org/stable/c/6d98c70fe0ba8c7708bfd5b2a5174d2086775daa\"}, {\"url\": \"https://git.kernel.org/stable/c/9bad152c42b37499162367fe47867411e62fffa3\"}, {\"url\": \"https://git.kernel.org/stable/c/dc3ab04220667f254f4348572b2a0b3febff89fb\"}, {\"url\": \"https://git.kernel.org/stable/c/a341c091ca0bfae377747b1b59a3bd8ebe18a937\"}, {\"url\": \"https://git.kernel.org/stable/c/6aea62e433fe1b586202a5fee8b5807ce635e1d7\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"5.10.84\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"5.15.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.151\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.103\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.44\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.8\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.164\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-25T05:40:07.594Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74581\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T19:05:58.061Z\", \"dateReserved\": \"2026-08-15T05:44:03.918Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-21T16:31:54.683Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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