CVE-2025-21766 (GCVE-0-2025-21766)
Vulnerability from cvelistv5
Published
2025-02-27 02:18
Modified
2026-10-15 21:51
Severity ?
8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv4: use RCU protection in __ip_rt_update_pmtu() __ip_rt_update_pmtu() must use RCU protection to make sure the net structure it reads does not disappear.
References
Impacted products
Vendor Product Version
Linux Linux Version: 2fbc6e89b2f1403189e624cabaf73e189c5e50c6
Version: 2fbc6e89b2f1403189e624cabaf73e189c5e50c6
Version: 2fbc6e89b2f1403189e624cabaf73e189c5e50c6
Version: 2fbc6e89b2f1403189e624cabaf73e189c5e50c6
Version: 2fbc6e89b2f1403189e624cabaf73e189c5e50c6
Version: 2fbc6e89b2f1403189e624cabaf73e189c5e50c6
Version: f415c264176e6095e9dee823e09c5bdd0ee0d337
Version: 98776a365da509ad923083ae54b38ee521c52742
Version: 860e2cc78c697c95bc749abb20047239fa1722ea
Version: 2b1be6c925cdf4638811765a9160796291494b89
Version: 4.14.200   ≤
Version: 4.19.148   ≤
Version: 5.4.68   ≤
Version: 5.8.12   ≤
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opens, mounts, configures, or clicks anything for the vulnerable dereference to run.\\nS:U - The use-after-free read and the resulting bogus FIB lookup and FNHE writes are all confined to the kernel\u0027s own security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\\nC:H - The freed `struct net` is not merely read for two sysctls \\u2014 it is fed to `fib_lookup()`, which loads `net-\u003eipv4.fib_main`/`fib_default`/`rules_ops` out of reclaimed memory and walks them as FIB tables and rule lists, so a groomed reallocation of the `net_cachep` object turns this into an attacker-directed read of arbitrary kernel addresses.\\nI:H - `update_or_create_fnhe()` writes through the `fib_nh_common` returned by that poisoned lookup \\u2014 `rcu_assign_pointer(nhc-\u003enhc_exceptions, hash)`, `fnhe-\u003efnhe_pmtu = pmtu`, `fnhe-\u003efnhe_expires` \\u2014 with `pmtu` taken verbatim from the attacker\u0027s `ntohs(icmph-\u003eun.frag.mtu)`, yielding a controlled write through a pointer chain rooted in freed memory.\\nA:H - Even without weaponization, walking a FIB trie and a fib_rules list off a freed `struct net` reliably faults or corrupts state, producing a KASAN splat, oops, or panic, and the attacker can retrigger it indefinitely by replaying ICMP frag-needed packets.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2fbc6e89b2f1403189e624cabaf73e189c5e50c6\", \"lessThan\": \"ce3c6165fce0f06305c806696882a3ad4b90e33f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2fbc6e89b2f1403189e624cabaf73e189c5e50c6\", \"lessThan\": \"ea07480b23225942208f1b754fea1e7ec486d37e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2fbc6e89b2f1403189e624cabaf73e189c5e50c6\", \"lessThan\": \"9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2fbc6e89b2f1403189e624cabaf73e189c5e50c6\", \"lessThan\": \"4583748b65dee4d61bd50a2214715b4237bc152a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2fbc6e89b2f1403189e624cabaf73e189c5e50c6\", \"lessThan\": \"a39f61d212d822b3062d7f70fa0588e50e55664e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2fbc6e89b2f1403189e624cabaf73e189c5e50c6\", \"lessThan\": \"139512191bd06f1b496117c76372b2ce372c9a41\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f415c264176e6095e9dee823e09c5bdd0ee0d337\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"98776a365da509ad923083ae54b38ee521c52742\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"860e2cc78c697c95bc749abb20047239fa1722ea\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2b1be6c925cdf4638811765a9160796291494b89\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4.14.200\", \"lessThan\": \"4.15\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.19.148\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.4.68\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.8.12\", \"lessThan\": \"5.9\", \"versionType\": \"semver\"}], \"programFiles\": [\"net/ipv4/route.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.9\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.9\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.179\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.129\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.79\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.16\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv4/route.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/ce3c6165fce0f06305c806696882a3ad4b90e33f\"}, {\"url\": \"https://git.kernel.org/stable/c/ea07480b23225942208f1b754fea1e7ec486d37e\"}, {\"url\": \"https://git.kernel.org/stable/c/9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4\"}, {\"url\": \"https://git.kernel.org/stable/c/4583748b65dee4d61bd50a2214715b4237bc152a\"}, {\"url\": \"https://git.kernel.org/stable/c/a39f61d212d822b3062d7f70fa0588e50e55664e\"}, {\"url\": \"https://git.kernel.org/stable/c/139512191bd06f1b496117c76372b2ce372c9a41\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nipv4: use RCU protection in __ip_rt_update_pmtu()\\n\\n__ip_rt_update_pmtu() must use RCU protection to make\\nsure the net structure it reads does not disappear.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.179\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.129\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.79\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.16\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.4\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.200\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.148\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.68\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.8.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:54:19.559Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21766\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-15T21:51:52.707Z\", \"dateReserved\": \"2024-12-29T08:45:45.762Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-27T02:18:16.570Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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