CVE-2026-31680 (GCVE-0-2026-31680)
Vulnerability from cvelistv5
Published
2026-04-25 08:46
Modified
2026-10-19 18:56
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ipv6: flowlabel: defer exclusive option free until RCU teardown `ip6fl_seq_show()` walks the global flowlabel hash under the seq-file RCU read-side lock and prints `fl->opt->opt_nflen` when an option block is present. Exclusive flowlabels currently free `fl->opt` as soon as `fl->users` drops to zero in `fl_release()`. However, the surrounding `struct ip6_flowlabel` remains visible in the global hash table until later garbage collection removes it and `fl_free_rcu()` finally tears it down. A concurrent `/proc/net/ip6_flowlabel` reader can therefore race that early `kfree()` and dereference freed option state, triggering a crash in `ip6fl_seq_show()`. Fix this by keeping `fl->opt` alive until `fl_free_rcu()`. That matches the lifetime already required for the enclosing flowlabel while readers can still reach it under RCU.
References
Impacted products
Vendor Product Version
Linux Linux Version: d3aedd5ebd4b0b925b0bcda548066803e1318499
Version: d3aedd5ebd4b0b925b0bcda548066803e1318499
Version: d3aedd5ebd4b0b925b0bcda548066803e1318499
Version: d3aedd5ebd4b0b925b0bcda548066803e1318499
Version: d3aedd5ebd4b0b925b0bcda548066803e1318499
Version: d3aedd5ebd4b0b925b0bcda548066803e1318499
Version: d3aedd5ebd4b0b925b0bcda548066803e1318499
Version: d3aedd5ebd4b0b925b0bcda548066803e1318499
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It does not cross a VM, IOMMU, or separate authorization boundary.\\nC:H - The bug is a use-after-free of struct ipv6_txoptions reachable from procfs output, and freed kernel heap contents can be exposed or attacker-shaped. Per the required conservative guidance, kernel UAFs are scored High for confidentiality.\\nI:H - Although the observed dereference is a stale read, this is a kernel heap use-after-free in attacker-reclaimable memory. Per the required conservative guidance and upward scoring on uncertainty, UAFs are scored High for integrity.\\nA:H - A concurrent /proc/net/ip6_flowlabel reader can dereference freed option state in ip6fl_seq_show(), causing an oops or kernel crash. 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\"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"5.10.253\", \"lessThanOrEqual\": \"5.10.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"5.15.203\", \"lessThanOrEqual\": \"5.15.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"6.1.168\", \"lessThanOrEqual\": \"6.1.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"6.6.134\", \"lessThanOrEqual\": \"6.6.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"6.12.81\", \"lessThanOrEqual\": \"6.12.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"6.18.22\", \"lessThanOrEqual\": \"6.18.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"6.19.12\", \"lessThanOrEqual\": \"6.19.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"7.0\", \"lessThanOrEqual\": \"*\", \"status\": \"unaffected\", \"versionType\": 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{\"url\": \"https://git.kernel.org/stable/c/572ce62778519a7d4d1c15f55dd2e45a474133c4\"}, {\"url\": \"https://git.kernel.org/stable/c/9ca562bb8e66978b53028fa32b1a190708e6a091\"}], \"title\": \"net: ipv6: flowlabel: defer exclusive option free until RCU teardown\", \"x_generator\": {\"engine\": \"bippy-1.2.0\"}}, \"adp\": [{\"x_adpType\": \"supplier\", \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-10-15T01:17:47.566Z\"}, \"affected\": [{\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, 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      "cveMetadata": "{\"cveId\": \"CVE-2026-31680\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"Linux\", \"dateReserved\": \"2026-03-09T15:48:24.130Z\", \"datePublished\": \"2026-04-25T08:46:56.807Z\", \"dateUpdated\": \"2026-10-19T18:56:04.513Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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