CVE-2026-23103 (GCVE-0-2026-23103)
Vulnerability from cvelistv5
Published
2026-02-04 16:08
Modified
2026-08-05 12:20
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: ipvlan: Make the addrs_lock be per port Make the addrs_lock be per port, not per ipvlan dev. Initial code seems to be written in the assumption, that any address change must occur under RTNL. But it is not so for the case of IPv6. So 1) Introduce per-port addrs_lock. 2) It was needed to fix places where it was forgotten to take lock (ipvlan_open/ipvlan_close) This appears to be a very minor problem though. Since it's highly unlikely that ipvlan_add_addr() will be called on 2 CPU simultaneously. But nevertheless, this could cause: 1) False-negative of ipvlan_addr_busy(): one interface iterated through all port->ipvlans + ipvlan->addrs under some ipvlan spinlock, and another added IP under its own lock. Though this is only possible for IPv6, since looks like only ipvlan_addr6_event() can be called without rtnl_lock. 2) Race since ipvlan_ht_addr_add(port) is called under different ipvlan->addrs_lock locks This should not affect performance, since add/remove IP is a rare situation and spinlock is not taken on fast paths.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8230819494b3bf284ca7262ac5f877333147b937
Version: 8230819494b3bf284ca7262ac5f877333147b937
Version: 8230819494b3bf284ca7262ac5f877333147b937
Version: 8230819494b3bf284ca7262ac5f877333147b937
Version: 8230819494b3bf284ca7262ac5f877333147b937
Version: 8230819494b3bf284ca7262ac5f877333147b937
Version: 8230819494b3bf284ca7262ac5f877333147b937
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port, not per ipvlan dev.\\n\\nInitial code seems to be written in the assumption,\\nthat any address change must occur under RTNL.\\nBut it is not so for the case of IPv6. So\\n\\n1) Introduce per-port addrs_lock.\\n\\n2) It was needed to fix places where it was forgotten\\nto take lock (ipvlan_open/ipvlan_close)\\n\\nThis appears to be a very minor problem though.\\nSince it\u0027s highly unlikely that ipvlan_add_addr() will\\nbe called on 2 CPU simultaneously. But nevertheless,\\nthis could cause:\\n\\n1) False-negative of ipvlan_addr_busy(): one interface\\niterated through all port-\u003eipvlans + ipvlan-\u003eaddrs\\nunder some ipvlan spinlock, and another added IP\\nunder its own lock. Though this is only possible\\nfor IPv6, since looks like only ipvlan_addr6_event() can be\\ncalled without rtnl_lock.\\n\\n2) Race since ipvlan_ht_addr_add(port) is called under\\ndifferent ipvlan-\u003eaddrs_lock locks\\n\\nThis should not affect performance, since add/remove IP\\nis a rare situation and spinlock is not taken on fast\\npaths.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.249\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.199\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.162\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.122\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.68\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.8\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"4.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T22:00:10.728Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-23103\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-14T12:46:03.041Z\", \"dateReserved\": \"2026-01-13T15:37:45.966Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-02-04T16:08:24.771Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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