CVE-2025-38006 (GCVE-0-2025-38006)

Vulnerability from cvelistv5 – Published: 2025-06-18 09:28 – Updated: 2026-05-11 21:19
VLAI
Title
net: mctp: Don't access ifa_index when missing
Summary
In the Linux kernel, the following vulnerability has been resolved: net: mctp: Don't access ifa_index when missing In mctp_dump_addrinfo, ifa_index can be used to filter interfaces, but only when the struct ifaddrmsg is provided. Otherwise it will be comparing to uninitialised memory - reproducible in the syzkaller case from dhcpd, or busybox "ip addr show". The kernel MCTP implementation has always filtered by ifa_index, so existing userspace programs expecting to dump MCTP addresses must already be passing a valid ifa_index value (either 0 or a real index). BUG: KMSAN: uninit-value in mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128 mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128 rtnl_dump_all+0x3ec/0x5b0 net/core/rtnetlink.c:4380 rtnl_dumpit+0xd5/0x2f0 net/core/rtnetlink.c:6824 netlink_dump+0x97b/0x1690 net/netlink/af_netlink.c:2309
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 583be982d93479ea3d85091b0fd0b01201ede87d , < 8ef7b3f0db69e2f4a80be351f6aee9a4c2332ef9 (git)
Affected: 583be982d93479ea3d85091b0fd0b01201ede87d , < acab78ae12c7fefb4f3bfe22e00770a5faa42724 (git)
Affected: 583be982d93479ea3d85091b0fd0b01201ede87d , < d4d1561d17eb72908e4489c0900d96e0484fac20 (git)
Affected: 583be982d93479ea3d85091b0fd0b01201ede87d , < 24fa213dffa470166ec014f979f36c6ff44afb45 (git)
Affected: 583be982d93479ea3d85091b0fd0b01201ede87d , < f11cf946c0a92c560a890d68e4775723353599e1 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.6.92 , ≤ 6.6.* (semver)
Unaffected: 6.12.30 , ≤ 6.12.* (semver)
Unaffected: 6.14.8 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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{
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    "dateReserved": "2025-04-16T04:51:23.977Z",
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Otherwise it will be\\ncomparing to uninitialised memory - reproducible in the syzkaller case from\\ndhcpd, or busybox \\\"ip addr show\\\".\\n\\nThe kernel MCTP implementation has always filtered by ifa_index, so\\nexisting userspace programs expecting to dump MCTP addresses must\\nalready be passing a valid ifa_index value (either 0 or a real index).\\n\\nBUG: KMSAN: uninit-value in mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128\\n mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128\\n rtnl_dump_all+0x3ec/0x5b0 net/core/rtnetlink.c:4380\\n rtnl_dumpit+0xd5/0x2f0 net/core/rtnetlink.c:6824\\n netlink_dump+0x97b/0x1690 net/netlink/af_netlink.c:2309\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: mctp: No acceder a ifa_index si falta. En mctp_dump_addrinfo, ifa_index puede usarse para filtrar interfaces, pero solo cuando se proporciona la estructura ifaddrmsg. De lo contrario, se comparar\u00e1 con memoria no inicializada, lo cual es reproducible en el caso de syzkaller desde dhcpd o \\\"ip addr show\\\" de busybox. La implementaci\u00f3n de MCTP del kernel siempre ha filtrado por ifa_index, por lo que los programas de espacio de usuario que esperan volcar direcciones MCTP ya deben estar pasando un valor v\u00e1lido de ifa_index (0 o un \u00edndice real). ERROR: KMSAN: valor no inicializado en mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128 mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128 rtnl_dump_all+0x3ec/0x5b0 net/core/rtnetlink.c:4380 rtnl_dumpit+0xd5/0x2f0 net/core/rtnetlink.c:6824 netlink_dump+0x97b/0x1690 net/netlink/af_netlink.c:2309\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-908\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15\",\"versionEndExcluding\":\"6.6.92\",\"matchCriteriaId\":\"1331981E-FB4D-4961-8B53-1E10B4AACFBF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.30\",\"matchCriteriaId\":\"8F43EF2E-9448-4BCA-99D9-DAEAEB7523C5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.14.8\",\"matchCriteriaId\":\"D4458049-AD51-4F1B-BAB9-C32B53A54DE1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"8D465631-2980-487A-8E65-40AE2B9F8ED1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4C9D071F-B28E-46EC-AC61-22B913390211\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"13FC0DDE-E513-465E-9E81-515702D49B74\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"8C7B5B0E-4EEB-48F5-B4CF-0935A7633845\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.15:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"2D240580-3048-49B2-9E27-F115A9DF8224\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.15:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"90320558-E553-4EF5-8A0B-0F5D20113BD2\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/24fa213dffa470166ec014f979f36c6ff44afb45\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8ef7b3f0db69e2f4a80be351f6aee9a4c2332ef9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/acab78ae12c7fefb4f3bfe22e00770a5faa42724\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d4d1561d17eb72908e4489c0900d96e0484fac20\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f11cf946c0a92c560a890d68e4775723353599e1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
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}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.



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