335 lines
17 KiB
JSON
335 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-37757",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T04:51:23.938Z",
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"datePublished": "2025-05-01T12:56:01.195Z",
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"dateUpdated": "2026-10-15T21:51:59.433Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:57:20.227Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix memory leak in tipc_link_xmit\n\nIn case the backlog transmit queue for system-importance messages is overloaded,\ntipc_link_xmit() returns -ENOBUFS but the skb list is not purged. This leads to\nmemory leak and failure when a skb is allocated.\n\nThis commit fixes this issue by purging the skb list before tipc_link_xmit()\nreturns."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The leak is driven through the TIPC link transmit path, reachable from a remote peer node over the routable UDP bearer (port 6118) or an Ethernet bearer, since incoming messages to unknown ports generate SYSTEM-importance reject messages via tipc_sk_rcv()/tipc_msg_reverse() that flow into tipc_link_xmit(). TIPC packet processing is network-facing net/ stack code, so AV:N applies.\nAC:L - The attacker controls both sides of the condition: it generates the SYSTEM-importance messages (flooding closed ports, or publishing names) and, as the link peer, controls the drain rate by withholding link acknowledgements, so overflowing backlog[TIPC_SYSTEM_IMPORTANCE] (limit ~873 packets at 1500 MTU) is reliably reproducible.\nPR:N - TIPC performs no peer authentication by default — neighbour discovery auto-admits unknown nodes (tipc_udp_rcast_add) and TIPC_CRYPTO requires out-of-band key configuration — so an unauthenticated node reaching the bearer can trigger this. Even on the purely local path, net/tipc has no capable() checks outside netlink_compat.c, so any unprivileged user suffices.\nUI:N - Triggering only requires sending TIPC traffic or performing socket operations; no action by any local user or administrator is needed.\nS:U - The leaked memory and the resulting exhaustion are confined to the kernel of the affected host, with no crossing of a VM, IOMMU, or other security authority boundary.\nC:N - The bug orphans skbs that are never read or exposed; there is no out-of-bounds read, uninitialized-memory disclosure, or use-after-free that could yield attacker-visible data.\nI:N - No memory is corrupted or overwritten — the skbs are simply never freed — so no kernel or user data is modified by the flaw.\nA:H - The leak is unbounded and attacker-paced: full-MTU skbs are leaked permanently at flood rate, exhausting kernel memory and causing system-wide allocation failures and OOM, and each overflow additionally forces tipc_node_link_down(), resetting the link and denying TIPC cluster connectivity."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/tipc/link.c"
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],
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"net/tipc/link.c"
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],
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"version": "0",
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"status": "unaffected",
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},
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{
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"version": "6.14.3",
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"status": "unaffected",
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},
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{
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"version": "6.15",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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],
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"title": "tipc: fix memory leak in tipc_link_xmit",
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"id": "CVE-2025-37757",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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