CVE-2025-37757 (GCVE-0-2025-37757)

Vulnerability from cvelistv5 – Published: 2025-05-01 12:56 – Updated: 2026-08-05 11:57
VLAI
Title
tipc: fix memory leak in tipc_link_xmit
Summary
In the Linux kernel, the following vulnerability has been resolved: tipc: fix memory leak in tipc_link_xmit In case the backlog transmit queue for system-importance messages is overloaded, tipc_link_xmit() returns -ENOBUFS but the skb list is not purged. This leads to memory leak and failure when a skb is allocated. This commit fixes this issue by purging the skb list before tipc_link_xmit() returns.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 365ad353c2564bba8835290061308ba825166b3a , < 84895f5ce3829d9fc030e5ec2d8729da4c0c9d08 (git)
Affected: 365ad353c2564bba8835290061308ba825166b3a , < d4d40e437adb376be16b3a12dd5c63f0fa768247 (git)
Affected: 365ad353c2564bba8835290061308ba825166b3a , < ed06675d3b8cd37120b447646d53f7cd3e6fcd63 (git)
Affected: 365ad353c2564bba8835290061308ba825166b3a , < 24e6280cdd7f8d01fc6b9b365fb800c2fb7ea9bb (git)
Affected: 365ad353c2564bba8835290061308ba825166b3a , < 09c2dcda2c551bba30710c33f6ac678ae7395389 (git)
Affected: 365ad353c2564bba8835290061308ba825166b3a , < 7c5957f7905b4aede9d7a559d271438f3ca9e852 (git)
Affected: 365ad353c2564bba8835290061308ba825166b3a , < d0e02d3d27a0b4dcb13f954f537ca1dd8f282dcf (git)
Affected: 365ad353c2564bba8835290061308ba825166b3a , < a40cbfbb8f95c325430f017883da669b2aa927d4 (git)
Affected: 365ad353c2564bba8835290061308ba825166b3a , < 69ae94725f4fc9e75219d2d69022029c5b24bc9a (git)
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Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 5.4.293 , ≤ 5.4.* (semver)
Unaffected: 5.10.237 , ≤ 5.10.* (semver)
Unaffected: 5.15.181 , ≤ 5.15.* (semver)
Unaffected: 6.1.135 , ≤ 6.1.* (semver)
Unaffected: 6.6.88 , ≤ 6.6.* (semver)
Unaffected: 6.12.24 , ≤ 6.12.* (semver)
Unaffected: 6.13.12 , ≤ 6.13.* (semver)
Unaffected: 6.14.3 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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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 \u2014 neighbour discovery auto-admits unknown nodes (tipc_udp_rcast_add) and TIPC_CRYPTO requires out-of-band key configuration \u2014 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 \u2014 the skbs are simply never freed \u2014 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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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-37757\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-01T13:15:54.480\",\"lastModified\":\"2026-07-30T06:22:19.400\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tipc: se corrige una fuga de memoria en tipc_link_xmit. Si la cola de transmisi\u00f3n de mensajes importantes del sistema est\u00e1 sobrecargada, tipc_link_xmit() devuelve -ENOBUFS, pero la lista de skb no se purga. Esto provoca una fuga de memoria y un fallo al asignar un skb. Esta confirmaci\u00f3n corrige este problema purgando la lista de skb antes del retorno de tipc_link_xmit().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/tipc/link.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"365ad353c2564bba8835290061308ba825166b3a\",\"lessThan\":\"84895f5ce3829d9fc030e5ec2d8729da4c0c9d08\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"365ad353c2564bba8835290061308ba825166b3a\",\"lessThan\":\"d4d40e437adb376be16b3a12dd5c63f0fa768247\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"365ad353c2564bba8835290061308ba825166b3a\",\"lessThan\":\"ed06675d3b8cd37120b447646d53f7cd3e6fcd63\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"365ad353c2564bba8835290061308ba825166b3a\",\"lessThan\":\"24e6280cdd7f8d01fc6b9b365fb800c2fb7ea9bb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"365ad353c2564bba8835290061308ba825166b3a\",\"lessThan\":\"09c2dcda2c551bba30710c33f6ac678ae7395389\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"365ad353c2564bba8835290061308ba825166b3a\",\"lessThan\":\"7c5957f7905b4aede9d7a559d271438f3ca9e852\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"365ad353c2564bba8835290061308ba825166b3a\",\"lessThan\":\"d0e02d3d27a0b4dcb13f954f537ca1dd8f282dcf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"365ad353c2564bba8835290061308ba825166b3a\",\"lessThan\":\"a40cbfbb8f95c325430f017883da669b2aa927d4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"365ad353c2564bba8835290061308ba825166b3a\",\"lessThan\":\"69ae94725f4fc9e75219d2d69022029c5b24bc9a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/tipc/link.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.293\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.237\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.181\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.135\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.88\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.24\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.13.12\",\"lessThanOrEqual\":\"6.13.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.14.3\",\"lessThanOrEqual\":\"6.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6},{\"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-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.11\",\"versionEndExcluding\":\"5.4.293\",\"matchCriteriaId\":\"9DF2A23C-4338-44D6-8D5D-4086EC006A48\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.237\",\"matchCriteriaId\":\"0710B81E-E2FA-4E15-8F68-D297EBB4D50D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.181\",\"matchCriteriaId\":\"12331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List\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T09:36:23+00:00",
      "cve": "CVE-2025-37757",
      "id": "CVE-2025-37757",
      "initial_release_date": "2025-05-01T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tipc: fix memory leak in tipc_link_xmit",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-37757.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T01:59:47Z",
      "cve": "CVE-2025-37757",
      "id": "CVE-2025-37757",
      "initial_release_date": "2025-05-02T02:02:54Z",
      "product_status:known_affected": "746",
      "product_status:known_not_affected": "36",
      "product_status:recommended": "419",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-37757",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-37757.json",
      "version": "50"
    }
  }
}



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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

Author Source Type Date Other

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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.