Vulnerability-Lookup

FKIE_CVE-2025-38514

Vulnerability from fkie_nvd - Published: 2025-08-16 11:15 - Updated: 2026-07-30 06:23

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix oops due to non-existence of prealloc backlog struct If an AF_RXRPC service socket is opened and bound, but calls are preallocated, then rxrpc_alloc_incoming_call() will oops because the rxrpc_backlog struct doesn't get allocated until the first preallocation is made. Fix this by returning NULL from rxrpc_alloc_incoming_call() if there is no backlog struct. This will cause the incoming call to be aborted.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0eef29385d715d4c7fd707b18d4a9b76c76dd5e6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2c2e9ebeb036f9b1b09325ec5cfdfe0e78f357c3	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/880a88f318cf1d2a0f4c0a7ff7b07e2062b434a4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bf0ca6a1bc4fb904b598137c6718785a107e3adf	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d1ff5f9d2c5405681457262e23c720b08977c11f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/efc1b2b7c1a308b60df8f36bc2d7ce16d3999364	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f5e72b7824d08c206ce106d30cb37c4642900ccc	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f7afb3ff01c42c49e8a143cdce400b95844bb506	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	Third Party Advisory

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.16
linux	linux_kernel	6.16
linux	linux_kernel	6.16
linux	linux_kernel	6.16
linux	linux_kernel	6.16
debian	debian_linux	11.0

JSON

To clipboard

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix oops due to non-existence of prealloc backlog struct\n\nIf an AF_RXRPC service socket is opened and bound, but calls are\npreallocated, then rxrpc_alloc_incoming_call() will oops because the\nrxrpc_backlog struct doesn\u0027t get allocated until the first preallocation is\nmade.\n\nFix this by returning NULL from rxrpc_alloc_incoming_call() if there is no\nbacklog struct.  This will cause the incoming call to be aborted."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rxrpc: Se corrige un error debido a la inexistencia de la estructura de registro de preasignaci\u00f3n. Si se abre y enlaza un socket de servicio AF_RXRPC, pero las llamadas est\u00e1n preasignadas, rxrpc_alloc_incoming_call() generar\u00e1 un error porque la estructura rxrpc_backlog no se asigna hasta que se realiza la primera preasignaci\u00f3n. Se soluciona este problema devolviendo NULL desde rxrpc_alloc_incoming_call() si no existe la estructura de registro de preasignaci\u00f3n. Esto provocar\u00e1 la interrupci\u00f3n de la llamada entrante."
    }
  ],
  "id": "CVE-2025-38514",
  "lastModified": "2026-07-30T06:23:23.557",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
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        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
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      {
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  "published": "2025-08-16T11:15:44.510",
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      "tags": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
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      ],
      "source": "nvd@nist.gov",
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  ]
}

CVE-2025-38514 (GCVE-0-2025-38514)

Vulnerability from cvelistv5 – Published: 2025-08-16 10:55 – Updated: 2026-08-05 12:02

Title

rxrpc: Fix oops due to non-existence of prealloc backlog struct

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Assigner

Linux mitre root

References

10 references

URL	Tags
https://git.kernel.org/stable/c/bf0ca6a1bc4fb904b…
https://git.kernel.org/stable/c/f7afb3ff01c42c49e…
https://git.kernel.org/stable/c/f5e72b7824d08c206…
https://git.kernel.org/stable/c/0eef29385d715d4c7…
https://git.kernel.org/stable/c/efc1b2b7c1a308b60…
https://git.kernel.org/stable/c/d1ff5f9d2c5405681…
https://git.kernel.org/stable/c/2c2e9ebeb036f9b1b…
https://git.kernel.org/stable/c/880a88f318cf1d2a0…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < bf0ca6a1bc4fb904b598137c6718785a107e3adf (git) Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < f7afb3ff01c42c49e8a143cdce400b95844bb506 (git) Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < f5e72b7824d08c206ce106d30cb37c4642900ccc (git) Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < 0eef29385d715d4c7fd707b18d4a9b76c76dd5e6 (git) Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < efc1b2b7c1a308b60df8f36bc2d7ce16d3999364 (git) Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < d1ff5f9d2c5405681457262e23c720b08977c11f (git) Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < 2c2e9ebeb036f9b1b09325ec5cfdfe0e78f357c3 (git) Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < 880a88f318cf1d2a0f4c0a7ff7b07e2062b434a4 (git)
Linux	Linux	Affected: 4.9 Unaffected: 0 , < 4.9 (semver) Unaffected: 5.4.296 , ≤ 5.4.* (semver) Unaffected: 5.10.240 , ≤ 5.10.* (semver) Unaffected: 5.15.189 , ≤ 5.15.* (semver) Unaffected: 6.1.146 , ≤ 6.1.* (semver) Unaffected: 6.6.99 , ≤ 6.6.* (semver) Unaffected: 6.12.39 , ≤ 6.12.* (semver) Unaffected: 6.15.7 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T17:39:18.150Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
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          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
          }
        ],
        "title": "CVE Program Container"
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    "cna": {
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          "programFiles": [
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              "version": "248f219cb8bcbfbd7f132752d44afa2df7c241d1",
              "versionType": "git"
            },
            {
              "lessThan": "2c2e9ebeb036f9b1b09325ec5cfdfe0e78f357c3",
              "status": "affected",
              "version": "248f219cb8bcbfbd7f132752d44afa2df7c241d1",
              "versionType": "git"
            },
            {
              "lessThan": "880a88f318cf1d2a0f4c0a7ff7b07e2062b434a4",
              "status": "affected",
              "version": "248f219cb8bcbfbd7f132752d44afa2df7c241d1",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/rxrpc/call_accept.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.9"
            },
            {
              "lessThan": "4.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.296",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.240",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.146",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.99",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.296",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.240",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.189",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.146",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.99",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.39",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.7",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix oops due to non-existence of prealloc backlog struct\n\nIf an AF_RXRPC service socket is opened and bound, but calls are\npreallocated, then rxrpc_alloc_incoming_call() will oops because the\nrxrpc_backlog struct doesn\u0027t get allocated until the first preallocation is\nmade.\n\nFix this by returning NULL from rxrpc_alloc_incoming_call() if there is no\nbacklog struct.  This will cause the incoming call to be aborted."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The oops is driven entirely by a received UDP/rxrpc datagram processed in the endpoint\u0027s I/O thread (`rxrpc_encap_rcv` \u2192 `rxrpc_input_packet` \u2192 `rxrpc_new_incoming_call`), and AF_RXRPC services live on routable UDP ports such as the well-known AFS callback port 7001. Any remote host able to send a packet to that port reaches the vulnerable function.\nAC:L - A single well-formed rxrpc DATA packet (seq!=0, callNumber!=0, matching serviceId, securityIndex 0) deterministically dereferences the NULL backlog pointer \u2014 no race, memory-layout, or timing dependency in the packet path itself, and the well-known service IDs are protocol constants. The attacker can simply keep the port fed so any bind\u2192listen window (as in `afs_open_socket`) is hit, and sockets bound without listening are persistently exposed.\nPR:N - The attacker is an unauthenticated remote peer holding no credentials on the victim: `rxrpc_get_incoming_security()` accepts `RXRPC_SECURITY_NONE` with no key at all, and even for secured services the CHALLENGE is only queued after `rxrpc_alloc_incoming_call()` has already crashed. The same crash is also reachable by a plain unprivileged local user, since `rxrpc_create()`/`rxrpc_bind()` require no capability.\nUI:N - The crash happens autonomously inside the rxrpc I/O kernel thread while processing an inbound packet against an already-bound service socket. No victim action, mount, or file access is part of the attack.\nS:U - The NULL dereference and its consequences are confined to the kernel of the host running the AF_RXRPC service socket, with no crossing into a hypervisor, IOMMU, or sandbox authority.\nC:N - The faulting access is a read of `b-\u003ecall_backlog_head` at offset 4 from NULL, which is below `mmap_min_addr` and faults immediately. No kernel memory contents are returned to the attacker or leaked to userspace.\nI:N - Execution aborts on the very first load in `rxrpc_alloc_incoming_call()`, before any of the subsequent stores (`peer-\u003esrx = *peer_srx`, `conn-\u003elocal = ...`) are reached. Nothing is written or corrupted, so no overwrite or control-flow hijack primitive exists.\nA:H - The dereference oopses the rxrpc I/O kthread while it holds `read_lock_irq(\u0026local-\u003eservices_lock)` and `spin_lock(\u0026rx-\u003eincoming_lock)`, so the thread dies with IRQs disabled and both locks permanently held \u2014 all rxrpc/AFS traffic on that endpoint stops and any later bind or socket release spins forever. Under the common `panic_on_oops=1` configuration it is an immediate full system panic, repeatable with one packet."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:02:34.827Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bf0ca6a1bc4fb904b598137c6718785a107e3adf"
        },
        {
          "url": "https://git.kernel.org/stable/c/f7afb3ff01c42c49e8a143cdce400b95844bb506"
        },
        {
          "url": "https://git.kernel.org/stable/c/f5e72b7824d08c206ce106d30cb37c4642900ccc"
        },
        {
          "url": "https://git.kernel.org/stable/c/0eef29385d715d4c7fd707b18d4a9b76c76dd5e6"
        },
        {
          "url": "https://git.kernel.org/stable/c/efc1b2b7c1a308b60df8f36bc2d7ce16d3999364"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1ff5f9d2c5405681457262e23c720b08977c11f"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c2e9ebeb036f9b1b09325ec5cfdfe0e78f357c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/880a88f318cf1d2a0f4c0a7ff7b07e2062b434a4"
        }
      ],
      "title": "rxrpc: Fix oops due to non-existence of prealloc backlog struct",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38514",
    "datePublished": "2025-08-16T10:55:01.150Z",
    "dateReserved": "2025-04-16T04:51:24.023Z",
    "dateUpdated": "2026-08-05T12:02:34.827Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.