Vulnerability-Lookup

FKIE_CVE-2026-23419

Vulnerability from fkie_nvd - Published: 2026-04-03 14:16 - Updated: 2026-07-24 21:10

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: net/rds: Fix circular locking dependency in rds_tcp_tune syzbot reported a circular locking dependency in rds_tcp_tune() where sk_net_refcnt_upgrade() is called while holding the socket lock: ====================================================== WARNING: possible circular locking dependency detected ====================================================== kworker/u10:8/15040 is trying to acquire lock: ffffffff8e9aaf80 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_cache_noprof+0x4b/0x6f0 but task is already holding lock: ffff88805a3c1ce0 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: rds_tcp_tune+0xd7/0x930 The issue occurs because sk_net_refcnt_upgrade() performs memory allocation (via get_net_track() -> ref_tracker_alloc()) while the socket lock is held, creating a circular dependency with fs_reclaim. Fix this by moving sk_net_refcnt_upgrade() outside the socket lock critical section. This is safe because the fields modified by the sk_net_refcnt_upgrade() call (sk_net_refcnt, ns_tracker) are not accessed by any concurrent code path at this point. v2: - Corrected fixes tag - check patch line wrap nits - ai commentary nits

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/026bbaeeab9e04534ee58882b6447300629b42f6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6a877ececd6daa002a9a0002cd0fbca6592a9244	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6ce948fa54599f369ff7fe8b793a6aae4b0762b2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8519e6883a942e510f33a0e634e27bcc3a844a40	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8babb271403378ba6836f6c8599c5313d0e2355d	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	5.18
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

{
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          "product": "Linux",
          "programFiles": [
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: Fix circular locking dependency in rds_tcp_tune\n\nsyzbot reported a circular locking dependency in rds_tcp_tune() where\nsk_net_refcnt_upgrade() is called while holding the socket lock:\n\n======================================================\nWARNING: possible circular locking dependency detected\n======================================================\nkworker/u10:8/15040 is trying to acquire lock:\nffffffff8e9aaf80 (fs_reclaim){+.+.}-{0:0},\nat: __kmalloc_cache_noprof+0x4b/0x6f0\n\nbut task is already holding lock:\nffff88805a3c1ce0 (k-sk_lock-AF_INET6){+.+.}-{0:0},\nat: rds_tcp_tune+0xd7/0x930\n\nThe issue occurs because sk_net_refcnt_upgrade() performs memory\nallocation (via get_net_track() -\u003e ref_tracker_alloc()) while the\nsocket lock is held, creating a circular dependency with fs_reclaim.\n\nFix this by moving sk_net_refcnt_upgrade() outside the socket lock\ncritical section. This is safe because the fields modified by the\nsk_net_refcnt_upgrade() call (sk_net_refcnt, ns_tracker) are not\naccessed by any concurrent code path at this point.\n\nv2:\n  - Corrected fixes tag\n  - check patch line wrap nits\n  - ai commentary nits"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/rds: Correcci\u00f3n de la dependencia de bloqueo circular en rds_tcp_tune\n\nsyzbot inform\u00f3 de una dependencia de bloqueo circular en rds_tcp_tune() donde se llama a sk_net_refcnt_upgrade() mientras se mantiene el bloqueo del socket:\n\n======================================================\nADVERTENCIA: posible dependencia de bloqueo circular detectada\n======================================================\nkworker/u10:8/15040 est\u00e1 intentando adquirir el bloqueo:\nffffffff8e9aaf80 (fs_reclaim){+.+.}-{0:0},\nen: __kmalloc_cache_noprof+0x4b/0x6f0\n\npero la tarea ya est\u00e1 manteniendo el bloqueo:\nffff88805a3c1ce0 (k-sk_lock-AF_INET6){+.+.}-{0:0},\nen: rds_tcp_tune+0xd7/0x930\n\nEl problema ocurre porque sk_net_refcnt_upgrade() realiza una asignaci\u00f3n de memoria (a trav\u00e9s de get_net_track()  -\u003e  ref_tracker_alloc()) mientras se mantiene el bloqueo del socket, creando una dependencia circular con fs_reclaim.\n\nSolucione esto moviendo sk_net_refcnt_upgrade() fuera de la secci\u00f3n cr\u00edtica del bloqueo del socket. Esto es seguro porque los campos modificados por la llamada a sk_net_refcnt_upgrade() (sk_net_refcnt, ns_tracker) no son accedidos por ninguna ruta de c\u00f3digo concurrente en este punto.\n\nv2:\n  - Etiqueta de correcciones corregida\n  - revisar peque\u00f1os errores de ajuste de l\u00ednea del parche\n  - peque\u00f1os errores en los comentarios de ai"
    }
  ],
  "id": "CVE-2026-23419",
  "lastModified": "2026-07-24T21:10:00.143",
  "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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        "exploitabilityScore": 3.9,
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        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
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          "attackComplexity": "LOW",
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          "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",
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        "source": "nvd@nist.gov",
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  "published": "2026-04-03T14:16:27.843",
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  "vulnStatus": "Modified",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-667"
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      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}

CVE-2026-23419 (GCVE-0-2026-23419)

Vulnerability from cvelistv5 – Published: 2026-04-03 13:24 – Updated: 2026-08-05 12:21

Title

net/rds: Fix circular locking dependency in rds_tcp_tune

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 CNA under the mitre root

CNA scorecard D 53/100 over 6992 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/8babb271403378ba6…
https://git.kernel.org/stable/c/8519e6883a942e510…
https://git.kernel.org/stable/c/6ce948fa54599f369…
https://git.kernel.org/stable/c/026bbaeeab9e04534…
https://git.kernel.org/stable/c/6a877ececd6daa002…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3a58f13a881ed351198ffab4cf9953cf19d2ab3a , < 8babb271403378ba6836f6c8599c5313d0e2355d (git) Affected: 3a58f13a881ed351198ffab4cf9953cf19d2ab3a , < 8519e6883a942e510f33a0e634e27bcc3a844a40 (git) Affected: 3a58f13a881ed351198ffab4cf9953cf19d2ab3a , < 6ce948fa54599f369ff7fe8b793a6aae4b0762b2 (git) Affected: 3a58f13a881ed351198ffab4cf9953cf19d2ab3a , < 026bbaeeab9e04534ee58882b6447300629b42f6 (git) Affected: 3a58f13a881ed351198ffab4cf9953cf19d2ab3a , < 6a877ececd6daa002a9a0002cd0fbca6592a9244 (git) Affected: 2a6efabed754c9dcf27e6def71317b374f58a852 (git) Affected: 5.17.7 , < 5.18 (semver)
Linux	Linux	Affected: 5.18 Unaffected: 0 , < 5.18 (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.77 , ≤ 6.12.* (semver) Unaffected: 6.18.17 , ≤ 6.18.* (semver) Unaffected: 6.19.7 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/rds/tcp.c"
          ],
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.17.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: Fix circular locking dependency in rds_tcp_tune\n\nsyzbot reported a circular locking dependency in rds_tcp_tune() where\nsk_net_refcnt_upgrade() is called while holding the socket lock:\n\n======================================================\nWARNING: possible circular locking dependency detected\n======================================================\nkworker/u10:8/15040 is trying to acquire lock:\nffffffff8e9aaf80 (fs_reclaim){+.+.}-{0:0},\nat: __kmalloc_cache_noprof+0x4b/0x6f0\n\nbut task is already holding lock:\nffff88805a3c1ce0 (k-sk_lock-AF_INET6){+.+.}-{0:0},\nat: rds_tcp_tune+0xd7/0x930\n\nThe issue occurs because sk_net_refcnt_upgrade() performs memory\nallocation (via get_net_track() -\u003e ref_tracker_alloc()) while the\nsocket lock is held, creating a circular dependency with fs_reclaim.\n\nFix this by moving sk_net_refcnt_upgrade() outside the socket lock\ncritical section. This is safe because the fields modified by the\nsk_net_refcnt_upgrade() call (sk_net_refcnt, ns_tracker) are not\naccessed by any concurrent code path at this point.\n\nv2:\n  - Corrected fixes tag\n  - check patch line wrap nits\n  - ai commentary nits"
        }
      ],
      "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 - RDS/TCP creates a listener on TCP port 16385, and an unauthenticated remote TCP connection reaches rds_tcp_accept_one() and rds_tcp_tune() before protocol-level validation. A local AF_RDS path also exists, but the highest reasonable vector is network.\nAC:L - The attacker can repeatedly trigger the vulnerable lock ordering by opening RDS/TCP connections; no special packet format, credentials, or attacker-uncontrolled race is needed to reach the bad allocation-under-socket-lock path. Applying the higher-severity rule, this is Low complexity.\nPR:N - The network accept path requires no local account, capabilities, or RDS authentication before rds_tcp_tune() is invoked. Remote reachability to the RDS/TCP listener is sufficient in a reasonable affected deployment.\nUI:N - No victim user action is required. The attacker can initiate the connection directly.\nS:U - The issue affects kernel locking within the same host security authority. It does not cross a VM, container, IOMMU, or other separate security scope boundary.\nC:N - The bug is a circular locking dependency involving sk_lock, sk_net_refcnt_upgrade(), ref_tracker allocation, and fs_reclaim. It does not expose kernel memory or create a read primitive.\nI:N - There is no memory corruption or write primitive; the fix only moves a refcount-tracker allocation outside the socket lock. Integrity is not directly impacted.\nA:H - The lock inversion can lead to a kernel deadlock or system hang, and syzbot reported it as a possible deadlock in the RDS accept worker. Kernel deadlock is High availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:21:36.998Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8babb271403378ba6836f6c8599c5313d0e2355d"
        },
        {
          "url": "https://git.kernel.org/stable/c/8519e6883a942e510f33a0e634e27bcc3a844a40"
        },
        {
          "url": "https://git.kernel.org/stable/c/6ce948fa54599f369ff7fe8b793a6aae4b0762b2"
        },
        {
          "url": "https://git.kernel.org/stable/c/026bbaeeab9e04534ee58882b6447300629b42f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/6a877ececd6daa002a9a0002cd0fbca6592a9244"
        }
      ],
      "title": "net/rds: Fix circular locking dependency in rds_tcp_tune",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23419",
    "datePublished": "2026-04-03T13:24:23.958Z",
    "dateReserved": "2026-01-13T15:37:46.014Z",
    "dateUpdated": "2026-08-05T12:21:36.998Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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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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.
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