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CVE-2022-49765

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

net/9p: use a dedicated spinlock for trans_fd

Shamelessly copying the explanation from Tetsuo Handa's suggested patch[1] (slightly reworded): syzbot is reporting inconsistent lock state in p9_req_put()[2], for p9_tag_remove() from p9_req_put() from IRQ context is using spin_lock_irqsave() on "struct p9_client"->lock but trans_fd (not from IRQ context) is using spin_lock().

Since the locks actually protect different things in client.c and in trans_fd.c, just replace trans_fd.c's lock by a new one specific to the transport (client.c's protect the idr for fid/tag allocations, while trans_fd.c's protects its own req list and request status field that acts as the transport's state machine)

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2022-49765",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "673d62cdaac6ffbce980a349d3174b3929ceb9e5",
              "lessThan": "43bbadb7e4636dc02f6a283c2a39e6438e6173cd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "673d62cdaac6ffbce980a349d3174b3929ceb9e5",
              "lessThan": "717b9b4f38703d7f5293059e3a242d16f76fa045",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "673d62cdaac6ffbce980a349d3174b3929ceb9e5",
              "lessThan": "296ab4a813841ba1d5f40b03190fd1bd8f25aab0",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/9p/trans_fd.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.28"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.28",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.80",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.0.10",
              "versionType": "semver",
              "lessThanOrEqual": "6.0.*"
            },
            {
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/9p/trans_fd.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-05-01T15:15:59.277",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/296ab4a813841ba1d5f40b03190fd1bd8f25aab0",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/43bbadb7e4636dc02f6a283c2a39e6438e6173cd",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/717b9b4f38703d7f5293059e3a242d16f76fa045",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-667"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/9p: use a dedicated spinlock for trans_fd\n\nShamelessly copying the explanation from Tetsuo Handa's suggested\npatch[1] (slightly reworded):\nsyzbot is reporting inconsistent lock state in p9_req_put()[2],\nfor p9_tag_remove() from p9_req_put() from IRQ context is using\nspin_lock_irqsave() on \"struct p9_client\"->lock but trans_fd\n(not from IRQ context) is using spin_lock().\n\nSince the locks actually protect different things in client.c and in\ntrans_fd.c, just replace trans_fd.c's lock by a new one specific to the\ntransport (client.c's protect the idr for fid/tag allocations,\nwhile trans_fd.c's protects its own req list and request status field\nthat acts as the transport's state machine)"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/9p: uso de un spinlock dedicado para trans_fd. Copiando descaradamente la explicación del parche sugerido por Tetsuo Handa[1] (ligeramente reformulada): syzbot reporta un estado de bloqueo inconsistente en p9_req_put()[2], para p9_tag_remove() desde p9_req_put() desde el contexto IRQ, se usa spin_lock_irqsave() en \"struct p9_client\"->lock, pero trans_fd (no desde el contexto IRQ) usa spin_lock(). Dado que los bloqueos protegen elementos diferentes en client.c y en trans_fd.c, simplemente reemplace el bloqueo de trans_fd.c por uno nuevo específico para el transporte (el de client.c protege el IDR para las asignaciones de FID/etiqueta, mientras que el de trans_fd.c protege su propia lista de solicitudes y el campo de estado de la solicitud, que actúa como la máquina de estados del transporte)."
    }
  ],
  "lastModified": "2026-06-17T05:19:05.637",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "15DB3C25-553E-4AFA-AD20-45C84054F9CD",
              "versionEndExcluding": "5.15.80"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "64F9ADD1-3ADB-4D66-A00F-4A83010B05F0",
              "versionEndExcluding": "6.0.10",
              "versionStartIncluding": "5.16"
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          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}