FKIE_CVE-2022-49765

Vulnerability from fkie_nvd - Published: 2025-05-01 15:15 - Updated: 2026-06-17 05:19
Severity
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/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)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/296ab4a813841ba1d5f40b03190fd1bd8f25aab0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/43bbadb7e4636dc02f6a283c2a39e6438e6173cdPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/717b9b4f38703d7f5293059e3a242d16f76fa045Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/9p/trans_fd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "43bbadb7e4636dc02f6a283c2a39e6438e6173cd",
              "status": "affected",
              "version": "673d62cdaac6ffbce980a349d3174b3929ceb9e5",
              "versionType": "git"
            },
            {
              "lessThan": "717b9b4f38703d7f5293059e3a242d16f76fa045",
              "status": "affected",
              "version": "673d62cdaac6ffbce980a349d3174b3929ceb9e5",
              "versionType": "git"
            },
            {
              "lessThan": "296ab4a813841ba1d5f40b03190fd1bd8f25aab0",
              "status": "affected",
              "version": "673d62cdaac6ffbce980a349d3174b3929ceb9e5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/9p/trans_fd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.28"
            },
            {
              "lessThan": "2.6.28",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.80",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "15DB3C25-553E-4AFA-AD20-45C84054F9CD",
              "versionEndExcluding": "5.15.80",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "64F9ADD1-3ADB-4D66-A00F-4A83010B05F0",
              "versionEndExcluding": "6.0.10",
              "versionStartIncluding": "5.16",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "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\u0027s 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\"-\u003elock 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\u0027s lock by a new one specific to the\ntransport (client.c\u0027s protect the idr for fid/tag allocations,\nwhile trans_fd.c\u0027s protects its own req list and request status field\nthat acts as the transport\u0027s 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 explicaci\u00f3n 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\"-\u0026gt;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 espec\u00edfico 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 act\u00faa como la m\u00e1quina de estados del transporte)."
    }
  ],
  "id": "CVE-2022-49765",
  "lastModified": "2026-06-17T05:19:05.637",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "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"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-05-01T15:15:59.277",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/296ab4a813841ba1d5f40b03190fd1bd8f25aab0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/43bbadb7e4636dc02f6a283c2a39e6438e6173cd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/717b9b4f38703d7f5293059e3a242d16f76fa045"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-667"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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