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CVE-2022-49732

Estado: AnalizadaMedia (5.5)—

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

sock: redo the psock vs ULP protection check

Commit 8a59f9d1e3d4 ("sock: Introduce sk->sk_prot->psock_update_sk_prot()") has moved the inet_csk_has_ulp(sk) check from sk_psock_init() to the new tcp_bpf_update_proto() function. I'm guessing that this was done to allow creating psocks for non-inet sockets.

Unfortunately the destruction path for psock includes the ULP unwind, so we need to fail the sk_psock_init() itself. Otherwise if ULP is already present we'll notice that later, and call tcp_update_ulp() with the sk_proto of the ULP itself, which will most likely result in the ULP looping its callbacks.

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-2022-49732",
  "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": "8a59f9d1e3d4340659fdfee8879dc09a6f2546e1",
              "lessThan": "72fa0f65b56605b8a9ae9fba2082f2123f7fe017",
              "versionType": "git"
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            {
              "status": "affected",
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              "lessThan": "e34a07c0ae3906f97eb18df50902e2a01c1015b6",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "include/net/inet_sock.h",
            "net/core/skmsg.c",
            "net/ipv4/tcp_bpf.c",
            "net/tls/tls_main.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
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          "vendor": "Linux",
          "product": "Linux",
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              "status": "affected",
              "version": "5.13"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.13",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.51",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "5.18.8",
              "versionType": "semver",
              "lessThanOrEqual": "5.18.*"
            },
            {
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "include/net/inet_sock.h",
            "net/core/skmsg.c",
            "net/ipv4/tcp_bpf.c",
            "net/tls/tls_main.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-02-26T15:15:17.843",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/72fa0f65b56605b8a9ae9fba2082f2123f7fe017",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/922309e50befb0cfa5cb65e4989b7706d6578846",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e34a07c0ae3906f97eb18df50902e2a01c1015b6",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsock: redo the psock vs ULP protection check\n\nCommit 8a59f9d1e3d4 (\"sock: Introduce sk->sk_prot->psock_update_sk_prot()\")\nhas moved the inet_csk_has_ulp(sk) check from sk_psock_init() to\nthe new tcp_bpf_update_proto() function. I'm guessing that this\nwas done to allow creating psocks for non-inet sockets.\n\nUnfortunately the destruction path for psock includes the ULP\nunwind, so we need to fail the sk_psock_init() itself.\nOtherwise if ULP is already present we'll notice that later,\nand call tcp_update_ulp() with the sk_proto of the ULP\nitself, which will most likely result in the ULP looping\nits callbacks."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sock: rehacer la comprobación de protección psock vs ULP el commit 8a59f9d1e3d4 (\"sock: Introduce sk->sk_prot->psock_update_sk_prot()\") ha movido la comprobación inet_csk_has_ulp(sk) de sk_psock_init() a la nueva función tcp_bpf_update_proto(). Supongo que esto se hizo para permitir la creación de psocks para sockets que no sean inet. Desafortunadamente, la ruta de destrucción para psock incluye el desenrollado de ULP, por lo que debemos hacer que falle el propio sk_psock_init(). De lo contrario, si ULP ya está presente, lo notaremos más tarde y llamaremos a tcp_update_ulp() con el sk_proto del propio ULP, lo que probablemente provocará que el ULP repita sus devoluciones de llamadas."
    }
  ],
  "lastModified": "2026-06-17T05:18:59.767",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}