« Volver al listado

CVE-2025-40012

Estado: AplazadaAlta (7.8)—

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

net/smc: fix warning in smc_rx_splice() when calling get_page()

smc_lo_register_dmb() allocates DMB buffers with kzalloc(), which are later passed to get_page() in smc_rx_splice(). Since kmalloc memory is not page-backed, this triggers WARN_ON_ONCE() in get_page() and prevents holding a refcount on the buffer. This can lead to use-after-free if the memory is released before splice_to_pipe() completes.

Use folio_alloc() instead, ensuring DMBs are page-backed and safe for get_page().

Detalles técnicos trazas, registros y código del informe original
WARNING: CPU: 18 PID: 12152 at ./include/linux/mm.h:1330 smc_rx_splice+0xaf8/0xe20 [smc]
CPU: 18 UID: 0 PID: 12152 Comm: smcapp Kdump: loaded Not tainted 6.17.0-rc3-11705-g9cf4672ecfee #10 NONE
Hardware name: IBM 3931 A01 704 (z/VM 7.4.0)
Krnl PSW : 0704e00180000000 000793161032696c (smc_rx_splice+0xafc/0xe20 [smc])
           R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3
Krnl GPRS: 0000000000000000 001cee80007d3001 00077400000000f8 0000000000000005
           0000000000000001 001cee80007d3006 0007740000001000 001c000000000000
           000000009b0c99e0 0000000000001000 001c0000000000f8 001c000000000000
           000003ffcc6f7c88 0007740003e98000 0007931600000005 000792969b2ff7b8
Krnl Code: 0007931610326960: af000000		mc	0,0
           0007931610326964: a7f4ff43		brc	15,00079316103267ea
          #0007931610326968: af000000		mc	0,0
          >000793161032696c: a7f4ff3f		brc	15,00079316103267ea
           0007931610326970: e320f1000004	lg	%r2,256(%r15)
           0007931610326976: c0e53fd1b5f5	brasl	%r14,000793168fd5d560
           000793161032697c: a7f4fbb5		brc	15,00079316103260e6
           0007931610326980: b904002b		lgr	%r2,%r11
Call Trace:
 smc_rx_splice+0xafc/0xe20 [smc]
 smc_rx_splice+0x756/0xe20 [smc])
 smc_rx_recvmsg+0xa74/0xe00 [smc]
 smc_splice_read+0x1ce/0x3b0 [smc]
 sock_splice_read+0xa2/0xf0
 do_splice_read+0x198/0x240
 splice_file_to_pipe+0x7e/0x110
 do_splice+0x59e/0xde0
 __do_splice+0x11a/0x2d0
 __s390x_sys_splice+0x140/0x1f0
 __do_syscall+0x122/0x280
 system_call+0x6e/0x90
Last Breaking-Event-Address:
smc_rx_splice+0x960/0xe20 [smc]
---[ end trace 0000000000000000 ]---

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:L PR:L sin UI indica escalada local (T1068). Use-after-free puede causar DoS (T1499.004) o ejecución; acceso local con privilegios (PR:L) sugiere impacto en cuentas/permisos.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Application Developer GuidanceActive Directory ConfigurationUser TrainingUser Account ManagementThreat Intelligence ProgramPrivileged Account Management

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2025-40012",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "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": "f7a22071dbf316c982fb44308874bd7ad9ac2091",
              "lessThan": "14fc4fdae42e34d7ee871b292ac2ecc61c2c5de7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f7a22071dbf316c982fb44308874bd7ad9ac2091",
              "lessThan": "d5411685dc2f6ac7bdf01a0a204d56cae38c6cf6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f7a22071dbf316c982fb44308874bd7ad9ac2091",
              "lessThan": "a35c04de2565db191726b5741e6b66a35002c652",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/smc/smc_loopback.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.10",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.50",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.16.10",
              "versionType": "semver",
              "lessThanOrEqual": "6.16.*"
            },
            {
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/smc/smc_loopback.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-10-20T16:15:37.937",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/14fc4fdae42e34d7ee871b292ac2ecc61c2c5de7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a35c04de2565db191726b5741e6b66a35002c652",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d5411685dc2f6ac7bdf01a0a204d56cae38c6cf6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix warning in smc_rx_splice() when calling get_page()\n\nsmc_lo_register_dmb() allocates DMB buffers with kzalloc(), which are\nlater passed to get_page() in smc_rx_splice(). Since kmalloc memory is\nnot page-backed, this triggers WARN_ON_ONCE() in get_page() and prevents\nholding a refcount on the buffer. This can lead to use-after-free if\nthe memory is released before splice_to_pipe() completes.\n\nUse folio_alloc() instead, ensuring DMBs are page-backed and safe for\nget_page().\n\nWARNING: CPU: 18 PID: 12152 at ./include/linux/mm.h:1330 smc_rx_splice+0xaf8/0xe20 [smc]\nCPU: 18 UID: 0 PID: 12152 Comm: smcapp Kdump: loaded Not tainted 6.17.0-rc3-11705-g9cf4672ecfee #10 NONE\nHardware name: IBM 3931 A01 704 (z/VM 7.4.0)\nKrnl PSW : 0704e00180000000 000793161032696c (smc_rx_splice+0xafc/0xe20 [smc])\n           R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3\nKrnl GPRS: 0000000000000000 001cee80007d3001 00077400000000f8 0000000000000005\n           0000000000000001 001cee80007d3006 0007740000001000 001c000000000000\n           000000009b0c99e0 0000000000001000 001c0000000000f8 001c000000000000\n           000003ffcc6f7c88 0007740003e98000 0007931600000005 000792969b2ff7b8\nKrnl Code: 0007931610326960: af000000\t\tmc\t0,0\n           0007931610326964: a7f4ff43\t\tbrc\t15,00079316103267ea\n          #0007931610326968: af000000\t\tmc\t0,0\n          >000793161032696c: a7f4ff3f\t\tbrc\t15,00079316103267ea\n           0007931610326970: e320f1000004\tlg\t%r2,256(%r15)\n           0007931610326976: c0e53fd1b5f5\tbrasl\t%r14,000793168fd5d560\n           000793161032697c: a7f4fbb5\t\tbrc\t15,00079316103260e6\n           0007931610326980: b904002b\t\tlgr\t%r2,%r11\nCall Trace:\n smc_rx_splice+0xafc/0xe20 [smc]\n smc_rx_splice+0x756/0xe20 [smc])\n smc_rx_recvmsg+0xa74/0xe00 [smc]\n smc_splice_read+0x1ce/0x3b0 [smc]\n sock_splice_read+0xa2/0xf0\n do_splice_read+0x198/0x240\n splice_file_to_pipe+0x7e/0x110\n do_splice+0x59e/0xde0\n __do_splice+0x11a/0x2d0\n __s390x_sys_splice+0x140/0x1f0\n __do_syscall+0x122/0x280\n system_call+0x6e/0x90\nLast Breaking-Event-Address:\nsmc_rx_splice+0x960/0xe20 [smc]\n---[ end trace 0000000000000000 ]---"
    }
  ],
  "lastModified": "2026-07-30T06:24:06.137",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}