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CVE-2024-56584

Estado: ModificadaMedia (5.5)—

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

io_uring/tctx: work around xa_store() allocation error issue

syzbot triggered the following WARN_ON:

which is the

sanity check in __io_uring_free() when a io_uring_task is going through its final put. The syzbot test case includes injecting memory allocation failures, and it very much looks like xa_store() can fail one of its memory allocations and end up with ->head being non-NULL even though no entries exist in the xarray.

Until this issue gets sorted out, work around it by attempting to iterate entries in our xarray, and WARN_ON_ONCE() if one is found.

Detalles técnicos trazas, registros y código del informe original
WARNING: CPU: 0 PID: 16 at io_uring/tctx.c:51 __io_uring_free+0xfa/0x140 io_uring/tctx.c:51

WARN_ON_ONCE(!xa_empty(&tctx->xa));

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)

Mostrar
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          "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",
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/tctx: work around xa_store() allocation error issue\n\nsyzbot triggered the following WARN_ON:\n\nWARNING: CPU: 0 PID: 16 at io_uring/tctx.c:51 __io_uring_free+0xfa/0x140 io_uring/tctx.c:51\n\nwhich is the\n\nWARN_ON_ONCE(!xa_empty(&tctx->xa));\n\nsanity check in __io_uring_free() when a io_uring_task is going through\nits final put. The syzbot test case includes injecting memory allocation\nfailures, and it very much looks like xa_store() can fail one of its\nmemory allocations and end up with ->head being non-NULL even though no\nentries exist in the xarray.\n\nUntil this issue gets sorted out, work around it by attempting to\niterate entries in our xarray, and WARN_ON_ONCE() if one is found."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: io_uring/tctx: workaround al problema de error de asignación de xa_store() syzbot activó el siguiente WARN_ON: WARNING: CPU: 0 PID: 16 en io_uring/tctx.c:51 __io_uring_free+0xfa/0x140 io_uring/tctx.c:51 que es la comprobación de cordura WARN_ON_ONCE(!xa_empty(&tctx->xa)); en __io_uring_free() cuando una io_uring_task está pasando por su put final. El caso de prueba de syzbot incluye la inyección de fallos de asignación de memoria, y parece que xa_store() puede fallar en una de sus asignaciones de memoria y terminar con ->head siendo distinto de NULL aunque no existan entradas en la matriz x. Hasta que se resuelva este problema, puede solucionarlo intentando iterar las entradas en nuestra matriz x y usar WARN_ON_ONCE() si encuentra alguna."
    }
  ],
  "lastModified": "2026-06-17T08:12:28.473",
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