FKIE_CVE-2025-71113

Vulnerability from fkie_nvd - Published: 2026-01-14 15:16 - Updated: 2026-03-25 19:58
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: crypto: af_alg - zero initialize memory allocated via sock_kmalloc Several crypto user API contexts and requests allocated with sock_kmalloc() were left uninitialized, relying on callers to set fields explicitly. This resulted in the use of uninitialized data in certain error paths or when new fields are added in the future. The ACVP patches also contain two user-space interface files: algif_kpp.c and algif_akcipher.c. These too rely on proper initialization of their context structures. A particular issue has been observed with the newly added 'inflight' variable introduced in af_alg_ctx by commit: 67b164a871af ("crypto: af_alg - Disallow multiple in-flight AIO requests") Because the context is not memset to zero after allocation, the inflight variable has contained garbage values. As a result, af_alg_alloc_areq() has incorrectly returned -EBUSY randomly when the garbage value was interpreted as true: https://github.com/gregkh/linux/blame/master/crypto/af_alg.c#L1209 The check directly tests ctx->inflight without explicitly comparing against true/false. Since inflight is only ever set to true or false later, an uninitialized value has triggered -EBUSY failures. Zero-initializing memory allocated with sock_kmalloc() ensures inflight and other fields start in a known state, removing random issues caused by uninitialized data.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/51a5ab36084f3251ef87eda3e6a6236f6488925ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/543bf004e4eafbb302b1e6c78570d425d2ca13a0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5a4b65523608974a81edbe386f8a667a3e10c726Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6f6e309328d53a10c0fe1f77dec2db73373179b6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/84238876e3b3b262cf62d5f4d1338e983fb27010Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e125c8e346e4eb7b3e854c862fcb4392bc13ddbaPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f81244fd6b14fecfa93b66b6bb1d59f96554e550Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 2.6.38
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
To clipboard 

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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: af_alg - zero initialize memory allocated via sock_kmalloc\n\nSeveral crypto user API contexts and requests allocated with\nsock_kmalloc() were left uninitialized, relying on callers to\nset fields explicitly. This resulted in the use of uninitialized\ndata in certain error paths or when new fields are added in the\nfuture.\n\nThe ACVP patches also contain two user-space interface files:\nalgif_kpp.c and algif_akcipher.c. These too rely on proper\ninitialization of their context structures.\n\nA particular issue has been observed with the newly added\n\u0027inflight\u0027 variable introduced in af_alg_ctx by commit:\n\n  67b164a871af (\"crypto: af_alg - Disallow multiple in-flight AIO requests\")\n\nBecause the context is not memset to zero after allocation,\nthe inflight variable has contained garbage values. As a result,\naf_alg_alloc_areq() has incorrectly returned -EBUSY randomly when\nthe garbage value was interpreted as true:\n\n  https://github.com/gregkh/linux/blame/master/crypto/af_alg.c#L1209\n\nThe check directly tests ctx-\u003einflight without explicitly\ncomparing against true/false. Since inflight is only ever set to\ntrue or false later, an uninitialized value has triggered\n-EBUSY failures. Zero-initializing memory allocated with\nsock_kmalloc() ensures inflight and other fields start in a known\nstate, removing random issues caused by uninitialized data."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrypto: af_alg - inicializar a cero la memoria asignada a trav\u00e9s de sock_kmalloc\n\nVarios contextos y solicitudes de API de usuario de criptograf\u00eda asignados con sock_kmalloc() quedaron sin inicializar, dependiendo de que los llamadores establecieran los campos expl\u00edcitamente. Esto result\u00f3 en el uso de datos no inicializados en ciertas rutas de error o cuando se a\u00f1adan nuevos campos en el futuro.\n\nLos parches ACVP tambi\u00e9n contienen dos archivos de interfaz de espacio de usuario: algif_kpp.c y algif_akcipher.c. Estos tambi\u00e9n dependen de la inicializaci\u00f3n adecuada de sus estructuras de contexto.\n\nSe ha observado un problema particular con la variable \u0027inflight\u0027 reci\u00e9n a\u00f1adida introducida en af_alg_ctx por el commit:\n\n67b164a871af (\u0027crypto: af_alg - Disallow multiple in-flight AIO requests\u0027)\n\nDebido a que el contexto no se inicializa a cero con memset despu\u00e9s de la asignaci\u00f3n, la variable inflight ha contenido valores basura. Como resultado, af_alg_alloc_areq() ha devuelto incorrectamente -EBUSY de forma aleatoria cuando el valor basura fue interpretado como verdadero:\n\nhttps://github.com/gregkh/linux/blame/master/crypto/af_alg.c#L1209\n\nLa comprobaci\u00f3n prueba directamente ctx-\u0026gt;inflight sin comparar expl\u00edcitamente con verdadero/falso. Dado que inflight solo se establece como verdadero o falso m\u00e1s tarde, un valor no inicializado ha provocado fallos -EBUSY. La inicializaci\u00f3n a cero de la memoria asignada con sock_kmalloc() asegura que inflight y otros campos comiencen en un estado conocido, eliminando problemas aleatorios causados por datos no inicializados."
    }
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  "id": "CVE-2025-71113",
  "lastModified": "2026-03-25T19:58:42.463",
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          "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",
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        "impactScore": 3.6,
        "source": "nvd@nist.gov",
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  "published": "2026-01-14T15:16:00.433",
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          "value": "CWE-908"
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      "source": "nvd@nist.gov",
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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