Vulnerability-Lookup

FKIE_CVE-2025-71113

Vulnerability from fkie_nvd - Published: 2026-01-14 15:16 - Updated: 2026-10-19 19:17

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

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/51a5ab36084f3251ef87eda3e6a6236f6488925e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/543bf004e4eafbb302b1e6c78570d425d2ca13a0	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5a4b65523608974a81edbe386f8a667a3e10c726	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6f6e309328d53a10c0fe1f77dec2db73373179b6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/84238876e3b3b262cf62d5f4d1338e983fb27010	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e125c8e346e4eb7b3e854c862fcb4392bc13ddba	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f81244fd6b14fecfa93b66b6bb1d59f96554e550	Patch
0b142b55-0307-4c5a-b3c9-f314f3fb7c5e	https://cert-portal.siemens.com/productcert/html/ssa-019113.html
0b142b55-0307-4c5a-b3c9-f314f3fb7c5e	https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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

JSON

To clipboard

{
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  "cveTags": [],
  "descriptions": [
    {
      "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."
    }
  ],
  "id": "CVE-2025-71113",
  "lastModified": "2026-10-19T19:17:12.997",
  "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"
      }
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    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-71113",
          "options": [
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              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-10T20:40:47.263259Z",
          "version": "2.0.3"
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  "published": "2026-01-14T15:16:00.433",
  "references": [
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      "url": "https://git.kernel.org/stable/c/51a5ab36084f3251ef87eda3e6a6236f6488925e"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-908"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-119"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}

CVE-2025-71113 (GCVE-0-2025-71113)

Vulnerability from cvelistv5 – Published: 2026-01-14 15:05 – Updated: 2026-10-19 18:15

Title

crypto: af_alg - zero initialize memory allocated via sock_kmalloc

Summary

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-10 20:40 UTC

CWE

CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6651 records in the last 180 days details

References

9 references

URL	Tags
https://git.kernel.org/stable/c/e125c8e346e4eb7b3…
https://git.kernel.org/stable/c/543bf004e4eafbb30…
https://git.kernel.org/stable/c/f81244fd6b14fecfa…
https://git.kernel.org/stable/c/84238876e3b3b262c…
https://git.kernel.org/stable/c/5a4b65523608974a8…
https://git.kernel.org/stable/c/51a5ab36084f3251e…
https://git.kernel.org/stable/c/6f6e309328d53a10c…
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

8 products

Vendor	Product	Version
Linux	Linux	Affected: fe869cdb89c95d060c77eea20204d6c91f233b53 , < e125c8e346e4eb7b3e854c862fcb4392bc13ddba (git) Affected: fe869cdb89c95d060c77eea20204d6c91f233b53 , < 543bf004e4eafbb302b1e6c78570d425d2ca13a0 (git) Affected: fe869cdb89c95d060c77eea20204d6c91f233b53 , < f81244fd6b14fecfa93b66b6bb1d59f96554e550 (git) Affected: fe869cdb89c95d060c77eea20204d6c91f233b53 , < 84238876e3b3b262cf62d5f4d1338e983fb27010 (git) Affected: fe869cdb89c95d060c77eea20204d6c91f233b53 , < 5a4b65523608974a81edbe386f8a667a3e10c726 (git) Affected: fe869cdb89c95d060c77eea20204d6c91f233b53 , < 51a5ab36084f3251ef87eda3e6a6236f6488925e (git) Affected: fe869cdb89c95d060c77eea20204d6c91f233b53 , < 6f6e309328d53a10c0fe1f77dec2db73373179b6 (git)
Linux	Linux	Affected: 2.6.38 Unaffected: 0 , < 2.6.38 (semver) Unaffected: 5.10.248 , ≤ 5.10.* (semver) Unaffected: 5.15.198 , ≤ 5.15.* (semver) Unaffected: 6.1.160 , ≤ 6.1.* (semver) Unaffected: 6.6.120 , ≤ 6.6.* (semver) Unaffected: 6.12.64 , ≤ 6.12.* (semver) Unaffected: 6.18.3 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.7 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.7 , < * (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.7 , < * (custom)

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{
  "containers": {
    "adp": [
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        "metrics": [
          {
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              "content": {
                "id": "CVE-2025-71113",
                "options": [
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                  },
                  {
                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-06-10T20:40:47.263259Z",
                "version": "2.0.3"
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                "description": "CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer",
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          "shortName": "siemens-SADP"
        },
        "references": [
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
          },
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
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        "x_adpType": "supplier"
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    ],
    "cna": {
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          "product": "Linux",
          "programFiles": [
            "crypto/af_alg.c",
            "crypto/algif_hash.c",
            "crypto/algif_rng.c"
          ],
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              "versionType": "git"
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              "version": "2.6.38"
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            },
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.198",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.160",
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            },
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              "lessThanOrEqual": "6.12.*",
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              "lessThanOrEqual": "6.18.*",
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              "version": "6.18.3",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
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              "version": "6.19",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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Sightings

Author	Source	Type	Date	Other

Nomenclature

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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