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CVE-2026-53106

Estado: AnalizadaMedia (5.5)—

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

bpf: Do not allow deleting local storage in NMI

Currently, local storage may deadlock when deferring freeing selem or local storage through kfree_rcu(), call_rcu() or call_rcu_tasks_trace() in NMI or reentrant. Since deleting selem in NMI is an unlikely use case, partially mitigate it by returning error when calling from bpf_xxx_storage_delete() helpers in NMI. Note that, it is still possible to deadlock through reentrant. A full mitigation requires returning error when irqs_disabled() is true, which, however is too heavy-handed for bpf_xxx_storage_delete().

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The long-term solution requires _nolock versions of call_rcu. Another possible solution is to defer the free through irq_work [0], but it would grow the size of selem, which is non-ideal.

The check is only needed in bpf_selem_unlink(), which is used by helpers and syscalls. bpf_selem_unlink_nofail() is fine as it is called during map and owner tear down that never run in NMI or reentrant.

[0] https://lore.kernel.org/bpf/20260205190233.912-1-alexei.starovoitov@gmail.com/

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-2026-53106",
  "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": "a10787e6d58c24b51e91c19c6d16c5da89fcaa4b",
              "lessThan": "e84acaf936970b5b0be2c93bbf255295ba9406df",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a10787e6d58c24b51e91c19c6d16c5da89fcaa4b",
              "lessThan": "350de5b8a9befaa2a68861c51f671d4f5f751ca5",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "kernel/bpf/bpf_local_storage.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.13",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "kernel/bpf/bpf_local_storage.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-06-24T17:17:24.860",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/350de5b8a9befaa2a68861c51f671d4f5f751ca5",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e84acaf936970b5b0be2c93bbf255295ba9406df",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-401"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Do not allow deleting local storage in NMI\n\nCurrently, local storage may deadlock when deferring freeing selem or\nlocal storage through kfree_rcu(), call_rcu() or call_rcu_tasks_trace()\nin NMI or reentrant. Since deleting selem in NMI is an unlikely use\ncase, partially mitigate it by returning error when calling from\nbpf_xxx_storage_delete() helpers in NMI. Note that, it is still possible\nto deadlock through reentrant. A full mitigation requires returning\nerror when irqs_disabled() is true, which, however is too heavy-handed\nfor bpf_xxx_storage_delete().\n\nThe long-term solution requires _nolock versions of call_rcu. Another\npossible solution is to defer the free through irq_work [0], but it\nwould grow the size of selem, which is non-ideal.\n\nThe check is only needed in bpf_selem_unlink(), which is used by helpers\nand syscalls. bpf_selem_unlink_nofail() is fine as it is called during\nmap and owner tear down that never run in NMI or reentrant.\n\n[0] https://lore.kernel.org/bpf/20260205190233.912-1-alexei.starovoitov@gmail.com/"
    }
  ],
  "lastModified": "2026-07-23T21:27:37.047",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EC0EBDB4-B53F-45D0-BCA0-D166CA19D872",
              "versionEndExcluding": "7.0.10",
              "versionStartIncluding": "5.13"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}