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CVE-2026-90250

Estado: RecibidaSin puntuar—

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

bpf, cgroup: Fix storage null-ptr-deref after replacing prog

Syzkaller reported a storage null-ptr-deref issue after replacing prog. This occurs in the following scenario: 1. prog A, an empty prog, is attached to a cgrp. 2. prog B uses BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE and calls the bpf_get_local_storage helper. 3. link_update is called to replace prog A with prog B.

The reason is that __cgroup_bpf_replace fails to alloc and assign the required cgrp storage for the incoming replacement prog. Consequently, the new prog inherits an uninit storage, leading to null-ptr-deref panic when kick the new prog.

Leer descripción completaMostrar menos

Fix this by rejecting a link update if new_prog's cgroup storage is incompatible with link->prog.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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)

⚠ 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)

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{
  "id": "CVE-2026-90250",
  "cveTags": [],
  "metrics": {},
  "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": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab",
              "lessThan": "a033c950f6731be88a7da98604ed78f302f15b80",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab",
              "lessThan": "1ab3da12061d7ccb099f7e925fa2d865967a316a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab",
              "lessThan": "12feca126831556dc7fabe5a3ba28fbd328768b6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab",
              "lessThan": "3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "kernel/bpf/cgroup.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.7"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.7",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "kernel/bpf/cgroup.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-17T17:17:21.237",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/12feca126831556dc7fabe5a3ba28fbd328768b6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1ab3da12061d7ccb099f7e925fa2d865967a316a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a033c950f6731be88a7da98604ed78f302f15b80",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, cgroup: Fix storage null-ptr-deref after replacing prog\n\nSyzkaller reported a storage null-ptr-deref issue after replacing prog.\nThis occurs in the following scenario:\n1. prog A, an empty prog, is attached to a cgrp.\n2. prog B uses BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE and calls the\n   bpf_get_local_storage helper.\n3. link_update is called to replace prog A with prog B.\n\nThe reason is that __cgroup_bpf_replace fails to alloc and assign the\nrequired cgrp storage for the incoming replacement prog. Consequently,\nthe new prog inherits an uninit storage, leading to null-ptr-deref panic\nwhen kick the new prog.\n\nFix this by rejecting a link update if new_prog's cgroup storage is\nincompatible with link->prog."
    }
  ],
  "lastModified": "2026-09-17T17:17:21.237",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}