CVE-2026-90250 (GCVE-0-2026-90250)
Vulnerability from cvelistv5
Published
2026-09-17 16:07
Modified
2026-10-30 12:34
Severity ?
Summary
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. Fix this by rejecting a link update if new_prog's cgroup storage is incompatible with link->prog.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab
Version: 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab
Version: 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab
Version: 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab
Version: 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab
Version: 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab
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{
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      "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\u0027s cgroup storage is\nincompatible with link-\u003eprog."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:34:56.117Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/85785e7e2ebddcaa5c3b31bd3bcd83ae648985d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/16c8321ee40c420f8e02e09515a5126682ddf4ea"
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        {
          "url": "https://git.kernel.org/stable/c/a033c950f6731be88a7da98604ed78f302f15b80"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ab3da12061d7ccb099f7e925fa2d865967a316a"
        },
        {
          "url": "https://git.kernel.org/stable/c/12feca126831556dc7fabe5a3ba28fbd328768b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94"
        }
      ],
      "title": "bpf, cgroup: Fix storage null-ptr-deref after replacing prog",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90250",
    "datePublished": "2026-09-17T16:07:51.403Z",
    "dateReserved": "2026-09-11T19:38:34.795Z",
    "dateUpdated": "2026-10-30T12:34:56.117Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}


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