FKIE_CVE-2026-45838

Vulnerability from fkie_nvd - Published: 2026-05-27 11:16 - Updated: 2026-05-27 14:48
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: fix end-of-list detection in cgroup_storage_get_next_key() list_next_entry() never returns NULL -- when the current element is the last entry it wraps to the list head via container_of(). The subsequent NULL check is therefore dead code and get_next_key() never returns -ENOENT for the last element, instead reading storage->key from a bogus pointer that aliases internal map fields and copying the result to userspace. Replace it with list_entry_is_head() so the function correctly returns -ENOENT when there are no more entries.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/32ce55d424395904986f5066f8755f6cb9993377
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5828b9e5b272ecff7cf5d345128d3de7324117f7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/85a2f30e40f7468db732f55659bc6318874f49af
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b4b5a20bed82130da2f2818f04d52378952fbd0b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fc39753b7f92e09177777e9c648afe5aa3abb81f
Impacted products
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix end-of-list detection in cgroup_storage_get_next_key()\n\nlist_next_entry() never returns NULL -- when the current element is the\nlast entry it wraps to the list head via container_of(). The subsequent\nNULL check is therefore dead code and get_next_key() never returns\n-ENOENT for the last element, instead reading storage-\u003ekey from a bogus\npointer that aliases internal map fields and copying the result to\nuserspace.\n\nReplace it with list_entry_is_head() so the function correctly returns\n-ENOENT when there are no more entries."
    }
  ],
  "id": "CVE-2026-45838",
  "lastModified": "2026-05-27T14:48:03.013",
  "metrics": {},
  "published": "2026-05-27T11:16:23.130",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/32ce55d424395904986f5066f8755f6cb9993377"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5828b9e5b272ecff7cf5d345128d3de7324117f7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/85a2f30e40f7468db732f55659bc6318874f49af"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b4b5a20bed82130da2f2818f04d52378952fbd0b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fc39753b7f92e09177777e9c648afe5aa3abb81f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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