CVE-2026-90393 (GCVE-0-2026-90393)
Vulnerability from cvelistv5
Published
2026-09-17 16:09
Modified
2026-10-19 09:02
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix potential UAF in bpf_netns_link_update_prog In bpf_netns_link_update_prog, the checks for old_prog and prog type are currently performed locklessly before acquiring netns_bpf_mutex. This creates a race condition that can lead to a UAF issue. If two threads concurrently execute BPF_LINK_UPDATE on the same netns link, the following execution path can trigger a UAF: CPU0 CPU1 bpf_netns_link_update_prog if (old_prog && old_prog != link->prog) return -EPERM; bpf_netns_link_update_prog if (old_prog && old_prog != link->prog) ... old_prog = xchg(&link->prog, new_prog); bpf_prog_put(old_prog); if (new_prog->type != link->prog->type) <-- trigger UAF Fix this by moving the old_prog and prog->type checks inside the netns_bpf_mutex critical section. Meanwhile, use guard() to simplify lock management and avoid all the goto jumping.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a
Version: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a
Version: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a
Version: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a
Version: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a
Version: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a
Version: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a
Version: 7f045a49fee04b5662cbdeaf0838f9322ae8c63a
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{
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          "programFiles": [
            "kernel/bpf/net_namespace.c"
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      "cpeApplicability": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix potential UAF in bpf_netns_link_update_prog\n\nIn bpf_netns_link_update_prog, the checks for old_prog and prog type\nare currently performed locklessly before acquiring netns_bpf_mutex.\nThis creates a race condition that can lead to a UAF issue.\n\nIf two threads concurrently execute BPF_LINK_UPDATE on the same netns\nlink, the following execution path can trigger a UAF:\n\nCPU0                                          CPU1\nbpf_netns_link_update_prog\n  if (old_prog \u0026\u0026 old_prog != link-\u003eprog)\n    return -EPERM;\n                                              bpf_netns_link_update_prog\n                                                if (old_prog \u0026\u0026 old_prog != link-\u003eprog)\n                                                ...\n                                                old_prog = xchg(\u0026link-\u003eprog, new_prog);\n                                                bpf_prog_put(old_prog);\n  if (new_prog-\u003etype != link-\u003eprog-\u003etype) \u003c-- trigger UAF\n\nFix this by moving the old_prog and prog-\u003etype checks inside the\nnetns_bpf_mutex critical section. Meanwhile, use guard() to simplify\nlock management and avoid all the goto jumping."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:02:57.658Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d462b5481d77ce7df8a5ff89a699386f00c9214d"
        },
        {
          "url": "https://git.kernel.org/stable/c/bdddf3e1493ee973619c154a57071ce67f78598b"
        },
        {
          "url": "https://git.kernel.org/stable/c/79a66fd997d4eecf17302d613194879eb32e0986"
        },
        {
          "url": "https://git.kernel.org/stable/c/f4ce6803df4095777191d800bebc50219b615ca0"
        },
        {
          "url": "https://git.kernel.org/stable/c/277168cb9d153ce8e9c3f9275670e32ae61b41d6"
        },
        {
          "url": "https://git.kernel.org/stable/c/bda86e9f31b9a296b6e64a51c91dc776fc9f613e"
        },
        {
          "url": "https://git.kernel.org/stable/c/923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/5c5997836381010fc5907b36bc17d3b19407e933"
        }
      ],
      "title": "bpf: Fix potential UAF in bpf_netns_link_update_prog",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90393",
    "datePublished": "2026-09-17T16:09:26.388Z",
    "dateReserved": "2026-09-11T19:38:34.810Z",
    "dateUpdated": "2026-10-19T09:02:57.658Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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