CVE-2023-53843 (GCVE-0-2023-53843)

Vulnerability from cvelistv5 – Published: 2025-12-09 01:30 – Updated: 2025-12-09 01:30
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: reject negative ifindex Recent changes in net-next (commit 759ab1edb56c ("net: store netdevs in an xarray")) refactored the handling of pre-assigned ifindexes and let syzbot surface a latent problem in ovs. ovs does not validate ifindex, making it possible to create netdev ports with negative ifindex values. It's easy to repro with YNL: $ ./cli.py --spec netlink/specs/ovs_datapath.yaml \ --do new \ --json '{"upcall-pid": 1, "name":"my-dp"}' $ ./cli.py --spec netlink/specs/ovs_vport.yaml \ --do new \ --json '{"upcall-pid": "00000001", "name": "some-port0", "dp-ifindex":3,"ifindex":4294901760,"type":2}' $ ip link show -65536: some-port0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether 7a:48:21:ad:0b:fb brd ff:ff:ff:ff:ff:ff ... Validate the inputs. Now the second command correctly returns: $ ./cli.py --spec netlink/specs/ovs_vport.yaml \ --do new \ --json '{"upcall-pid": "00000001", "name": "some-port0", "dp-ifindex":3,"ifindex":4294901760,"type":2}' lib.ynl.NlError: Netlink error: Numerical result out of range nl_len = 108 (92) nl_flags = 0x300 nl_type = 2 error: -34 extack: {'msg': 'integer out of range', 'unknown': [[type:4 len:36] b'\x0c\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x03\x00\xff\xff\xff\x7f\x00\x00\x00\x00\x08\x00\x01\x00\x08\x00\x00\x00'], 'bad-attr': '.ifindex'} Accept 0 since it used to be silently ignored.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 54c4ef34c4b6f9720fded620e2893894f9f2c554 , < c965a58376146dcfdda186819462e8eb3aadef3a (git)
Affected: 54c4ef34c4b6f9720fded620e2893894f9f2c554 , < 881faff9e548a7ddfb11595be7c1c649217d27db (git)
Affected: 54c4ef34c4b6f9720fded620e2893894f9f2c554 , < a552bfa16bab4ce901ee721346a28c4e483f4066 (git)
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    Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 6.1.47 , ≤ 6.1.* (semver)
Unaffected: 6.4.12 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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{
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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/openvswitch/datapath.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: openvswitch: reject negative ifindex\n\nRecent changes in net-next (commit 759ab1edb56c (\"net: store netdevs\nin an xarray\")) refactored the handling of pre-assigned ifindexes\nand let syzbot surface a latent problem in ovs. ovs does not validate\nifindex, making it possible to create netdev ports with negative\nifindex values. It\u0027s easy to repro with YNL:\n\n$ ./cli.py --spec netlink/specs/ovs_datapath.yaml \\\n         --do new \\\n\t --json \u0027{\"upcall-pid\": 1, \"name\":\"my-dp\"}\u0027\n$ ./cli.py --spec netlink/specs/ovs_vport.yaml \\\n\t --do new \\\n\t --json \u0027{\"upcall-pid\": \"00000001\", \"name\": \"some-port0\", \"dp-ifindex\":3,\"ifindex\":4294901760,\"type\":2}\u0027\n\n$ ip link show\n-65536: some-port0: \u003cBROADCAST,MULTICAST\u003e mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000\n    link/ether 7a:48:21:ad:0b:fb brd ff:ff:ff:ff:ff:ff\n...\n\nValidate the inputs. Now the second command correctly returns:\n\n$ ./cli.py --spec netlink/specs/ovs_vport.yaml \\\n\t --do new \\\n\t --json \u0027{\"upcall-pid\": \"00000001\", \"name\": \"some-port0\", \"dp-ifindex\":3,\"ifindex\":4294901760,\"type\":2}\u0027\n\nlib.ynl.NlError: Netlink error: Numerical result out of range\nnl_len = 108 (92) nl_flags = 0x300 nl_type = 2\n\terror: -34\textack: {\u0027msg\u0027: \u0027integer out of range\u0027, \u0027unknown\u0027: [[type:4 len:36] b\u0027\\x0c\\x00\\x02\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x0c\\x00\\x03\\x00\\xff\\xff\\xff\\x7f\\x00\\x00\\x00\\x00\\x08\\x00\\x01\\x00\\x08\\x00\\x00\\x00\u0027], \u0027bad-attr\u0027: \u0027.ifindex\u0027}\n\nAccept 0 since it used to be silently ignored."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-09T01:30:05.698Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/c965a58376146dcfdda186819462e8eb3aadef3a"
        },
        {
          "url": "https://git.kernel.org/stable/c/881faff9e548a7ddfb11595be7c1c649217d27db"
        },
        {
          "url": "https://git.kernel.org/stable/c/a552bfa16bab4ce901ee721346a28c4e483f4066"
        }
      ],
      "title": "net: openvswitch: reject negative ifindex",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53843",
    "datePublished": "2025-12-09T01:30:05.698Z",
    "dateReserved": "2025-12-09T01:27:17.826Z",
    "dateUpdated": "2025-12-09T01:30:05.698Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53843\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-09T16:17:24.613\",\"lastModified\":\"2025-12-09T18:37:13.640\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: openvswitch: reject negative ifindex\\n\\nRecent changes in net-next (commit 759ab1edb56c (\\\"net: store netdevs\\nin an xarray\\\")) refactored the handling of pre-assigned ifindexes\\nand let syzbot surface a latent problem in ovs. ovs does not validate\\nifindex, making it possible to create netdev ports with negative\\nifindex values. It\u0027s easy to repro with YNL:\\n\\n$ ./cli.py --spec netlink/specs/ovs_datapath.yaml \\\\\\n         --do new \\\\\\n\\t --json \u0027{\\\"upcall-pid\\\": 1, \\\"name\\\":\\\"my-dp\\\"}\u0027\\n$ ./cli.py --spec netlink/specs/ovs_vport.yaml \\\\\\n\\t --do new \\\\\\n\\t --json \u0027{\\\"upcall-pid\\\": \\\"00000001\\\", \\\"name\\\": \\\"some-port0\\\", \\\"dp-ifindex\\\":3,\\\"ifindex\\\":4294901760,\\\"type\\\":2}\u0027\\n\\n$ ip link show\\n-65536: some-port0: \u003cBROADCAST,MULTICAST\u003e mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000\\n    link/ether 7a:48:21:ad:0b:fb brd ff:ff:ff:ff:ff:ff\\n...\\n\\nValidate the inputs. Now the second command correctly returns:\\n\\n$ ./cli.py --spec netlink/specs/ovs_vport.yaml \\\\\\n\\t --do new \\\\\\n\\t --json \u0027{\\\"upcall-pid\\\": \\\"00000001\\\", \\\"name\\\": \\\"some-port0\\\", \\\"dp-ifindex\\\":3,\\\"ifindex\\\":4294901760,\\\"type\\\":2}\u0027\\n\\nlib.ynl.NlError: Netlink error: Numerical result out of range\\nnl_len = 108 (92) nl_flags = 0x300 nl_type = 2\\n\\terror: -34\\textack: {\u0027msg\u0027: \u0027integer out of range\u0027, \u0027unknown\u0027: [[type:4 len:36] b\u0027\\\\x0c\\\\x00\\\\x02\\\\x00\\\\x00\\\\x00\\\\x00\\\\x00\\\\x00\\\\x00\\\\x00\\\\x00\\\\x0c\\\\x00\\\\x03\\\\x00\\\\xff\\\\xff\\\\xff\\\\x7f\\\\x00\\\\x00\\\\x00\\\\x00\\\\x08\\\\x00\\\\x01\\\\x00\\\\x08\\\\x00\\\\x00\\\\x00\u0027], \u0027bad-attr\u0027: \u0027.ifindex\u0027}\\n\\nAccept 0 since it used to be silently ignored.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/881faff9e548a7ddfb11595be7c1c649217d27db\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a552bfa16bab4ce901ee721346a28c4e483f4066\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c965a58376146dcfdda186819462e8eb3aadef3a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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