CVE-2025-21954 (GCVE-0-2025-21954)
Vulnerability from cvelistv5
Published
2025-04-01 15:46
Modified
2025-05-04 07:25
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netmem: prevent TX of unreadable skbs Currently on stable trees we have support for netmem/devmem RX but not TX. It is not safe to forward/redirect an RX unreadable netmem packet into the device's TX path, as the device may call dma-mapping APIs on dma addrs that should not be passed to it. Fix this by preventing the xmit of unreadable skbs. Tested by configuring tc redirect: sudo tc qdisc add dev eth1 ingress sudo tc filter add dev eth1 ingress protocol ip prio 1 flower ip_proto \ tcp src_ip 192.168.1.12 action mirred egress redirect dev eth1 Before, I see unreadable skbs in the driver's TX path passed to dma mapping APIs. After, I don't see unreadable skbs in the driver's TX path passed to dma mapping APIs.
References
Impacted products
Vendor Product Version
Linux Linux Version: 65249feb6b3df9e17bab5911ee56fa7b0971e231
Version: 65249feb6b3df9e17bab5911ee56fa7b0971e231
Version: 65249feb6b3df9e17bab5911ee56fa7b0971e231
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/dev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.12"
            },
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              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.20",
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            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.20",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
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                  "versionEndExcluding": "6.13.8",
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                  "versionEndExcluding": "6.14",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetmem: prevent TX of unreadable skbs\n\nCurrently on stable trees we have support for netmem/devmem RX but not\nTX. It is not safe to forward/redirect an RX unreadable netmem packet\ninto the device\u0027s TX path, as the device may call dma-mapping APIs on\ndma addrs that should not be passed to it.\n\nFix this by preventing the xmit of unreadable skbs.\n\nTested by configuring tc redirect:\n\nsudo tc qdisc add dev eth1 ingress\nsudo tc filter add dev eth1 ingress protocol ip prio 1 flower ip_proto \\\n\ttcp src_ip 192.168.1.12 action mirred egress redirect dev eth1\n\nBefore, I see unreadable skbs in the driver\u0027s TX path passed to dma\nmapping APIs.\n\nAfter, I don\u0027t see unreadable skbs in the driver\u0027s TX path passed to dma\nmapping APIs."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:25:40.966Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/454825019d2f0c59e5174ece9e713f45ad80beff"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c17c8ced25c5fbe424c7ad7ea11d33014a986b1"
        },
        {
          "url": "https://git.kernel.org/stable/c/f3600c867c99a2cc8038680ecf211089c50e7971"
        }
      ],
      "title": "netmem: prevent TX of unreadable skbs",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21954",
    "datePublished": "2025-04-01T15:46:55.226Z",
    "dateReserved": "2024-12-29T08:45:45.790Z",
    "dateUpdated": "2025-05-04T07:25:40.966Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21954\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-01T16:15:26.610\",\"lastModified\":\"2025-04-01T20:26:01.990\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetmem: prevent TX of unreadable skbs\\n\\nCurrently on stable trees we have support for netmem/devmem RX but not\\nTX. It is not safe to forward/redirect an RX unreadable netmem packet\\ninto the device\u0027s TX path, as the device may call dma-mapping APIs on\\ndma addrs that should not be passed to it.\\n\\nFix this by preventing the xmit of unreadable skbs.\\n\\nTested by configuring tc redirect:\\n\\nsudo tc qdisc add dev eth1 ingress\\nsudo tc filter add dev eth1 ingress protocol ip prio 1 flower ip_proto \\\\\\n\\ttcp src_ip 192.168.1.12 action mirred egress redirect dev eth1\\n\\nBefore, I see unreadable skbs in the driver\u0027s TX path passed to dma\\nmapping APIs.\\n\\nAfter, I don\u0027t see unreadable skbs in the driver\u0027s TX path passed to dma\\nmapping APIs.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netmem: evitar TX de skbs ilegibles Actualmente en \u00e1rboles estables tenemos soporte para netmem/devmem RX pero no TX. No es seguro reenviar/redirigir un paquete netmem ilegible RX en la ruta TX del dispositivo, ya que el dispositivo puede llamar a las API de mapeo DMA en direcciones DMA que no se le deben pasar. Arregle esto al evitar la xmit de skbs ilegibles. Probado al configurar tc redirect: sudo tc qdisc add dev eth1 ingress sudo tc filter add dev eth1 ingress protocol ip prio 1 flower ip_proto \\\\ tcp src_ip 192.168.1.12 action mirred egress redirect dev eth1 Antes, ve\u00eda skbs ilegibles en la ruta TX del controlador pasada a las API de mapeo DMA. Despu\u00e9s, no veo skbs ilegibles en la ruta TX del controlador pasada a las API de mapeo de DMA.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1c17c8ced25c5fbe424c7ad7ea11d33014a986b1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/454825019d2f0c59e5174ece9e713f45ad80beff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f3600c867c99a2cc8038680ecf211089c50e7971\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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