CVE-2025-37749 (GCVE-0-2025-37749)
Vulnerability from cvelistv5
Published
2025-05-01 12:55
Modified
2025-05-26 05:20
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ppp: Add bound checking for skb data on ppp_sync_txmung Ensure we have enough data in linear buffer from skb before accessing initial bytes. This prevents potential out-of-bounds accesses when processing short packets. When ppp_sync_txmung receives an incoming package with an empty payload: (remote) gef➤ p *(struct pppoe_hdr *) (skb->head + skb->network_header) $18 = { type = 0x1, ver = 0x1, code = 0x0, sid = 0x2, length = 0x0, tag = 0xffff8880371cdb96 } from the skb struct (trimmed) tail = 0x16, end = 0x140, head = 0xffff88803346f400 "4", data = 0xffff88803346f416 ":\377", truesize = 0x380, len = 0x0, data_len = 0x0, mac_len = 0xe, hdr_len = 0x0, it is not safe to access data[2]. [pabeni@redhat.com: fixed subj typo]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1f6eb9fa87a781d5370c0de7794ae242f1a95ee5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/529401c8f12ecc35f9ea5d946d5a5596cf172b48
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6e8a6bf43cea4347121ab21bb1ed8d7bef7e732e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/99aa698dec342a07125d733e39aab4394b3b7e05
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aabc6596ffb377c4c9c8f335124b92ea282c9821
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b4c836d33ca888695b2f2665f948bc1b34fbd533
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b78f2b458f56a5a4d976c8e01c43dbf58d3ea2ca
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de5a4f0cba58625e88b7bebd88f780c8c0150997
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fbaffe8bccf148ece8ad67eb5d7aa852cabf59c8
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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   Linux Linux Version: 2.6.12
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ppp: Add bound checking for skb data on ppp_sync_txmung\n\nEnsure we have enough data in linear buffer from skb before accessing\ninitial bytes. This prevents potential out-of-bounds accesses\nwhen processing short packets.\n\nWhen ppp_sync_txmung receives an incoming package with an empty\npayload:\n(remote) gef\u27a4  p *(struct pppoe_hdr *) (skb-\u003ehead + skb-\u003enetwork_header)\n$18 = {\n\ttype = 0x1,\n\tver = 0x1,\n\tcode = 0x0,\n\tsid = 0x2,\n        length = 0x0,\n\ttag = 0xffff8880371cdb96\n}\n\nfrom the skb struct (trimmed)\n      tail = 0x16,\n      end = 0x140,\n      head = 0xffff88803346f400 \"4\",\n      data = 0xffff88803346f416 \":\\377\",\n      truesize = 0x380,\n      len = 0x0,\n      data_len = 0x0,\n      mac_len = 0xe,\n      hdr_len = 0x0,\n\nit is not safe to access data[2].\n\n[pabeni@redhat.com: fixed subj typo]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-26T05:20:04.101Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/aabc6596ffb377c4c9c8f335124b92ea282c9821"
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      ],
      "title": "net: ppp: Add bound checking for skb data on ppp_sync_txmung",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37749",
    "datePublished": "2025-05-01T12:55:55.316Z",
    "dateReserved": "2025-04-16T04:51:23.937Z",
    "dateUpdated": "2025-05-26T05:20:04.101Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-37749\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-01T13:15:53.633\",\"lastModified\":\"2025-05-02T13:53:20.943\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: ppp: Add bound checking for skb data on ppp_sync_txmung\\n\\nEnsure we have enough data in linear buffer from skb before accessing\\ninitial bytes. This prevents potential out-of-bounds accesses\\nwhen processing short packets.\\n\\nWhen ppp_sync_txmung receives an incoming package with an empty\\npayload:\\n(remote) gef\u27a4  p *(struct pppoe_hdr *) (skb-\u003ehead + skb-\u003enetwork_header)\\n$18 = {\\n\\ttype = 0x1,\\n\\tver = 0x1,\\n\\tcode = 0x0,\\n\\tsid = 0x2,\\n        length = 0x0,\\n\\ttag = 0xffff8880371cdb96\\n}\\n\\nfrom the skb struct (trimmed)\\n      tail = 0x16,\\n      end = 0x140,\\n      head = 0xffff88803346f400 \\\"4\\\",\\n      data = 0xffff88803346f416 \\\":\\\\377\\\",\\n      truesize = 0x380,\\n      len = 0x0,\\n      data_len = 0x0,\\n      mac_len = 0xe,\\n      hdr_len = 0x0,\\n\\nit is not safe to access data[2].\\n\\n[pabeni@redhat.com: fixed subj typo]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: ppp: Se ha a\u00f1adido la comprobaci\u00f3n de los l\u00edmites para datos de skb en ppp_sync_txmung. Se garantiza que haya suficientes datos en el b\u00fafer lineal de skb antes de acceder a los bytes iniciales. Esto evita posibles accesos fuera de los l\u00edmites al procesar paquetes cortos. Cuando ppp_sync_txmung recibe un paquete entrante con un payload vac\u00eda: (remoto) gef? p *(struct pppoe_hdr *) (skb-\u0026gt;head + skb-\u0026gt;network_header) $18 = { type = 0x1, ver = 0x1, code = 0x0, sid = 0x2, length = 0x0, tag = 0xffff8880371cdb96 } de la estructura skb (recortada) tail = 0x16, end = 0x140, head = 0xffff88803346f400 \\\"4\\\", data = 0xffff88803346f416 \\\":\\\\377\\\", truesize = 0x380, len = 0x0, data_len = 0x0, mac_len = 0xe, hdr_len = 0x0, no es seguro acceder a los datos[2]. [pabeni@redhat.com: error tipogr\u00e1fico corregido]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1f6eb9fa87a781d5370c0de7794ae242f1a95ee5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/529401c8f12ecc35f9ea5d946d5a5596cf172b48\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6e8a6bf43cea4347121ab21bb1ed8d7bef7e732e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/99aa698dec342a07125d733e39aab4394b3b7e05\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aabc6596ffb377c4c9c8f335124b92ea282c9821\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b4c836d33ca888695b2f2665f948bc1b34fbd533\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b78f2b458f56a5a4d976c8e01c43dbf58d3ea2ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/de5a4f0cba58625e88b7bebd88f780c8c0150997\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fbaffe8bccf148ece8ad67eb5d7aa852cabf59c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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