{
  "threat_severity" : "Moderate",
  "public_date" : "2025-05-01T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: net: ppp: Add bound checking for skb data on ppp_sync_txmung",
    "id" : "2363332",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2363332"
  },
  "cvss3" : {
    "cvss3_base_score" : "6.1",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-125",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nnet: ppp: Add bound checking for skb data on ppp_sync_txmung\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.\nWhen ppp_sync_txmung receives an incoming package with an empty\npayload:\n(remote) gef➤  p *(struct pppoe_hdr *) (skb->head + skb->network_header)\n$18 = {\ntype = 0x1,\nver = 0x1,\ncode = 0x0,\nsid = 0x2,\nlength = 0x0,\ntag = 0xffff8880371cdb96\n}\nfrom the skb struct (trimmed)\ntail = 0x16,\nend = 0x140,\nhead = 0xffff88803346f400 \"4\",\ndata = 0xffff88803346f416 \":\\377\",\ntruesize = 0x380,\nlen = 0x0,\ndata_len = 0x0,\nmac_len = 0xe,\nhdr_len = 0x0,\nit is not safe to access data[2].\n[pabeni@redhat.com: fixed subj typo]", "An out-of-bounds read vulnerability exists in the ppp_sync_txmunge() function in the Linux kernel's PPP subsystem. Insufficient bounds checking on incoming PPP packets may lead to a kernel crash if a packet with an empty or truncated payload is processed." ],
  "statement" : "This is rated Moderate because it involves an out-of-bounds read, not write, in the ppp_sync_txmunge() function, triggered by malformed PPP packets with insufficient linear data. While it can cause a kernel crash (DoS), exploitation is limited as PPP is not widely used or exposed in most modern systems. The affected path requires a crafted PPPoE packet and direct access to a PPP interface, reducing its overall impact and likelihood of exploitation.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2025-11-11T00:00:00Z",
    "advisory" : "RHSA-2025:20095",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.1",
    "package" : "kernel-0:6.12.0-124.8.1.el10_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2025-05-19T00:00:00Z",
    "advisory" : "RHSA-2025:7903",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-570.17.1.el9_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2025-05-19T00:00:00Z",
    "advisory" : "RHSA-2025:7903",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-570.17.1.el9_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Extended Update Support",
    "release_date" : "2025-05-28T00:00:00Z",
    "advisory" : "RHSA-2025:8248",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.4",
    "package" : "kernel-0:5.14.0-427.70.1.el9_4"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Will not fix",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Will not fix",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Will not fix",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Will not fix",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Will not fix",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Will not fix",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2025-37749\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-37749\nhttps://lore.kernel.org/linux-cve-announce/2025050136-CVE-2025-37749-0f49@gregkh/T" ],
  "name" : "CVE-2025-37749",
  "mitigation" : {
    "value" : "No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.",
    "lang" : "en:us"
  },
  "csaw" : false
}