{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38568",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38568"
  ],
  "published": "2025-08-19T17:19:12Z",
  "summary": "net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: mqprio: fix stack out-of-bounds write in tc entry parsing\n\nTCA_MQPRIO_TC_ENTRY_INDEX is validated using\nNLA_POLICY_MAX(NLA_U32, TC_QOPT_MAX_QUEUE), which allows the value\nTC_QOPT_MAX_QUEUE (16). This leads to a 4-byte out-of-bounds stack\nwrite in the fp[] array, which only has room for 16 elements (0\u201315).\n\nFix this by changing the policy to allow only up to TC_QOPT_MAX_QUEUE - 1.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38568"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/39491e859fd494d0b51adc5c7d54c8a7dcf1d198"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d00e4125680f7074c4f42ce3c297336f23128e70"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/66fc2ebdd9d5dd6e5a9c7edeace5a61a0ab2cd86"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f1a9dbcb7d17bf0abb325cdc984957cfabc59693"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ffd2dc4c6c49ff4f1e5d34e454a6a55608104c17"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerability is reached only through an RTM_NEWQDISC rtnetlink message on an AF_NETLINK socket, i.e. a local syscall interface. Per kernel scoring guidance, tc/netlink qdisc configuration paths are Local.\nAC:L - A single crafted netlink message with TCA_MQPRIO_TC_ENTRY_INDEX=16 deterministically triggers the out-of-bounds write; there is no race, no memory-layout guess, and no timing dependency. The only prerequisite is a multiqueue netdev implementing ndo_setup_tc, which is true of essentially every hardware NIC, DSA user port, and mac80211 wlan interface.\nPR:L - Triggering requires CAP_NET_ADMIN in the target network namespace, which per kernel scoring guidance for tc/qdisc paths is rated Low rather than High. Realistic low-privilege holders include containers granted NET_ADMIN over a namespace holding an SR-IOV VF or passed-through NIC, and non-root TSN/network configuration daemons on automotive and industrial systems.\nUI:N - The attacker performs the entire operation themselves via a netlink socket write; no victim action, mount, or file open is needed.\nS:U - The corruption occurs on the kernel stack of the calling task and stays within the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The bug corrupts kernel stack memory beyond the fp[] array, damaging adjacent frame state such as saved registers, the canary, or the in-flight netlink attribute iterator. Such kernel memory corruption is treated as leverageable toward information disclosure, so the higher rating is taken.\nI:H - This is an out-of-bounds write into the kernel stack frame at an attacker-selected trigger point, overwriting data the attacker was never permitted to modify. Out-of-bounds writes are rated High for integrity.\nA:H - On stack-protector kernels (the default for distro, Android, and automotive builds) the write lands on the canary region, so returning from mqprio_parse_tc_entries invokes __stack_chk_fail(), which calls panic() and brings the machine down unrecoverably. Even without the stack protector, the corrupted frame state causes a kernel oops."
    }
  }
}