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CVE-2025-38568 (GCVE-0-2025-38568)

Vulnerability from cvelistv5 – Published: 2025-08-19 17:02 – Updated: 2026-08-05 12:02
VLAI
Title
net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing TCA_MQPRIO_TC_ENTRY_INDEX is validated using NLA_POLICY_MAX(NLA_U32, TC_QOPT_MAX_QUEUE), which allows the value TC_QOPT_MAX_QUEUE (16). This leads to a 4-byte out-of-bounds stack write in the fp[] array, which only has room for 16 elements (0–15). Fix this by changing the policy to allow only up to TC_QOPT_MAX_QUEUE - 1.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-10 20:41 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f62af20bed2d9e824f51cfc97ff01bc261f40e58 , < 39491e859fd494d0b51adc5c7d54c8a7dcf1d198 (git)
Affected: f62af20bed2d9e824f51cfc97ff01bc261f40e58 , < d00e4125680f7074c4f42ce3c297336f23128e70 (git)
Affected: f62af20bed2d9e824f51cfc97ff01bc261f40e58 , < 66fc2ebdd9d5dd6e5a9c7edeace5a61a0ab2cd86 (git)
Affected: f62af20bed2d9e824f51cfc97ff01bc261f40e58 , < f1a9dbcb7d17bf0abb325cdc984957cfabc59693 (git)
Affected: f62af20bed2d9e824f51cfc97ff01bc261f40e58 , < ffd2dc4c6c49ff4f1e5d34e454a6a55608104c17 (git)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.102 , ≤ 6.6.* (semver)
Unaffected: 6.12.42 , ≤ 6.12.* (semver)
Unaffected: 6.15.10 , ≤ 6.15.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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      "product_status:known_not_affected": "98",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38568.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T01:53:47Z",
      "cve": "CVE-2025-38568",
      "id": "CVE-2025-38568",
      "initial_release_date": "2025-09-12T23:26:01Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "453",
      "product_status:recommended": "555",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38568",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38568.json",
      "version": "47"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2025-38568",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-06-10T20:41:51.423653Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-06-11T17:38:48.189Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "net/sched/sch_mqprio.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
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                },
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                  "versionType": "git"
                },
                {
                  "lessThan": "f1a9dbcb7d17bf0abb325cdc984957cfabc59693",
                  "status": "affected",
                  "version": "f62af20bed2d9e824f51cfc97ff01bc261f40e58",
                  "versionType": "git"
                },
                {
                  "lessThan": "ffd2dc4c6c49ff4f1e5d34e454a6a55608104c17",
                  "status": "affected",
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            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
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              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "6.4"
                },
                {
                  "lessThan": "6.4",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.102",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.42",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.15.*",
                  "status": "unaffected",
                  "version": "6.15.10",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.16.*",
                  "status": "unaffected",
                  "version": "6.16.1",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.17",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
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                      "versionEndExcluding": "6.6.102",
                      "versionStartIncluding": "6.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.42",
                      "versionStartIncluding": "6.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.15.10",
                      "versionStartIncluding": "6.4",
                      "vulnerable": true
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                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
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          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "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."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "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\u0027s 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."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T12:02:57.480Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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          "references": [
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              "url": "https://git.kernel.org/stable/c/39491e859fd494d0b51adc5c7d54c8a7dcf1d198"
            },
            {
              "url": "https://git.kernel.org/stable/c/d00e4125680f7074c4f42ce3c297336f23128e70"
            },
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              "url": "https://git.kernel.org/stable/c/66fc2ebdd9d5dd6e5a9c7edeace5a61a0ab2cd86"
            },
            {
              "url": "https://git.kernel.org/stable/c/f1a9dbcb7d17bf0abb325cdc984957cfabc59693"
            },
            {
              "url": "https://git.kernel.org/stable/c/ffd2dc4c6c49ff4f1e5d34e454a6a55608104c17"
            }
          ],
          "title": "net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing",
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      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-38568",
        "datePublished": "2025-08-19T17:02:49.278Z",
        "dateReserved": "2025-04-16T04:51:24.025Z",
        "dateUpdated": "2026-08-05T12:02:57.480Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.