CVE-2025-68216 (GCVE-0-2025-68216)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:57 – Updated: 2026-05-11 21:48
VLAI
Title
LoongArch: BPF: Disable trampoline for kernel module function trace
Summary
In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Disable trampoline for kernel module function trace The current LoongArch BPF trampoline implementation is incompatible with tracing functions in kernel modules. This causes several severe and user-visible problems: * The `bpf_selftests/module_attach` test fails consistently. * Kernel lockup when a BPF program is attached to a module function [1]. * Critical kernel modules like WireGuard experience traffic disruption when their functions are traced with fentry [2]. Given the severity and the potential for other unknown side-effects, it is safest to disable the feature entirely for now. This patch prevents the BPF subsystem from allowing trampoline attachments to kernel module functions on LoongArch. This is a temporary mitigation until the core issues in the trampoline code for kernel module handling can be identified and fixed. [root@fedora bpf]# ./test_progs -a module_attach -v bpf_testmod.ko is already unloaded. Loading bpf_testmod.ko... Successfully loaded bpf_testmod.ko. test_module_attach:PASS:skel_open 0 nsec test_module_attach:PASS:set_attach_target 0 nsec test_module_attach:PASS:set_attach_target_explicit 0 nsec test_module_attach:PASS:skel_load 0 nsec libbpf: prog 'handle_fentry': failed to attach: -ENOTSUPP libbpf: prog 'handle_fentry': failed to auto-attach: -ENOTSUPP test_module_attach:FAIL:skel_attach skeleton attach failed: -524 Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED Successfully unloaded bpf_testmod.ko. [1]: https://lore.kernel.org/loongarch/CAK3+h2wDmpC-hP4u4pJY8T-yfKyk4yRzpu2LMO+C13FMT58oqQ@mail.gmail.com/ [2]: https://lore.kernel.org/loongarch/CAK3+h2wYcpc+OwdLDUBvg2rF9rvvyc5amfHT-KcFaK93uoELPg@mail.gmail.com/
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f9b6b41f0cf31791541cea9644ddbedb46465801 , < 44eb3849378be5f72b8be03edbacbdcd6f5eade4 (git)
Affected: f9b6b41f0cf31791541cea9644ddbedb46465801 , < 677e6123e3d24adaa252697dc89740f2ac07664e (git)
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Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.17.10 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/loongarch/net/bpf_jit.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "f9b6b41f0cf31791541cea9644ddbedb46465801",
              "versionType": "git"
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          "vendor": "Linux",
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      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.10",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: BPF: Disable trampoline for kernel module function trace\n\nThe current LoongArch BPF trampoline implementation is incompatible\nwith tracing functions in kernel modules. This causes several severe\nand user-visible problems:\n\n* The `bpf_selftests/module_attach` test fails consistently.\n* Kernel lockup when a BPF program is attached to a module function [1].\n* Critical kernel modules like WireGuard experience traffic disruption\n  when their functions are traced with fentry [2].\n\nGiven the severity and the potential for other unknown side-effects, it\nis safest to disable the feature entirely for now. This patch prevents\nthe BPF subsystem from allowing trampoline attachments to kernel module\nfunctions on LoongArch.\n\nThis is a temporary mitigation until the core issues in the trampoline\ncode for kernel module handling can be identified and fixed.\n\n[root@fedora bpf]# ./test_progs -a module_attach -v\nbpf_testmod.ko is already unloaded.\nLoading bpf_testmod.ko...\nSuccessfully loaded bpf_testmod.ko.\ntest_module_attach:PASS:skel_open 0 nsec\ntest_module_attach:PASS:set_attach_target 0 nsec\ntest_module_attach:PASS:set_attach_target_explicit 0 nsec\ntest_module_attach:PASS:skel_load 0 nsec\nlibbpf: prog \u0027handle_fentry\u0027: failed to attach: -ENOTSUPP\nlibbpf: prog \u0027handle_fentry\u0027: failed to auto-attach: -ENOTSUPP\ntest_module_attach:FAIL:skel_attach skeleton attach failed: -524\nSummary: 0/0 PASSED, 0 SKIPPED, 1 FAILED\nSuccessfully unloaded bpf_testmod.ko.\n\n[1]: https://lore.kernel.org/loongarch/CAK3+h2wDmpC-hP4u4pJY8T-yfKyk4yRzpu2LMO+C13FMT58oqQ@mail.gmail.com/\n[2]: https://lore.kernel.org/loongarch/CAK3+h2wYcpc+OwdLDUBvg2rF9rvvyc5amfHT-KcFaK93uoELPg@mail.gmail.com/"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:48:58.041Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/44eb3849378be5f72b8be03edbacbdcd6f5eade4"
        },
        {
          "url": "https://git.kernel.org/stable/c/677e6123e3d24adaa252697dc89740f2ac07664e"
        }
      ],
      "title": "LoongArch: BPF: Disable trampoline for kernel module function trace",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68216",
    "datePublished": "2025-12-16T13:57:11.303Z",
    "dateReserved": "2025-12-16T13:41:40.256Z",
    "dateUpdated": "2026-05-11T21:48:58.041Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-68216",
      "date": "2026-10-27",
      "epss": "0.00185",
      "percentile": "0.07993"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "arch/loongarch/net/bpf_jit.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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                    "status": "affected",
                    "version": "f9b6b41f0cf31791541cea9644ddbedb46465801",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "677e6123e3d24adaa252697dc89740f2ac07664e",
                    "status": "affected",
                    "version": "f9b6b41f0cf31791541cea9644ddbedb46465801",
                    "versionType": "git"
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                ]
              },
              {
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                "product": "Linux",
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                  "arch/loongarch/net/bpf_jit.c"
                ],
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                "vendor": "Linux",
                "versions": [
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                    "version": "6.17"
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              }
            ],
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          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: BPF: Disable trampoline for kernel module function trace\n\nThe current LoongArch BPF trampoline implementation is incompatible\nwith tracing functions in kernel modules. This causes several severe\nand user-visible problems:\n\n* The `bpf_selftests/module_attach` test fails consistently.\n* Kernel lockup when a BPF program is attached to a module function [1].\n* Critical kernel modules like WireGuard experience traffic disruption\n  when their functions are traced with fentry [2].\n\nGiven the severity and the potential for other unknown side-effects, it\nis safest to disable the feature entirely for now. This patch prevents\nthe BPF subsystem from allowing trampoline attachments to kernel module\nfunctions on LoongArch.\n\nThis is a temporary mitigation until the core issues in the trampoline\ncode for kernel module handling can be identified and fixed.\n\n[root@fedora bpf]# ./test_progs -a module_attach -v\nbpf_testmod.ko is already unloaded.\nLoading bpf_testmod.ko...\nSuccessfully loaded bpf_testmod.ko.\ntest_module_attach:PASS:skel_open 0 nsec\ntest_module_attach:PASS:set_attach_target 0 nsec\ntest_module_attach:PASS:set_attach_target_explicit 0 nsec\ntest_module_attach:PASS:skel_load 0 nsec\nlibbpf: prog \u0027handle_fentry\u0027: failed to attach: -ENOTSUPP\nlibbpf: prog \u0027handle_fentry\u0027: failed to auto-attach: -ENOTSUPP\ntest_module_attach:FAIL:skel_attach skeleton attach failed: -524\nSummary: 0/0 PASSED, 0 SKIPPED, 1 FAILED\nSuccessfully unloaded bpf_testmod.ko.\n\n[1]: https://lore.kernel.org/loongarch/CAK3+h2wDmpC-hP4u4pJY8T-yfKyk4yRzpu2LMO+C13FMT58oqQ@mail.gmail.com/\n[2]: https://lore.kernel.org/loongarch/CAK3+h2wYcpc+OwdLDUBvg2rF9rvvyc5amfHT-KcFaK93uoELPg@mail.gmail.com/"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nLoongArch: BPF: Deshabilitar el trampol\u00edn para el rastreo de funciones de m\u00f3dulos del kernel\n\nLa implementaci\u00f3n actual del trampol\u00edn BPF de LoongArch es incompatible con el rastreo de funciones en m\u00f3dulos del kernel. Esto causa varios problemas graves y visibles para el usuario:\n\n* La prueba \u0027bpf_selftests/module_attach\u0027 falla consistentemente.\n* Bloqueo del kernel cuando un programa BPF se adjunta a una funci\u00f3n de m\u00f3dulo [1].\n* M\u00f3dulos cr\u00edticos del kernel como WireGuard experimentan interrupci\u00f3n del tr\u00e1fico cuando sus funciones son rastreadas con fentry [2].\n\nDada la gravedad y el potencial de otros efectos secundarios desconocidos, es m\u00e1s seguro deshabilitar la caracter\u00edstica por completo por ahora. Este parche evita que el subsistema BPF permita adjuntos de trampol\u00edn a funciones de m\u00f3dulos del kernel en LoongArch.\n\nEsta es una mitigaci\u00f3n temporal hasta que los problemas centrales en el c\u00f3digo del trampol\u00edn para el manejo de m\u00f3dulos del kernel puedan ser identificados y corregidos.\n\n[root@fedora bpf]# ./test_progs -a module_attach -v\nbpf_testmod.ko ya est\u00e1 descargado.\nCargando bpf_testmod.ko...\nbpf_testmod.ko cargado exitosamente.\ntest_module_attach:PASS:skel_open 0 nsec\ntest_module_attach:PASS:set_attach_target 0 nsec\ntest_module_attach:PASS:set_attach_target_explicit 0 nsec\ntest_module_attach:PASS:skel_load 0 nsec\nlibbpf: prog \u0027handle_fentry\u0027: fall\u00f3 al adjuntar: -ENOTSUPP\nlibbpf: prog \u0027handle_fentry\u0027: fall\u00f3 al auto-adjuntar: -ENOTSUPP\ntest_module_attach:FAIL:skel_attach adjunto de esqueleto fall\u00f3: -524\nSummary: 0/0 APROBADO, 0 SALTADO, 1 FALLIDO\nbpf_testmod.ko descargado exitosamente.\n\n[1]: https://lore.kernel.org/loongarch/CAK3+h2wDmpC-hP4u4pJY8T-yfKyk4yRzpu2LMO+C13FMT58oqQ@mail.gmail.com/\n[2]: https://lore.kernel.org/loongarch/CAK3+h2wYcpc+OwdLDUBvg2rF9rvvyc5amfHT-KcFaK93uoELPg@mail.gmail.com/"
          }
        ],
        "id": "CVE-2025-68216",
        "lastModified": "2026-10-14T13:10:00.187",
        "metrics": {},
        "published": "2025-12-16T14:15:54.627",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/44eb3849378be5f72b8be03edbacbdcd6f5eade4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/677e6123e3d24adaa252697dc89740f2ac07664e"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:23:22+00:00",
      "cve": "CVE-2025-68216",
      "id": "CVE-2025-68216",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: LoongArch: BPF: Disable trampoline for kernel module function trace",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68216.json",
      "version": "3"
    }
  }
}



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