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CVE-2025-38033

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

x86/Kconfig: make CFI_AUTO_DEFAULT depend on !RUST or Rust >= 1.88

Calling core::fmt::write() from rust code while FineIBT is enabled results in a kernel panic:

This happens because core::fmt::write() calls core::fmt::rt::Argument::fmt(), which currently has CFI disabled:

library/core/src/fmt/rt.rs: 171 // FIXME: Transmuting formatter in new and indirectly branching to/calling 172 // it here is an explicit CFI violation. 173 #[allow(inline_no_sanitize)] 174 #[no_sanitize(cfi, kcfi)] 175 #[inline] 176 pub(super) unsafe fn fmt(&self, f: &mut Formatter<'_>) -> Result {

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This causes a Control Protection exception, because FineIBT has sealed off the original function's endbr64.

This makes rust currently incompatible with FineIBT. Add a Kconfig dependency that prevents FineIBT from getting turned on by default if rust is enabled.

[ Reduced splat. - Miguel ]

Detalles técnicos trazas, registros y código del informe original
[ 4614.199779] kernel BUG at arch/x86/kernel/cet.c:132!
[ 4614.205343] Oops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
[ 4614.211781] CPU: 2 UID: 0 PID: 6057 Comm: dmabuf_dump Tainted: G     U     O       6.12.17-android16-0-g6ab38c534a43 #1 9da040f27673ec3945e23b998a0f8bd64c846599
[ 4614.227832] Tainted: [U]=USER, [O]=OOT_MODULE
[ 4614.241247] RIP: 0010:do_kernel_cp_fault+0xea/0xf0
...
[ 4614.398144] RIP: 0010:_RNvXs5_NtNtNtCs3o2tGsuHyou_4core3fmt3num3impyNtB9_7Display3fmt+0x0/0x20
[ 4614.407792] Code: 48 f7 df 48 0f 48 f9 48 89 f2 89 c6 5d e9 18 fd ff ff 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 41 81 ea 14 61 af 2c 74 03 0f 0b 90 <66> 0f 1f 00 55 48 89 e5 48 89 f2 48 8b 3f be 01 00 00 00 5d e9 e7
[ 4614.428775] RSP: 0018:ffffb95acfa4ba68 EFLAGS: 00010246
[ 4614.434609] RAX: 0000000000000000 RBX: 0000000000000010 RCX: 0000000000000000
[ 4614.442587] RDX: 0000000000000007 RSI: ffffb95acfa4ba70 RDI: ffffb95acfa4bc88
[ 4614.450557] RBP: ffffb95acfa4bae0 R08: ffff0a00ffffff05 R09: 0000000000000070
[ 4614.458527] R10: 0000000000000000 R11: ffffffffab67eaf0 R12: ffffb95acfa4bcc8
[ 4614.466493] R13: ffffffffac5d50f0 R14: 0000000000000000 R15: 0000000000000000
[ 4614.474473]  ? __cfi__RNvXs5_NtNtNtCs3o2tGsuHyou_4core3fmt3num3impyNtB9_7Display3fmt+0x10/0x10
[ 4614.484118]  ? _RNvNtCs3o2tGsuHyou_4core3fmt5write+0x1d2/0x250

[ Rust 1.88.0 (scheduled for 2025-06-26) should have this fixed [1],
  and thus we relaxed the condition with Rust >= 1.88.

  When `objtool` lands checking for this with e.g. [2], the plan is
  to ideally run that in upstream Rust's CI to prevent regressions
  early [3], since we do not control `core`'s source code.

  Alice tested the Rust PR backported to an older compiler.

  Peter would like that Rust provides a stable `core` which can be
  pulled into the kernel: "Relying on that much out of tree code is
  'unfortunate'".

    - Miguel ]

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2025-38033",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "d6f635bcaca8d38dfa47ee20658705f9eff156b5",
              "lessThan": "5a8d073d87da4ad1496b35adaee5719e94665d81",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d6f635bcaca8d38dfa47ee20658705f9eff156b5",
              "lessThan": "6b9956d09382bcbd5fd260c4b60ec48680a4cffb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d6f635bcaca8d38dfa47ee20658705f9eff156b5",
              "lessThan": "5595c31c370957aabe739ac3996aedba8267603f",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "arch/x86/Kconfig"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.11",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.31",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.14.9",
              "versionType": "semver",
              "lessThanOrEqual": "6.14.*"
            },
            {
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "arch/x86/Kconfig"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-06-18T10:15:35.470",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/5595c31c370957aabe739ac3996aedba8267603f",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5a8d073d87da4ad1496b35adaee5719e94665d81",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6b9956d09382bcbd5fd260c4b60ec48680a4cffb",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/Kconfig: make CFI_AUTO_DEFAULT depend on !RUST or Rust >= 1.88\n\nCalling core::fmt::write() from rust code while FineIBT is enabled\nresults in a kernel panic:\n\n[ 4614.199779] kernel BUG at arch/x86/kernel/cet.c:132!\n[ 4614.205343] Oops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI\n[ 4614.211781] CPU: 2 UID: 0 PID: 6057 Comm: dmabuf_dump Tainted: G     U     O       6.12.17-android16-0-g6ab38c534a43 #1 9da040f27673ec3945e23b998a0f8bd64c846599\n[ 4614.227832] Tainted: [U]=USER, [O]=OOT_MODULE\n[ 4614.241247] RIP: 0010:do_kernel_cp_fault+0xea/0xf0\n...\n[ 4614.398144] RIP: 0010:_RNvXs5_NtNtNtCs3o2tGsuHyou_4core3fmt3num3impyNtB9_7Display3fmt+0x0/0x20\n[ 4614.407792] Code: 48 f7 df 48 0f 48 f9 48 89 f2 89 c6 5d e9 18 fd ff ff 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 41 81 ea 14 61 af 2c 74 03 0f 0b 90 <66> 0f 1f 00 55 48 89 e5 48 89 f2 48 8b 3f be 01 00 00 00 5d e9 e7\n[ 4614.428775] RSP: 0018:ffffb95acfa4ba68 EFLAGS: 00010246\n[ 4614.434609] RAX: 0000000000000000 RBX: 0000000000000010 RCX: 0000000000000000\n[ 4614.442587] RDX: 0000000000000007 RSI: ffffb95acfa4ba70 RDI: ffffb95acfa4bc88\n[ 4614.450557] RBP: ffffb95acfa4bae0 R08: ffff0a00ffffff05 R09: 0000000000000070\n[ 4614.458527] R10: 0000000000000000 R11: ffffffffab67eaf0 R12: ffffb95acfa4bcc8\n[ 4614.466493] R13: ffffffffac5d50f0 R14: 0000000000000000 R15: 0000000000000000\n[ 4614.474473]  ? __cfi__RNvXs5_NtNtNtCs3o2tGsuHyou_4core3fmt3num3impyNtB9_7Display3fmt+0x10/0x10\n[ 4614.484118]  ? _RNvNtCs3o2tGsuHyou_4core3fmt5write+0x1d2/0x250\n\nThis happens because core::fmt::write() calls\ncore::fmt::rt::Argument::fmt(), which currently has CFI disabled:\n\nlibrary/core/src/fmt/rt.rs:\n171     // FIXME: Transmuting formatter in new and indirectly branching to/calling\n172     // it here is an explicit CFI violation.\n173     #[allow(inline_no_sanitize)]\n174     #[no_sanitize(cfi, kcfi)]\n175     #[inline]\n176     pub(super) unsafe fn fmt(&self, f: &mut Formatter<'_>) -> Result {\n\nThis causes a Control Protection exception, because FineIBT has sealed\noff the original function's endbr64.\n\nThis makes rust currently incompatible with FineIBT. Add a Kconfig\ndependency that prevents FineIBT from getting turned on by default\nif rust is enabled.\n\n[ Rust 1.88.0 (scheduled for 2025-06-26) should have this fixed [1],\n  and thus we relaxed the condition with Rust >= 1.88.\n\n  When `objtool` lands checking for this with e.g. [2], the plan is\n  to ideally run that in upstream Rust's CI to prevent regressions\n  early [3], since we do not control `core`'s source code.\n\n  Alice tested the Rust PR backported to an older compiler.\n\n  Peter would like that Rust provides a stable `core` which can be\n  pulled into the kernel: \"Relying on that much out of tree code is\n  'unfortunate'\".\n\n    - Miguel ]\n\n[ Reduced splat. - Miguel ]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: x86/Kconfig: hacer que CFI_AUTO_DEFAULT dependa de !RUST o Rust &gt;= 1.88 Llamar a core::fmt::write() desde el código rust mientras FineIBT está habilitado da como resultado un pánico del kernel: [ 4614.199779] ¡ERROR del kernel en arch/x86/kernel/cet.c:132! [ 4614.205343] Ups: código de operación no válido: 0000 [#1] PREEMPT SMP NOPTI [ 4614.211781] CPU: 2 UID: 0 PID: 6057 Comm: dmabuf_dump Contaminado: GUO 6.12.17-android16-0-g6ab38c534a43 #1 9da040f27673ec3945e23b998a0f8bd64c846599 [ 4614.227832] Contaminado: [U]=USUARIO, [O]=OOT_MÓDULO [ 4614.241247] RIP: 0010:do_kernel_cp_fault+0xea/0xf0 ... [ 4614.398144] RIP: 0010:_RNvXs5_NtNtNtCs3o2tGsuHyou_4core3fmt3num3impyNtB9_7Display3fmt+0x0/0x20 [ 4614.407792] Código: 48 f7 gl 48 0f 48 f9 48 89 f2 89 c6 5d e9 18 fd ff ff 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 41 81 ea 14 61 af 2c 74 03 0f 0b 90 &lt;66&gt; 0f 1f 00 55 48 89 e5 48 89 f2 48 8b 3f be 01 00 00 00 5d e9 e7 [ 4614.428775] RSP: 0018:ffffb95acfa4ba68 EFLAGS: 00010246 [ 4614.434609] RAX: 000000000000000 RBX: 0000000000000010 RCX: 0000000000000000 [ 4614.442587] RDX: 0000000000000007 RSI: ffffb95acfa4ba70 RDI: ffffb95acfa4bc88 [ 4614.450557] RBP: ffffb95acfa4bae0 R08: ffff0a00ffffff05 R09: 0000000000000070 [ 4614.458527] R10: 0000000000000000 R11: ffffffffab67eaf0 R12: ffffb95acfa4bcc8 [ 4614.466493] R13: ffffffffac5d50f0 R14: 0000000000000000 R15: 0000000000000000 [ 4614.474473] ? __cfi__RNvXs5_NtNtNtCs3o2tGsuHyou_4core3fmt3num3impyNtB9_7Display3fmt+0x10/0x10 [ 4614.484118] ? _RNvNtCs3o2tGsuHyou_4core3fmt5write+0x1d2/0x250 Esto sucede porque core::fmt::write() llama a core::fmt::rt::Argument::fmt(), que actualmente tiene CFI deshabilitado: library/core/src/fmt/rt.rs: 171 // FIXME: Transmutando el formateador en new y ramificando indirectamente a/llamando a 172 // aquí es una violación explícita de CFI. 173 #[allow(inline_no_sanitize)] 174 #[no_sanitize(cfi, kcfi)] 175 #[inline] 176 pub(super) unsafe fn fmt(&amp;self, f: &amp;mut Formatter&lt;'_&gt;) -&gt; Result { Esto causa una excepción de Protección de Control, porque FineIBT ha sellado el endbr64 de la función original. Esto hace que rust actualmente sea incompatible con FineIBT. Agregue una dependencia de Kconfig que evite que FineIBT se active de manera predeterminada si Rust está habilitado. [ Rust 1.88.0 (programado para el 26/06/2025) debería tener esto solucionado [1], y por lo tanto relajamos la condición con Rust &gt;= 1.88. Cuando `objtool` aterrice verificando esto con, por ejemplo, [2], el plan es ejecutarlo idealmente en la CI de Rust ascendente para evitar regresiones tempranas [3], ya que no controlamos el código fuente de `core`. Alice probó el PR de Rust retroportado a un compilador más antiguo. A Peter le gustaría que Rust proporcionara un núcleo estable que se pueda integrar en el kernel: \"Depender de tanto código fuera del árbol es 'desafortunado'\". - Miguel ] [Menudas palabras. - Miguel ]"
    }
  ],
  "lastModified": "2026-06-17T09:15:55.127",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "27CC85D7-C33B-4ADC-85D4-430F0FC3871E",
              "versionEndExcluding": "6.12.31",
              "versionStartIncluding": "6.11"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A9B72DD1-715C-4101-A720-1C8D70044C06",
              "versionEndExcluding": "6.14.9",
              "versionStartIncluding": "6.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8D465631-2980-487A-8E65-40AE2B9F8ED1"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4C9D071F-B28E-46EC-AC61-22B913390211"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "13FC0DDE-E513-465E-9E81-515702D49B74"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8C7B5B0E-4EEB-48F5-B4CF-0935A7633845"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc5:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2D240580-3048-49B2-9E27-F115A9DF8224"
            }
          ],
          "operator": "OR"
        }
      ]
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  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}