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CVE-2026-43416

Estado: AnalizadaMedia (5.5)—

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

powerpc, perf: Check that current->mm is alive before getting user callchain

It may happen that mm is already released, which leads to kernel panic. This adds the NULL check for current->mm, similarly to commit 20afc60f892d ("x86, perf: Check that current->mm is alive before getting user callchain").

I was getting this panic when running a profiling BPF program (profile.py from bcc-tools):

In addition, move storing the top-level stack entry to generic perf_callchain_user to make sure the top-evel entry is always captured, even if current->mm is NULL.

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[Maddy: fixed message to avoid checkpatch format style error]

Detalles técnicos trazas, registros y código del informe original
    [26215.051935] Kernel attempted to read user page (588) - exploit attempt? (uid: 0)
    [26215.051950] BUG: Kernel NULL pointer dereference on read at 0x00000588
    [26215.051952] Faulting instruction address: 0xc00000000020fac0
    [26215.051957] Oops: Kernel access of bad area, sig: 11 [#1]
    [...]
    [26215.052049] Call Trace:
    [26215.052050] [c000000061da6d30] [c00000000020fc10] perf_callchain_user_64+0x2d0/0x490 (unreliable)
    [26215.052054] [c000000061da6dc0] [c00000000020f92c] perf_callchain_user+0x1c/0x30
    [26215.052057] [c000000061da6de0] [c0000000005ab2a0] get_perf_callchain+0x100/0x360
    [26215.052063] [c000000061da6e70] [c000000000573bc8] bpf_get_stackid+0x88/0xf0
    [26215.052067] [c000000061da6ea0] [c008000000042258] bpf_prog_16d4ab9ab662f669_do_perf_event+0xf8/0x274
    [...]

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)

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{
  "id": "CVE-2026-43416",
  "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": [
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      "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": "20002ded4d937ca87aca6253b874920a96a763c4",
              "lessThan": "98074e16742ae87fb82e234b419783c5ffc9baea",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "20002ded4d937ca87aca6253b874920a96a763c4",
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              "versionType": "git"
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            {
              "status": "affected",
              "version": "20002ded4d937ca87aca6253b874920a96a763c4",
              "lessThan": "e9bbfb4bfa86c6b5515b868d6982ac60505d7e39",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "arch/powerpc/perf/callchain.c",
            "arch/powerpc/perf/callchain_32.c",
            "arch/powerpc/perf/callchain_64.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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              "status": "affected",
              "version": "2.6.32"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.32",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.19",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19.9",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "arch/powerpc/perf/callchain.c",
            "arch/powerpc/perf/callchain_32.c",
            "arch/powerpc/perf/callchain_64.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-05-08T15:16:53.597",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/7e5f60b8cfc02a2b23a40a5f5fd2fa81d010e737",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/98074e16742ae87fb82e234b419783c5ffc9baea",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e9bbfb4bfa86c6b5515b868d6982ac60505d7e39",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc, perf: Check that current->mm is alive before getting user callchain\n\nIt may happen that mm is already released, which leads to kernel panic.\nThis adds the NULL check for current->mm, similarly to\ncommit 20afc60f892d (\"x86, perf: Check that current->mm is alive before getting user callchain\").\n\nI was getting this panic when running a profiling BPF program\n(profile.py from bcc-tools):\n\n    [26215.051935] Kernel attempted to read user page (588) - exploit attempt? (uid: 0)\n    [26215.051950] BUG: Kernel NULL pointer dereference on read at 0x00000588\n    [26215.051952] Faulting instruction address: 0xc00000000020fac0\n    [26215.051957] Oops: Kernel access of bad area, sig: 11 [#1]\n    [...]\n    [26215.052049] Call Trace:\n    [26215.052050] [c000000061da6d30] [c00000000020fc10] perf_callchain_user_64+0x2d0/0x490 (unreliable)\n    [26215.052054] [c000000061da6dc0] [c00000000020f92c] perf_callchain_user+0x1c/0x30\n    [26215.052057] [c000000061da6de0] [c0000000005ab2a0] get_perf_callchain+0x100/0x360\n    [26215.052063] [c000000061da6e70] [c000000000573bc8] bpf_get_stackid+0x88/0xf0\n    [26215.052067] [c000000061da6ea0] [c008000000042258] bpf_prog_16d4ab9ab662f669_do_perf_event+0xf8/0x274\n    [...]\n\nIn addition, move storing the top-level stack entry to generic\nperf_callchain_user to make sure the top-evel entry is always captured,\neven if current->mm is NULL.\n\n[Maddy: fixed message to avoid checkpatch format style error]"
    }
  ],
  "lastModified": "2026-06-17T10:49:33.417",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "96AC6DB0-3EDB-4183-8F29-8EC47393B50E",
              "versionEndExcluding": "6.18.19",
              "versionStartIncluding": "2.6.32"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E825E7C3-FEAC-4FD3-8A81-78D7387948C9",
              "versionEndExcluding": "6.19.9",
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            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"
            },
            {
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              "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"
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          "operator": "OR"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}