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CVE-2026-43201

Estado: AnalizadaMedia (5.5)—

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

APEI/GHES: ARM processor Error: don't go past allocated memory

If the BIOS generates a very small ARM Processor Error, or an incomplete one, the current logic will fail to deferrence

Add checks to avoid that. With such changes, such GHESv2 records won't cause OOPSes like this:

and similar ones while trying to access section_length on an error dump with too small size.

[ rjw: Subject tweaks ]

Detalles técnicos trazas, registros y código del informe original
	err->section_length
and
	ctx_info->size

[    1.492129] Internal error: Oops: 0000000096000005 [#1]  SMP
[    1.495449] Modules linked in:
[    1.495820] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted 6.18.0-rc1-00017-gabadcc3553dd-dirty #18 PREEMPT
[    1.496125] Hardware name: QEMU QEMU Virtual Machine, BIOS unknown 02/02/2022
[    1.496433] Workqueue: kacpi_notify acpi_os_execute_deferred
[    1.496967] pstate: 814000c5 (Nzcv daIF +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
[    1.497199] pc : log_arm_hw_error+0x5c/0x200
[    1.497380] lr : ghes_handle_arm_hw_error+0x94/0x220

0xffff8000811c5324 is in log_arm_hw_error (../drivers/ras/ras.c:75).
70		err_info = (struct cper_arm_err_info *)(err + 1);
71		ctx_info = (struct cper_arm_ctx_info *)(err_info + err->err_info_num);
72		ctx_err = (u8 *)ctx_info;
73
74		for (n = 0; n < err->context_info_num; n++) {
75			sz = sizeof(struct cper_arm_ctx_info) + ctx_info->size;
76			ctx_info = (struct cper_arm_ctx_info *)((long)ctx_info + sz);
77			ctx_len += sz;
78		}
79

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-2026-43201",
  "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": "2599ad5e33b629a78a14a463a51afa134e9c5b15",
              "lessThan": "242c652849d979d0133c315a42d9acea0ff88390",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "22b5096abc9824fb84f0bfe084f5be9f7ea5f2d9",
              "lessThan": "136093ba4161e0080088abff48273f6830a47766",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "05954511b73e748d0370549ad9dd9cd95297d97a",
              "lessThan": "db103b8bd3a4aca69b1b5fe8831a6ed75ac4b3bd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "05954511b73e748d0370549ad9dd9cd95297d97a",
              "lessThan": "87880af2d24e62a84ed19943dbdd524f097172f2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0aa7b12eaa87cd6ffa25d432d3c58986516f8b1c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.12.63",
              "lessThan": "6.12.75",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.18.2",
              "lessThan": "6.18.16",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.17.13",
              "lessThan": "6.18",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "drivers/acpi/apei/ghes.c",
            "drivers/ras/ras.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.19",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/acpi/apei/ghes.c",
            "drivers/ras/ras.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-05-06T12:16:39.223",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/136093ba4161e0080088abff48273f6830a47766",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/242c652849d979d0133c315a42d9acea0ff88390",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/87880af2d24e62a84ed19943dbdd524f097172f2",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/db103b8bd3a4aca69b1b5fe8831a6ed75ac4b3bd",
      "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\nAPEI/GHES: ARM processor Error: don't go past allocated memory\n\nIf the BIOS generates a very small ARM Processor Error, or\nan incomplete one, the current logic will fail to deferrence\n\n\terr->section_length\nand\n\tctx_info->size\n\nAdd checks to avoid that. With such changes, such GHESv2\nrecords won't cause OOPSes like this:\n\n[    1.492129] Internal error: Oops: 0000000096000005 [#1]  SMP\n[    1.495449] Modules linked in:\n[    1.495820] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted 6.18.0-rc1-00017-gabadcc3553dd-dirty #18 PREEMPT\n[    1.496125] Hardware name: QEMU QEMU Virtual Machine, BIOS unknown 02/02/2022\n[    1.496433] Workqueue: kacpi_notify acpi_os_execute_deferred\n[    1.496967] pstate: 814000c5 (Nzcv daIF +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n[    1.497199] pc : log_arm_hw_error+0x5c/0x200\n[    1.497380] lr : ghes_handle_arm_hw_error+0x94/0x220\n\n0xffff8000811c5324 is in log_arm_hw_error (../drivers/ras/ras.c:75).\n70\t\terr_info = (struct cper_arm_err_info *)(err + 1);\n71\t\tctx_info = (struct cper_arm_ctx_info *)(err_info + err->err_info_num);\n72\t\tctx_err = (u8 *)ctx_info;\n73\n74\t\tfor (n = 0; n < err->context_info_num; n++) {\n75\t\t\tsz = sizeof(struct cper_arm_ctx_info) + ctx_info->size;\n76\t\t\tctx_info = (struct cper_arm_ctx_info *)((long)ctx_info + sz);\n77\t\t\tctx_len += sz;\n78\t\t}\n79\n\nand similar ones while trying to access section_length on an\nerror dump with too small size.\n\n[ rjw: Subject tweaks ]"
    }
  ],
  "lastModified": "2026-06-17T10:49:08.563",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "542D0F20-9BF3-4A6B-8A81-50EB66AF5488",
              "versionEndExcluding": "6.12.75",
              "versionStartIncluding": "6.12.63"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2BC0F0F2-F832-46B8-8B2C-F20E038DF8FE",
              "versionEndExcluding": "6.18.16",
              "versionStartIncluding": "6.18.2"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67",
              "versionEndExcluding": "6.19.6",
              "versionStartIncluding": "6.19"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}