« Volver al listado

CVE-2023-54181

Estado: AplazadaSin puntuar—

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

bpf: Fix issue in verifying allow_ptr_leaks

After we converted the capabilities of our networking-bpf program from cap_sys_admin to cap_net_admin+cap_bpf, our networking-bpf program failed to start. Because it failed the bpf verifier, and the error log is "R3 pointer comparison prohibited".

A simple reproducer as follows,

Per discussion with Yonghong and Alexei [1], comparison of two packet pointers is not a pointer leak. This patch fixes it.

Our local kernel is 6.1.y and we expect this fix to be backported to 6.1.y, so stable is CCed.

Leer descripción completaMostrar menos

[1]. https://lore.kernel.org/bpf/CAADnVQ+Nmspr7Si+pxWn8zkE7hX-7s93ugwC+94aXSy4uQ9vBg@mail.gmail.com/

Detalles técnicos trazas, registros y código del informe original
SEC("cls-ingress")
int ingress(struct __sk_buff *skb)
{
	struct iphdr *iph = (void *)(long)skb->data + sizeof(struct ethhdr);

	if ((long)(iph + 1) > (long)skb->data_end)
		return TC_ACT_STOLEN;
	return TC_ACT_OK;
}

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2023-54181",
  "cveTags": [],
  "metrics": {},
  "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": "2c78ee898d8f10ae6fb2fa23a3fbaec96b1b7366",
              "lessThan": "c96c67991aac6401b4c6996093bccb704bb2ea4b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2c78ee898d8f10ae6fb2fa23a3fbaec96b1b7366",
              "lessThan": "5927f0172d2809d8fc09c1ba667280b0387e9f73",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2c78ee898d8f10ae6fb2fa23a3fbaec96b1b7366",
              "lessThan": "acfdc8b77016c8e648aadc283177546c88083dd3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2c78ee898d8f10ae6fb2fa23a3fbaec96b1b7366",
              "lessThan": "d75e30dddf73449bc2d10bb8e2f1a2c446bc67a2",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "kernel/bpf/verifier.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.8",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.1.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.4.16",
              "versionType": "semver",
              "lessThanOrEqual": "6.4.*"
            },
            {
              "status": "unaffected",
              "version": "6.5.3",
              "versionType": "semver",
              "lessThanOrEqual": "6.5.*"
            },
            {
              "status": "unaffected",
              "version": "6.6",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "kernel/bpf/verifier.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-30T13:16:06.037",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/5927f0172d2809d8fc09c1ba667280b0387e9f73",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/acfdc8b77016c8e648aadc283177546c88083dd3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c96c67991aac6401b4c6996093bccb704bb2ea4b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d75e30dddf73449bc2d10bb8e2f1a2c446bc67a2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix issue in verifying allow_ptr_leaks\n\nAfter we converted the capabilities of our networking-bpf program from\ncap_sys_admin to cap_net_admin+cap_bpf, our networking-bpf program\nfailed to start. Because it failed the bpf verifier, and the error log\nis \"R3 pointer comparison prohibited\".\n\nA simple reproducer as follows,\n\nSEC(\"cls-ingress\")\nint ingress(struct __sk_buff *skb)\n{\n\tstruct iphdr *iph = (void *)(long)skb->data + sizeof(struct ethhdr);\n\n\tif ((long)(iph + 1) > (long)skb->data_end)\n\t\treturn TC_ACT_STOLEN;\n\treturn TC_ACT_OK;\n}\n\nPer discussion with Yonghong and Alexei [1], comparison of two packet\npointers is not a pointer leak. This patch fixes it.\n\nOur local kernel is 6.1.y and we expect this fix to be backported to\n6.1.y, so stable is CCed.\n\n[1]. https://lore.kernel.org/bpf/CAADnVQ+Nmspr7Si+pxWn8zkE7hX-7s93ugwC+94aXSy4uQ9vBg@mail.gmail.com/"
    }
  ],
  "lastModified": "2026-06-17T06:46:57.203",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}