Vulnerability-Lookup

FKIE_CVE-2025-71128

Vulnerability from fkie_nvd - Published: 2026-01-14 15:16 - Updated: 2026-03-25 18:51

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: erspan: Initialize options_len before referencing options. The struct ip_tunnel_info has a flexible array member named options that is protected by a counted_by(options_len) attribute. The compiler will use this information to enforce runtime bounds checking deployed by FORTIFY_SOURCE string helpers. As laid out in the GCC documentation, the counter must be initialized before the first reference to the flexible array member. After scanning through the files that use struct ip_tunnel_info and also refer to options or options_len, it appears the normal case is to use the ip_tunnel_info_opts_set() helper. Said helper would initialize options_len properly before copying data into options, however in the GRE ERSPAN code a partial update is done, preventing the use of the helper function. Before this change the handling of ERSPAN traffic in GRE tunnels would cause a kernel panic when the kernel is compiled with GCC 15+ and having FORTIFY_SOURCE configured: memcpy: detected buffer overflow: 4 byte write of buffer size 0 Call Trace: <IRQ> __fortify_panic+0xd/0xf erspan_rcv.cold+0x68/0x83 ? ip_route_input_slow+0x816/0x9d0 gre_rcv+0x1b2/0x1c0 gre_rcv+0x8e/0x100 ? raw_v4_input+0x2a0/0x2b0 ip_protocol_deliver_rcu+0x1ea/0x210 ip_local_deliver_finish+0x86/0x110 ip_local_deliver+0x65/0x110 ? ip_rcv_finish_core+0xd6/0x360 ip_rcv+0x186/0x1a0 Reported-at: https://launchpad.net/bugs/2129580

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/35ddf66c65eff93fff91406756ba273600bf61a3	Patch
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b282b2a9eed848587c1348abdd5d83fa346a2743	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	6.15
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "DD0A1B05-C008-4639-A2E7-32E5D447EA98",
              "versionEndExcluding": "6.18.4",
              "versionStartIncluding": "6.15.1",
              "vulnerable": true
            },
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              "matchCriteriaId": "A1ECC65A-EE37-4479-8E99-4BB68A22A31F",
              "vulnerable": true
            },
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              "matchCriteriaId": "F71D92C0-C023-48BD-B3B6-70B638EEE298",
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              "matchCriteriaId": "13580667-0A98-40CC-B29F-D12790B91BDB",
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerspan: Initialize options_len before referencing options.\n\nThe struct ip_tunnel_info has a flexible array member named\noptions that is protected by a counted_by(options_len)\nattribute.\n\nThe compiler will use this information to enforce runtime bounds\nchecking deployed by FORTIFY_SOURCE string helpers.\n\nAs laid out in the GCC documentation, the counter must be\ninitialized before the first reference to the flexible array\nmember.\n\nAfter scanning through the files that use struct ip_tunnel_info\nand also refer to options or options_len, it appears the normal\ncase is to use the ip_tunnel_info_opts_set() helper.\n\nSaid helper would initialize options_len properly before copying\ndata into options, however in the GRE ERSPAN code a partial\nupdate is done, preventing the use of the helper function.\n\nBefore this change the handling of ERSPAN traffic in GRE tunnels\nwould cause a kernel panic when the kernel is compiled with\nGCC 15+ and having FORTIFY_SOURCE configured:\n\nmemcpy: detected buffer overflow: 4 byte write of buffer size 0\n\nCall Trace:\n \u003cIRQ\u003e\n __fortify_panic+0xd/0xf\n erspan_rcv.cold+0x68/0x83\n ? ip_route_input_slow+0x816/0x9d0\n gre_rcv+0x1b2/0x1c0\n gre_rcv+0x8e/0x100\n ? raw_v4_input+0x2a0/0x2b0\n ip_protocol_deliver_rcu+0x1ea/0x210\n ip_local_deliver_finish+0x86/0x110\n ip_local_deliver+0x65/0x110\n ? ip_rcv_finish_core+0xd6/0x360\n ip_rcv+0x186/0x1a0\n\nReported-at: https://launchpad.net/bugs/2129580"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nerspan: Inicializar options_len antes de referenciar options.\n\nLa struct ip_tunnel_info tiene un miembro de array flexible llamado options que est\u00e1 protegido por un atributo counted_by(options_len).\n\nEl compilador usar\u00e1 esta informaci\u00f3n para aplicar la comprobaci\u00f3n de l\u00edmites en tiempo de ejecuci\u00f3n implementada por los ayudantes de cadena de FORTIFY_SOURCE.\n\nComo se establece en la documentaci\u00f3n de GCC, el contador debe ser inicializado antes de la primera referencia al miembro de array flexible.\n\nDespu\u00e9s de escanear los archivos que usan la struct ip_tunnel_info y tambi\u00e9n se refieren a options o options_len, parece que el caso normal es usar el ayudante ip_tunnel_info_opts_set().\n\nDicho ayudante inicializar\u00eda options_len correctamente antes de copiar datos en options, sin embargo, en el c\u00f3digo GRE ERSPAN se realiza una actualizaci\u00f3n parcial, impidiendo el uso de la funci\u00f3n ayudante.\n\nAntes de este cambio, el manejo del tr\u00e1fico ERSPAN en t\u00faneles GRE causar\u00eda un p\u00e1nico del kernel cuando el kernel es compilado con GCC 15+ y teniendo FORTIFY_SOURCE configurado:\n\nmemcpy: desbordamiento de b\u00fafer detectado: escritura de 4 bytes en un b\u00fafer de tama\u00f1o 0\n\nTraza de Llamada:\n \n __fortify_panic+0xd/0xf\n erspan_rcv.cold+0x68/0x83\n ? ip_route_input_slow+0x816/0x9d0\n gre_rcv+0x1b2/0x1c0\n gre_rcv+0x8e/0x100\n ? raw_v4_input+0x2a0/0x2b0\n ip_protocol_deliver_rcu+0x1ea/0x210\n ip_local_deliver_finish+0x86/0x110\n ip_local_deliver+0x65/0x110\n ? ip_rcv_finish_core+0xd6/0x360\n ip_rcv+0x186/0x1a0\n\nReportado en: https://launchpad.net/bugs/2129580"
    }
  ],
  "id": "CVE-2025-71128",
  "lastModified": "2026-03-25T18:51:56.957",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2026-01-14T15:16:02.547",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "value": "NVD-CWE-noinfo"
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      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2025-71128 (GCVE-0-2025-71128)

Vulnerability from cvelistv5 – Published: 2026-01-14 15:07 – Updated: 2026-05-11 21:55

Title

erspan: Initialize options_len before referencing options.

Summary

Severity

No CVSS data available.

Assigner

Linux

References

2 references

URL	Tags
https://git.kernel.org/stable/c/b282b2a9eed848587…
https://git.kernel.org/stable/c/35ddf66c65eff93ff…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: bb5e62f2d547c4de6d1b144cbce2373a76c33f18 , < b282b2a9eed848587c1348abdd5d83fa346a2743 (git) Affected: bb5e62f2d547c4de6d1b144cbce2373a76c33f18 , < 35ddf66c65eff93fff91406756ba273600bf61a3 (git)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 6.18.4 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/ip_gre.c",
            "net/ipv6/ip6_gre.c"
          ],
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          "versions": [
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              "versionType": "git"
            }
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          "programFiles": [
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          ],
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "version": "6.18.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2025-71128

CVE-2025-71128 (GCVE-0-2025-71128)

Tags

Sightings

Nomenclature