CVE-2024-56647 (GCVE-0-2024-56647)

Vulnerability from cvelistv5 – Published: 2024-12-27 15:02 – Updated: 2026-10-15 00:59
VLAI
Title
net: Fix icmp host relookup triggering ip_rt_bug
Summary
In the Linux kernel, the following vulnerability has been resolved: net: Fix icmp host relookup triggering ip_rt_bug arp link failure may trigger ip_rt_bug while xfrm enabled, call trace is: WARNING: CPU: 0 PID: 0 at net/ipv4/route.c:1241 ip_rt_bug+0x14/0x20 Modules linked in: CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.12.0-rc6-00077-g2e1b3cc9d7f7 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 RIP: 0010:ip_rt_bug+0x14/0x20 Call Trace: <IRQ> ip_send_skb+0x14/0x40 __icmp_send+0x42d/0x6a0 ipv4_link_failure+0xe2/0x1d0 arp_error_report+0x3c/0x50 neigh_invalidate+0x8d/0x100 neigh_timer_handler+0x2e1/0x330 call_timer_fn+0x21/0x120 __run_timer_base.part.0+0x1c9/0x270 run_timer_softirq+0x4c/0x80 handle_softirqs+0xac/0x280 irq_exit_rcu+0x62/0x80 sysvec_apic_timer_interrupt+0x77/0x90 The script below reproduces this scenario: ip xfrm policy add src 0.0.0.0/0 dst 0.0.0.0/0 \ dir out priority 0 ptype main flag localok icmp ip l a veth1 type veth ip a a 192.168.141.111/24 dev veth0 ip l s veth0 up ping 192.168.141.155 -c 1 icmp_route_lookup() create input routes for locally generated packets while xfrm relookup ICMP traffic.Then it will set input route (dst->out = ip_rt_bug) to skb for DESTUNREACH. For ICMP err triggered by locally generated packets, dst->dev of output route is loopback. Generally, xfrm relookup verification is not required on loopback interfaces (net.ipv4.conf.lo.disable_xfrm = 1). Skip icmp relookup for locally generated packets to fix it.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 20:00 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8b7817f3a959ed99d7443afc12f78a7e1fcc2063 , < d50981aaaefc3b04490fbc8274d37881a2b1b112 (git)
Affected: 8b7817f3a959ed99d7443afc12f78a7e1fcc2063 , < da54b3039d436227deebbc202cefea63bd318a38 (git)
Affected: 8b7817f3a959ed99d7443afc12f78a7e1fcc2063 , < 9545011e7b2a8fc0cbd6e387a09f12cd41d7d82f (git)
Affected: 8b7817f3a959ed99d7443afc12f78a7e1fcc2063 , < c44daa7e3c73229f7ac74985acb8c7fb909c4e0a (git)
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Linux Linux Affected: 2.6.25
Unaffected: 0 , < 2.6.25 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.5 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: Fix icmp host relookup triggering ip_rt_bug arp link failure may trigger ip_rt_bug while xfrm enabled, call trace is: ADVERTENCIA: CPU: 0 PID: 0 en net/ipv4/route.c:1241 ip_rt_bug+0x14/0x20 M\u00f3dulos vinculados en: CPU: 0 UID: 0 PID: 0 Comm: swapper/0 No contaminado 6.12.0-rc6-00077-g2e1b3cc9d7f7 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 01/04/2014 RIP: 0010:ip_rt_bug+0x14/0x20 Seguimiento de llamadas:  ip_send_skb+0x14/0x40 __icmp_send+0x42d/0x6a0 error de enlace ipv4+0xe2/0x1d0 informe de error arp+0x3c/0x50 invalidaci\u00f3n vecinal+0x8d/0x100 controlador de temporizador vecinal+0x2e1/0x330 funci\u00f3n de temporizador de llamada+0x21/0x120 __base de temporizador de ejecuci\u00f3n.parte.0+0x1c9/0x270 temporizador de ejecuci\u00f3n softirq+0x4c/0x80 controlador de softirqs+0xac/0x280 irq_exit_rcu+0x62/0x80 sysvec_apic_timer_interrupt+0x77/0x90 El script a continuaci\u00f3n reproduce este escenario: ip xfrm policy add src 0.0.0.0/0 dst 0.0.0.0/0 \\ dir out priority 0 ptype main flag localok icmp ip la veth1 type veth ip aa 192.168.141.111/24 dev veth0 ip ls veth0 up ping 192.168.141.155 -c 1 icmp_route_lookup() crea rutas de entrada para paquetes generados localmente mientras xfrm vuelve a buscar tr\u00e1fico ICMP. Luego, establecer\u00e1 la ruta de entrada (dst-\u0026gt;out = ip_rt_bug) en skb para DESTUNREACH. Para el error ICMP activado por paquetes generados localmente, dst-\u0026gt;dev de la ruta de salida es loopback. En general, no se requiere la verificaci\u00f3n de reb\u00fasqueda de xfrm en interfaces de bucle invertido (net.ipv4.conf.lo.disable_xfrm = 1). Omita la reb\u00fasqueda de ICMP para paquetes generados localmente para solucionarlo."
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        "id": "CVE-2024-56647",
        "lastModified": "2026-10-15T02:17:08.380",
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                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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                "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",
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              "impactScore": 3.6,
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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                "timestamp": "2025-10-01T20:00:32.629636Z",
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        "published": "2024-12-27T15:15:24.467",
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            "tags": [
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    },
    "redhat_vex": {
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      "current_release_date": "2026-10-30T00:56:32+00:00",
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      "product_status:known_affected": "90",
      "product_status:known_not_affected": "77",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: Fix icmp host relookup triggering ip_rt_bug",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56647.json",
      "version": "3"
    },
    "vulnrichment": {
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                "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
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                  "version": "3.1"
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              },
              {
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                    "id": "CVE-2024-56647",
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                      },
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              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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            {
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              "product": "Linux",
              "programFiles": [
                "net/ipv4/icmp.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
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                  "status": "affected",
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              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                },
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                  "versionType": "original_commit_for_fix"
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                      "vulnerable": true
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: Fix icmp host relookup triggering ip_rt_bug\n\narp link failure may trigger ip_rt_bug while xfrm enabled, call trace is:\n\nWARNING: CPU: 0 PID: 0 at net/ipv4/route.c:1241 ip_rt_bug+0x14/0x20\nModules linked in:\nCPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.12.0-rc6-00077-g2e1b3cc9d7f7\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996),\nBIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\nRIP: 0010:ip_rt_bug+0x14/0x20\nCall Trace:\n \u003cIRQ\u003e\n ip_send_skb+0x14/0x40\n __icmp_send+0x42d/0x6a0\n ipv4_link_failure+0xe2/0x1d0\n arp_error_report+0x3c/0x50\n neigh_invalidate+0x8d/0x100\n neigh_timer_handler+0x2e1/0x330\n call_timer_fn+0x21/0x120\n __run_timer_base.part.0+0x1c9/0x270\n run_timer_softirq+0x4c/0x80\n handle_softirqs+0xac/0x280\n irq_exit_rcu+0x62/0x80\n sysvec_apic_timer_interrupt+0x77/0x90\n\nThe script below reproduces this scenario:\nip xfrm policy add src 0.0.0.0/0 dst 0.0.0.0/0 \\\n\tdir out priority 0 ptype main flag localok icmp\nip l a veth1 type veth\nip a a 192.168.141.111/24 dev veth0\nip l s veth0 up\nping 192.168.141.155 -c 1\n\nicmp_route_lookup() create input routes for locally generated packets\nwhile xfrm relookup ICMP traffic.Then it will set input route\n(dst-\u003eout = ip_rt_bug) to skb for DESTUNREACH.\n\nFor ICMP err triggered by locally generated packets, dst-\u003edev of output\nroute is loopback. Generally, xfrm relookup verification is not required\non loopback interfaces (net.ipv4.conf.lo.disable_xfrm = 1).\n\nSkip icmp relookup for locally generated packets to fix it."
            }
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      "cveMetadata": {
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        "assignerShortName": "Linux",
        "cveId": "CVE-2024-56647",
        "datePublished": "2024-12-27T15:02:47.969Z",
        "dateReserved": "2024-12-27T15:00:39.840Z",
        "dateUpdated": "2026-10-15T00:59:58.769Z",
        "state": "PUBLISHED"
      },
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      "dataVersion": "5.2"
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  }
}



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