CVE-2026-23175

Estado: AplazadaAlta (7)—

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

net: cpsw: Execute ndo_set_rx_mode callback in a work queue

This trace occurs because vlan_for_each() is called within cpsw_ndo_set_rx_mode(), which expects the RTNL lock to be held. Since modifying vlan_for_each() to operate without the RTNL lock is not straightforward, and because ndo_set_rx_mode() is invoked both with and without the RTNL lock across different code paths, simply adding rtnl_lock() in cpsw_ndo_set_rx_mode() is not a viable solution.

To resolve this issue, we opt to execute the actual processing within a work queue, following the approach used by the icssg-prueth driver.

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Please note: To reproduce this issue, I manually reverted the changes to am335x-bone-common.dtsi from commit c477358e66a3 ("ARM: dts: am335x-bone: switch to new cpsw switch drv") in order to revert to the legacy cpsw driver.

Detalles técnicos trazas, registros y código del informe original

Commit 1767bb2d47b7 ("ipv6: mcast: Don't hold RTNL for
IPV6_ADD_MEMBERSHIP and MCAST_JOIN_GROUP.") removed the RTNL lock for
IPV6_ADD_MEMBERSHIP and MCAST_JOIN_GROUP operations. However, this
change triggered the following call trace on my BeagleBone Black board:
  WARNING: net/8021q/vlan_core.c:236 at vlan_for_each+0x120/0x124, CPU#0: rpcbind/481
  RTNL: assertion failed at net/8021q/vlan_core.c (236)
  Modules linked in:
  CPU: 0 UID: 997 PID: 481 Comm: rpcbind Not tainted 6.19.0-rc7-next-20260130-yocto-standard+ #35 PREEMPT
  Hardware name: Generic AM33XX (Flattened Device Tree)
  Call trace:
   unwind_backtrace from show_stack+0x28/0x2c
   show_stack from dump_stack_lvl+0x30/0x38
   dump_stack_lvl from __warn+0xb8/0x11c
   __warn from warn_slowpath_fmt+0x130/0x194
   warn_slowpath_fmt from vlan_for_each+0x120/0x124
   vlan_for_each from cpsw_add_mc_addr+0x54/0x98
   cpsw_add_mc_addr from __hw_addr_ref_sync_dev+0xc4/0xec
   __hw_addr_ref_sync_dev from __dev_mc_add+0x78/0x88
   __dev_mc_add from igmp6_group_added+0x84/0xec
   igmp6_group_added from __ipv6_dev_mc_inc+0x1fc/0x2f0
   __ipv6_dev_mc_inc from __ipv6_sock_mc_join+0x124/0x1b4
   __ipv6_sock_mc_join from do_ipv6_setsockopt+0x84c/0x1168
   do_ipv6_setsockopt from ipv6_setsockopt+0x88/0xc8
   ipv6_setsockopt from do_sock_setsockopt+0xe8/0x19c
   do_sock_setsockopt from __sys_setsockopt+0x84/0xac
   __sys_setsockopt from ret_fast_syscall+0x0/0x54

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.11%
Percentil entre todas las CVEs puntuadas: 1
Fecha de la puntuación: 5/10/2026

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1499.004 Application or System Exploitationimpact75 %

Vulnerabilidad local (AV:L) sin interacción (UI:N) con privilegios normales (PR:L) que causa DoS por deadlock en el kernel de Linux al invocar ndo_set_rx_mode sin RTNL lock, resultando en bloqueo de procesos.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (1)

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

Linux — Linux Kernel^AI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-23175",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1
      }
    ]
  },
  "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": "1767bb2d47b715a106287a8f963d9ec6cbab4e69",
              "lessThan": "488009aa62bb1217ea0624fd5108b79adef4e148",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1767bb2d47b715a106287a8f963d9ec6cbab4e69",
              "lessThan": "0b8c878d117319f2be34c8391a77e0f4d5c94d79",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/ti/cpsw.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.17",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.10",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/ti/cpsw.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-02-14T17:15:55.210",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0b8c878d117319f2be34c8391a77e0f4d5c94d79",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/488009aa62bb1217ea0624fd5108b79adef4e148",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: cpsw: Execute ndo_set_rx_mode callback in a work queue\n\nCommit 1767bb2d47b7 (\"ipv6: mcast: Don't hold RTNL for\nIPV6_ADD_MEMBERSHIP and MCAST_JOIN_GROUP.\") removed the RTNL lock for\nIPV6_ADD_MEMBERSHIP and MCAST_JOIN_GROUP operations. However, this\nchange triggered the following call trace on my BeagleBone Black board:\n  WARNING: net/8021q/vlan_core.c:236 at vlan_for_each+0x120/0x124, CPU#0: rpcbind/481\n  RTNL: assertion failed at net/8021q/vlan_core.c (236)\n  Modules linked in:\n  CPU: 0 UID: 997 PID: 481 Comm: rpcbind Not tainted 6.19.0-rc7-next-20260130-yocto-standard+ #35 PREEMPT\n  Hardware name: Generic AM33XX (Flattened Device Tree)\n  Call trace:\n   unwind_backtrace from show_stack+0x28/0x2c\n   show_stack from dump_stack_lvl+0x30/0x38\n   dump_stack_lvl from __warn+0xb8/0x11c\n   __warn from warn_slowpath_fmt+0x130/0x194\n   warn_slowpath_fmt from vlan_for_each+0x120/0x124\n   vlan_for_each from cpsw_add_mc_addr+0x54/0x98\n   cpsw_add_mc_addr from __hw_addr_ref_sync_dev+0xc4/0xec\n   __hw_addr_ref_sync_dev from __dev_mc_add+0x78/0x88\n   __dev_mc_add from igmp6_group_added+0x84/0xec\n   igmp6_group_added from __ipv6_dev_mc_inc+0x1fc/0x2f0\n   __ipv6_dev_mc_inc from __ipv6_sock_mc_join+0x124/0x1b4\n   __ipv6_sock_mc_join from do_ipv6_setsockopt+0x84c/0x1168\n   do_ipv6_setsockopt from ipv6_setsockopt+0x88/0xc8\n   ipv6_setsockopt from do_sock_setsockopt+0xe8/0x19c\n   do_sock_setsockopt from __sys_setsockopt+0x84/0xac\n   __sys_setsockopt from ret_fast_syscall+0x0/0x54\n\nThis trace occurs because vlan_for_each() is called within\ncpsw_ndo_set_rx_mode(), which expects the RTNL lock to be held.\nSince modifying vlan_for_each() to operate without the RTNL lock is not\nstraightforward, and because ndo_set_rx_mode() is invoked both with and\nwithout the RTNL lock across different code paths, simply adding\nrtnl_lock() in cpsw_ndo_set_rx_mode() is not a viable solution.\n\nTo resolve this issue, we opt to execute the actual processing within\na work queue, following the approach used by the icssg-prueth driver.\n\nPlease note: To reproduce this issue, I manually reverted the changes to\nam335x-bone-common.dtsi from commit c477358e66a3 (\"ARM: dts: am335x-bone:\nswitch to new cpsw switch drv\") in order to revert to the legacy cpsw\ndriver."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: cpsw: Ejecutar la devolución de llamada ndo_set_rx_mode en una cola de trabajo\n\nEl commit 1767bb2d47b7 ('ipv6: mcast: No retener RTNL para IPV6_ADD_MEMBERSHIP y MCAST_JOIN_GROUP.') eliminó el bloqueo RTNL para las operaciones IPV6_ADD_MEMBERSHIP y MCAST_JOIN_GROUP. Sin embargo, este cambio desencadenó el siguiente rastreo de llamadas en mi placa BeagleBone Black:\n  WARNING: net/8021q/vlan_core.c:236 en vlan_for_each+0x120/0x124, CPU#0: rpcbind/481\n  RTNL: aserción fallida en net/8021q/vlan_core.c (236)\n  Módulos enlazados:\n  CPU: 0 UID: 997 PID: 481 Comm: rpcbind No contaminado 6.19.0-rc7-next-20260130-yocto-standard+ #35 PREEMPT\n  Nombre del hardware: Generic AM33XX (Flattened Device Tree)\n  Rastreo de llamadas:\n   unwind_backtrace desde show_stack+0x28/0x2c\n   show_stack desde dump_stack_lvl+0x30/0x38\n   dump_stack_lvl desde __warn+0xb8/0x11c\n   __warn desde warn_slowpath_fmt+0x130/0x194\n   warn_slowpath_fmt desde vlan_for_each+0x120/0x124\n   vlan_for_each desde cpsw_add_mc_addr+0x54/0x98\n   cpsw_add_mc_addr desde __hw_addr_ref_sync_dev+0xc4/0xec\n   __hw_addr_ref_sync_dev desde __dev_mc_add+0x78/0x88\n   __dev_mc_add desde igmp6_group_added+0x84/0xec\n   igmp6_group_added desde __ipv6_dev_mc_inc+0x1fc/0x2f0\n   __ipv6_dev_mc_inc desde __ipv6_sock_mc_join+0x124/0x1b4\n   __ipv6_sock_mc_join desde do_ipv6_setsockopt+0x84c/0x1168\n   do_ipv6_setsockopt desde ipv6_setsockopt+0x88/0xc8\n   ipv6_setsockopt desde do_sock_setsockopt+0xe8/0x19c\n   do_sock_setsockopt desde __sys_setsockopt+0x84/0xac\n   __sys_setsockopt desde ret_fast_syscall+0x0/0x54\n\nEste rastreo ocurre porque se llama a vlan_for_each() dentro de cpsw_ndo_set_rx_mode(), que espera que el bloqueo RTNL esté retenido. Dado que modificar vlan_for_each() para operar sin el bloqueo RTNL no es sencillo, y debido a que ndo_set_rx_mode() se invoca tanto con como sin el bloqueo RTNL a través de diferentes rutas de código, simplemente añadir rtnl_lock() en cpsw_ndo_set_rx_mode() no es una solución viable.\n\nPara resolver este problema, optamos por ejecutar el procesamiento real dentro de una cola de trabajo, siguiendo el enfoque utilizado por el controlador icssg-prueth.\n\nTenga en cuenta: Para reproducir este problema, revertí manualmente los cambios en am335x-bone-common.dtsi del commit c477358e66a3 ('ARM: dts: am335x-bone: cambiar a nuevo controlador de switch cpsw') para revertir al controlador cpsw heredado."
    }
  ],
  "lastModified": "2026-06-17T10:21:02.460",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}