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CVE-2026-23304 (GCVE-0-2026-23304)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:26 – Updated: 2026-09-08 08:45
VLAI
Title
ipv6: fix NULL pointer deref in ip6_rt_get_dev_rcu()
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix NULL pointer deref in ip6_rt_get_dev_rcu() l3mdev_master_dev_rcu() can return NULL when the slave device is being un-slaved from a VRF. All other callers deal with this, but we lost the fallback to loopback in ip6_rt_pcpu_alloc() -> ip6_rt_get_dev_rcu() with commit 4832c30d5458 ("net: ipv6: put host and anycast routes on device with address"). KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f] RIP: 0010:ip6_rt_pcpu_alloc (net/ipv6/route.c:1418) Call Trace: ip6_pol_route (net/ipv6/route.c:2318) fib6_rule_lookup (net/ipv6/fib6_rules.c:115) ip6_route_output_flags (net/ipv6/route.c:2607) vrf_process_v6_outbound (drivers/net/vrf.c:437) I was tempted to rework the un-slaving code to clear the flag first and insert synchronize_rcu() before we remove the upper. But looks like the explicit fallback to loopback_dev is an established pattern. And I guess avoiding the synchronize_rcu() is nice, too.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4832c30d5458387ff2533ff66fbde26ad8bb5a2d , < d542e2ac7f9e288d49735be0775611547ca4e0ee (git)
Affected: 4832c30d5458387ff2533ff66fbde26ad8bb5a2d , < a73fe9f4ae84a239d5b2686f47a58c158aee2eb4 (git)
Affected: 4832c30d5458387ff2533ff66fbde26ad8bb5a2d , < 4a48fe59f29f673a3d042d679f26629a9c3e29d4 (git)
Affected: 4832c30d5458387ff2533ff66fbde26ad8bb5a2d , < 581800298313c9fd75e94985e6d37d21b7e35d34 (git)
Affected: 4832c30d5458387ff2533ff66fbde26ad8bb5a2d , < 3310fc11fc47387d1dd4759b0bc961643ea11c7f (git)
Affected: 4832c30d5458387ff2533ff66fbde26ad8bb5a2d , < 0b5a7826020706057cc5a9d9009e667027f221ee (git)
Affected: 4832c30d5458387ff2533ff66fbde26ad8bb5a2d , < ae88c8256547b63980770a9ea7be73a15900d27e (git)
Affected: 4832c30d5458387ff2533ff66fbde26ad8bb5a2d , < 2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a (git)
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Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.77 , ≤ 6.12.* (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix NULL pointer deref in ip6_rt_get_dev_rcu()\n\nl3mdev_master_dev_rcu() can return NULL when the slave device is being\nun-slaved from a VRF. All other callers deal with this, but we lost\nthe fallback to loopback in ip6_rt_pcpu_alloc() -\u003e ip6_rt_get_dev_rcu()\nwith commit 4832c30d5458 (\"net: ipv6: put host and anycast routes on\ndevice with address\").\n\n  KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]\n  RIP: 0010:ip6_rt_pcpu_alloc (net/ipv6/route.c:1418)\n  Call Trace:\n   ip6_pol_route (net/ipv6/route.c:2318)\n   fib6_rule_lookup (net/ipv6/fib6_rules.c:115)\n   ip6_route_output_flags (net/ipv6/route.c:2607)\n   vrf_process_v6_outbound (drivers/net/vrf.c:437)\n\nI was tempted to rework the un-slaving code to clear the flag first\nand insert synchronize_rcu() before we remove the upper. But looks like\nthe explicit fallback to loopback_dev is an established pattern.\nAnd I guess avoiding the synchronize_rcu() is nice, too."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nipv6: correcci\u00f3n de desreferencia de puntero NULL en ip6_rt_get_dev_rcu()\n\nl3mdev_master_dev_rcu() puede devolver NULL cuando el dispositivo esclavo est\u00e1 siendo desasociado de un VRF. Todos los dem\u00e1s llamadores manejan esto, pero perdimos la alternativa a loopback en ip6_rt_pcpu_alloc() -\u0026gt; ip6_rt_get_dev_rcu() con el commit 4832c30d5458 (\u0027net: ipv6: put host and anycast routes on device with address\u0027).\n\n  KASAN: desreferencia de puntero nulo en el rango [0x0000000000000108-0x000000000000010f]\n  RIP: 0010:ip6_rt_pcpu_alloc (net/ipv6/route.c:1418)\n  Traza de Llamadas:\n   ip6_pol_route (net/ipv6/route.c:2318)\n   fib6_rule_lookup (net/ipv6/fib6_rules.c:115)\n   ip6_route_output_flags (net/ipv6/route.c:2607)\n   vrf_process_v6_outbound (drivers/net/vrf.c:437)\n\nMe sent\u00ed tentado a reelaborar el c\u00f3digo de desasociaci\u00f3n para borrar la bandera primero e insertar synchronize_rcu() antes de que eliminemos el superior. Pero parece que la alternativa expl\u00edcita a loopback_dev es un patr\u00f3n establecido. Y supongo que evitar el synchronize_rcu() tambi\u00e9n es bueno."
          }
        ],
        "id": "CVE-2026-23304",
        "lastModified": "2026-07-14T13:18:29.570",
        "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"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
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        "published": "2026-03-25T11:16:26.180",
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            "tags": [
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              {
                "lang": "en",
                "value": "CWE-476"
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            "source": "nvd@nist.gov",
            "type": "Primary"
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    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:20:03+00:00",
      "cve": "CVE-2026-23304",
      "id": "CVE-2026-23304",
      "initial_release_date": "2026-03-25T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipv6: fix NULL pointer deref in ip6_rt_get_dev_rcu()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23304.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:37:18Z",
      "cve": "CVE-2026-23304",
      "id": "CVE-2026-23304",
      "initial_release_date": "2026-03-25T16:56:48Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "608",
      "product_status:known_not_affected": "153",
      "product_status:recommended": "280",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23304",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23304.json",
      "version": "35"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.