CVE-2026-23304 (GCVE-0-2026-23304)
Vulnerability from cvelistv5 – Published: 2026-03-25 10:26 – Updated: 2026-09-08 08:45
VLAI
EPSS
VEX
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)
Assigner
References
10 references
Impacted products
8 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) |
guessed | |
| 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 | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed |
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"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
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{
"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": {
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{
"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"
}
]
},
"published": "2026-03-25T11:16:26.180",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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"url": "https://git.kernel.org/stable/c/0b5a7826020706057cc5a9d9009e667027f221ee"
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"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "nvd@nist.gov",
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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"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.
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