Vulnerability-Lookup

GHSA-3QGV-QJ84-5MMH

Vulnerability from github – Published: 2026-03-25 12:30 – Updated: 2026-03-25 12:30

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23304"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-25T11:16:26Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-3qgv-qj84-5mmh",
  "modified": "2026-03-25T12:30:22Z",
  "published": "2026-03-25T12:30:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23304"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0b5a7826020706057cc5a9d9009e667027f221ee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3310fc11fc47387d1dd4759b0bc961643ea11c7f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a48fe59f29f673a3d042d679f26629a9c3e29d4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/581800298313c9fd75e94985e6d37d21b7e35d34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae88c8256547b63980770a9ea7be73a15900d27e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2026-03-25 10:26 – Updated: 2026-03-25 10:26

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 ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/4a48fe59f29f673a3…
	https://git.kernel.org/stable/c/581800298313c9fd7…
	https://git.kernel.org/stable/c/3310fc11fc47387d1…
	https://git.kernel.org/stable/c/0b5a7826020706057…
	https://git.kernel.org/stable/c/ae88c8256547b6398…
	https://git.kernel.org/stable/c/2ffb4f5c2ccb2fa1c…

Impacted products

Vendor

Product

Version

Linux

Affected: 4832c30d5458387ff2533ff66fbde26ad8bb5a2d , < 4a48fe59f29f673a3d042d679f26629a9c3e29d4 (git)
Affected: 4832c30d5458387ff2533ff66fbde26ad8bb5a2d , < 581800298313c9fd75e94985e6d37d21b7e35d34 (git)
Affected: 4832c30d5458387ff2533ff66fbde26ad8bb5a2d , < 3310fc11fc47387d1dd4759b0bc961643ea11c7f (git)
Affected: 4832c30d5458387ff2533ff66fbde26ad8bb5a2d , < 0b5a7826020706057cc5a9d9009e667027f221ee (git)
Affected: 4832c30d5458387ff2533ff66fbde26ad8bb5a2d , < ae88c8256547b63980770a9ea7be73a15900d27e (git)
Affected: 4832c30d5458387ff2533ff66fbde26ad8bb5a2d , < 2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a (git)

Linux

Affected: 4.14
Unaffected: 0 , < 4.14 (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-rc3 , ≤ * (original_commit_for_fix)

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{
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        {
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.77",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.17",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0-rc3",
              "versionType": "original_commit_for_fix"
            }
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        }
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      "cpeApplicability": [
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          "url": "https://git.kernel.org/stable/c/581800298313c9fd75e94985e6d37d21b7e35d34"
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          "url": "https://git.kernel.org/stable/c/ae88c8256547b63980770a9ea7be73a15900d27e"
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    "datePublished": "2026-03-25T10:26:59.015Z",
    "dateReserved": "2026-01-13T15:37:45.993Z",
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}

Sightings

Author	Source	Type	Date

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

GHSA-3QGV-QJ84-5MMH

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

Tags

Sightings

Nomenclature