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CVE-2026-53012 (GCVE-0-2026-53012)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-09-08 08:49
VLAI
Title
nexthop: fix IPv6 route referencing IPv4 nexthop
Summary
In the Linux kernel, the following vulnerability has been resolved: nexthop: fix IPv6 route referencing IPv4 nexthop syzbot reported a panic [1] [2]. When an IPv6 nexthop is replaced with an IPv4 nexthop, the has_v4 flag of all groups containing this nexthop is not updated. This is because nh_group_v4_update is only called when replacing AF_INET to AF_INET6, but the reverse direction (AF_INET6 to AF_INET) is missed. This allows a stale has_v4=false to bypass fib6_check_nexthop, causing IPv6 routes to be attached to groups that effectively contain only AF_INET members. Subsequent route lookups then call nexthop_fib6_nh() which returns NULL for the AF_INET member, leading to a NULL pointer dereference. Fix by calling nh_group_v4_update whenever the family changes, not just AF_INET to AF_INET6. Reproducer: # AF_INET6 blackhole ip -6 nexthop add id 1 blackhole # group with has_v4=false ip nexthop add id 100 group 1 # replace with AF_INET (no -6), has_v4 stays false ip nexthop replace id 1 blackhole # pass stale has_v4 check ip -6 route add 2001:db8::/64 nhid 100 # panic ping -6 2001:db8::1 [1] https://syzkaller.appspot.com/bug?id=e17283eb2f8dcf3dd9b47fe6f67a95f71faadad0 [2] https://syzkaller.appspot.com/bug?id=8699b6ae54c9f35837d925686208402949e12ef3
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: 7bf4796dd09984ad1612877a82d0d139c70ae27f , < ceffe81a0be92afc0cd1340bc8ca46559cce9bb4 (git)
Affected: 7bf4796dd09984ad1612877a82d0d139c70ae27f , < 9c2d6770a5f4545a307eb66979bef7656a34d621 (git)
Affected: 7bf4796dd09984ad1612877a82d0d139c70ae27f , < 6275796f22bb382f3e9aa58ed0b4ef7bdad78cb8 (git)
Affected: 7bf4796dd09984ad1612877a82d0d139c70ae27f , < aaac3bed034239e1d75732211d9b05f30b0b4f35 (git)
Affected: 7bf4796dd09984ad1612877a82d0d139c70ae27f , < ad85961004fd4bd2f31209ac4b07612c6cefb9e7 (git)
Affected: 7bf4796dd09984ad1612877a82d0d139c70ae27f , < 613c8f4a501421dd258b07ea614205d4e16ec845 (git)
Affected: 7bf4796dd09984ad1612877a82d0d139c70ae27f , < b3b7e850e1541f0520c4a12ec884255c30427ff6 (git)
Affected: 7bf4796dd09984ad1612877a82d0d139c70ae27f , < 29c95185ba32b621fbc3800fb86e7dc3edf5c2be (git)
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Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (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)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-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: V3.1.6 , < * (custom)
guessed Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-14T18:07:09+00:00",
      "cve": "CVE-2026-53012",
      "id": "CVE-2026-53012",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nexthop: fix IPv6 route referencing IPv4 nexthop",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53012.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T16:59:29Z",
      "cve": "CVE-2026-53012",
      "id": "CVE-2026-53012",
      "initial_release_date": "2026-06-26T02:13:33Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "607",
      "product_status:known_not_affected": "125",
      "product_status:recommended": "250",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53012",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53012.json",
      "version": "12"
    }
  }
}



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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.