{"cve":{"cve_id":"CVE-2026-53012","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":null,"epss_percentile":null,"epss_as_of":null,"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnexthop: fix IPv6 route referencing IPv4 nexthop\n\nsyzbot reported a panic [1] [2].\n\nWhen an IPv6 nexthop is replaced with an IPv4 nexthop, the has_v4 flag\nof all groups containing this nexthop is not updated. This is because\nnh_group_v4_update is only called when replacing AF_INET to AF_INET6,\nbut the reverse direction (AF_INET6 to AF_INET) is missed.\n\nThis allows a stale has_v4=false to bypass fib6_check_nexthop, causing\nIPv6 routes to be attached to groups that effectively contain only AF_INET\nmembers. Subsequent route lookups then call nexthop_fib6_nh() which\nreturns NULL for the AF_INET member, leading to a NULL pointer\ndereference.\n\nFix by calling nh_group_v4_update whenever the family changes, not just\nAF_INET to AF_INET6.\n\nReproducer:\n\t# AF_INET6 blackhole\n\tip -6 nexthop add id 1 blackhole\n\t# group with has_v4=false\n\tip nexthop add id 100 group 1\n\t# replace with AF_INET (no -6), has_v4 stays false\n\tip nexthop replace id 1 blackhole\n\t# pass stale has_v4 check\n\tip -6 route add 2001:db8::/64 nhid 100\n\t# panic\n\tping -6 2001:db8::1\n\n[1] https://syzkaller.appspot.com/bug?id=e17283eb2f8dcf3dd9b47fe6f67a95f71faadad0\n[2] https://syzkaller.appspot.com/bug?id=8699b6ae54c9f35837d925686208402949e12ef3","published_at":"2026-06-24T16:29:22.973000Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":null,"nvd_references":["https://git.kernel.org/stable/c/ceffe81a0be92afc0cd1340bc8ca46559cce9bb4","https://git.kernel.org/stable/c/9c2d6770a5f4545a307eb66979bef7656a34d621","https://git.kernel.org/stable/c/6275796f22bb382f3e9aa58ed0b4ef7bdad78cb8","https://git.kernel.org/stable/c/aaac3bed034239e1d75732211d9b05f30b0b4f35","https://git.kernel.org/stable/c/ad85961004fd4bd2f31209ac4b07612c6cefb9e7","https://git.kernel.org/stable/c/613c8f4a501421dd258b07ea614205d4e16ec845","https://git.kernel.org/stable/c/b3b7e850e1541f0520c4a12ec884255c30427ff6","https://git.kernel.org/stable/c/29c95185ba32b621fbc3800fb86e7dc3edf5c2be"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-28T17:55:22.518073Z","updated_at":"2026-06-28T23:30:49.890169Z"},"effective_severity":null,"badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7bf4796dd09984ad1612877a82d0d139c70ae27f","version_start_inclusive":true,"version_end":"ceffe81a0be92afc0cd1340bc8ca46559cce9bb4","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7bf4796dd09984ad1612877a82d0d139c70ae27f:ceffe81a0be92afc0cd1340bc8ca46559cce9bb4"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7bf4796dd09984ad1612877a82d0d139c70ae27f","version_start_inclusive":true,"version_end":"9c2d6770a5f4545a307eb66979bef7656a34d621","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7bf4796dd09984ad1612877a82d0d139c70ae27f:9c2d6770a5f4545a307eb66979bef7656a34d621"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7bf4796dd09984ad1612877a82d0d139c70ae27f","version_start_inclusive":true,"version_end":"6275796f22bb382f3e9aa58ed0b4ef7bdad78cb8","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7bf4796dd09984ad1612877a82d0d139c70ae27f:6275796f22bb382f3e9aa58ed0b4ef7bdad78cb8"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7bf4796dd09984ad1612877a82d0d139c70ae27f","version_start_inclusive":true,"version_end":"aaac3bed034239e1d75732211d9b05f30b0b4f35","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7bf4796dd09984ad1612877a82d0d139c70ae27f:aaac3bed034239e1d75732211d9b05f30b0b4f35"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7bf4796dd09984ad1612877a82d0d139c70ae27f","version_start_inclusive":true,"version_end":"ad85961004fd4bd2f31209ac4b07612c6cefb9e7","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7bf4796dd09984ad1612877a82d0d139c70ae27f:ad85961004fd4bd2f31209ac4b07612c6cefb9e7"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7bf4796dd09984ad1612877a82d0d139c70ae27f","version_start_inclusive":true,"version_end":"613c8f4a501421dd258b07ea614205d4e16ec845","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7bf4796dd09984ad1612877a82d0d139c70ae27f:613c8f4a501421dd258b07ea614205d4e16ec845"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7bf4796dd09984ad1612877a82d0d139c70ae27f","version_start_inclusive":true,"version_end":"b3b7e850e1541f0520c4a12ec884255c30427ff6","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7bf4796dd09984ad1612877a82d0d139c70ae27f:b3b7e850e1541f0520c4a12ec884255c30427ff6"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7bf4796dd09984ad1612877a82d0d139c70ae27f","version_start_inclusive":true,"version_end":"29c95185ba32b621fbc3800fb86e7dc3edf5c2be","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7bf4796dd09984ad1612877a82d0d139c70ae27f:29c95185ba32b621fbc3800fb86e7dc3edf5c2be"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"5.3","version_start_inclusive":true,"version_end":"5.3","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.3:5.3"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end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published","source":null}]}