CVE-2026-53012

{"id": "CVE-2026-53012", "cveTags": [], "metrics": {}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f", "lessThan": "ceffe81a0be92afc0cd1340bc8ca46559cce9bb4", "versionType": "git"}, {"status": "affected", "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f", "lessThan": "9c2d6770a5f4545a307eb66979bef7656a34d621", "versionType": "git"}, {"status": "affected", "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f", "lessThan": "6275796f22bb382f3e9aa58ed0b4ef7bdad78cb8", "versionType": "git"}, {"status": "affected", "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f", "lessThan": "aaac3bed034239e1d75732211d9b05f30b0b4f35", "versionType": "git"}, {"status": "affected", "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f", "lessThan": "ad85961004fd4bd2f31209ac4b07612c6cefb9e7", "versionType": "git"}, {"status": "affected", "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f", "lessThan": "613c8f4a501421dd258b07ea614205d4e16ec845", "versionType": "git"}, {"status": "affected", "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f", "lessThan": "b3b7e850e1541f0520c4a12ec884255c30427ff6", "versionType": "git"}, {"status": "affected", "version": "7bf4796dd09984ad1612877a82d0d139c70ae27f", "lessThan": "29c95185ba32b621fbc3800fb86e7dc3edf5c2be", "versionType": "git"}], "programFiles": ["net/ipv4/nexthop.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.3"}, {"status": "unaffected", "version": "0", "lessThan": "5.3", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.258", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.209", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.141", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.91", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.33", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.10", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv4/nexthop.c"], "defaultStatus": "affected"}]}], "published": "2026-06-24T17:17:12.433", "references": [{"url": "https://git.kernel.org/stable/c/29c95185ba32b621fbc3800fb86e7dc3edf5c2be", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/613c8f4a501421dd258b07ea614205d4e16ec845", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6275796f22bb382f3e9aa58ed0b4ef7bdad78cb8", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9c2d6770a5f4545a307eb66979bef7656a34d621", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/aaac3bed034239e1d75732211d9b05f30b0b4f35", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ad85961004fd4bd2f31209ac4b07612c6cefb9e7", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b3b7e850e1541f0520c4a12ec884255c30427ff6", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ceffe81a0be92afc0cd1340bc8ca46559cce9bb4", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "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"}], "lastModified": "2026-06-24T17:17:12.433", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}