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CVE-2026-53012: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    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

    Засегнати продукти

    • Linux Linux: 7bf4796dd09984ad1612877a82d0d139c70ae27f преди ceffe81a0be92afc0cd1340bc8ca46559cce9bb4; 7bf4796dd09984ad1612877a82d0d139c70ae27f преди 9c2d6770a5f4545a307eb66979bef7656a34d621; 7bf4796dd09984ad1612877a82d0d139c70ae27f преди 6275796f22bb382f3e9aa58ed0b4ef7bdad78cb8; 7bf4796dd09984ad1612877a82d0d139c70ae27f преди aaac3bed034239e1d75732211d9b05f30b0b4f35; 7bf4796dd09984ad1612877a82d0d139c70ae27f преди ad85961004fd4bd2f31209ac4b07612c6cefb9e7; 7bf4796dd09984ad1612877a82d0d139c70ae27f преди 613c8f4a501421dd258b07ea614205d4e16ec845; 7bf4796dd09984ad1612877a82d0d139c70ae27f преди b3b7e850e1541f0520c4a12ec884255c30427ff6; 7bf4796dd09984ad1612877a82d0d139c70ae27f преди 29c95185ba32b621fbc3800fb86e7dc3edf5c2be
    • Linux Linux: 5.3; преди 5.3; 5.10.258 до 5.10.*; 5.15.209 до 5.15.*; 6.1.175 до 6.1.*; 6.6.141 до 6.6.*; 6.12.91 до 6.12.*; 6.18.33 до 6.18.*; 7.0.10 до 7.0.*; от 7.1 нататък
    • Siemens: още 3 продукта, добавени от Siemens

      SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP, SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

    История

    • 24 юни 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-53012: Linux | freedomonline.bg