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CVE-2026-23300: Linux

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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: net: ipv6: fix panic when IPv4 route references loopback IPv6 nexthop When a standalone IPv6 nexthop object is created with a loopback device (e.g., "ip -6 nexthop add id 100 dev lo"), fib6_nh_init() misclassifies it as a reject route. This is because nexthop objects have no destination prefix (fc_dst=::), causing fib6_is_reject() to match any loopback nexthop. The reject path skips fib_nh_common_init(), leaving nhc_pcpu_rth_output unallocated. If an IPv4 route later references this nexthop, __mkroute_output() dereferences NULL nhc_pcpu_rth_output and panics. Simplify the check in fib6_nh_init() to only match explicit reject routes (RTF_REJECT) instead of using fib6_is_reject(). The loopback promotion heuristic in fib6_is_reject() is handled separately by ip6_route_info_create_nh(). After this change, the three cases behave as follows: 1. Explicit reject route ("ip -6 route add unreachable 2001:db8::/64"): RTF_REJECT is set, enters reject path, skips fib_nh_common_init(). No behavior change. 2. Implicit loopback reject route ("ip -6 route add 2001:db8::/32 dev lo"): RTF_REJECT is not set, takes normal path, fib_nh_common_init() is called. ip6_route_info_create_nh() still promotes it to reject afterward. nhc_pcpu_rth_output is allocated but unused, which is harmless. 3. Standalone nexthop object ("ip -6 nexthop add id 100 dev lo"): RTF_REJECT is not set, takes normal path, fib_nh_common_init() is called. nhc_pcpu_rth_output is properly allocated, fixing the crash when IPv4 routes reference this nexthop.

    Засегнати продукти

    • Linux Linux: 493ced1ac47c48bb86d9d4e8e87df8592be85a0e преди 607e68c1b7c5a30c795571be1906d716e989a644; 493ced1ac47c48bb86d9d4e8e87df8592be85a0e преди c11d7c56c2076ee9cd72004f1976fe0734df2ae9; 493ced1ac47c48bb86d9d4e8e87df8592be85a0e преди b5062fc2150614c9ea8a611c2e0cb6e047ebfa3a; 493ced1ac47c48bb86d9d4e8e87df8592be85a0e преди b299121e7453d23faddf464087dff513a495b4fc; 493ced1ac47c48bb86d9d4e8e87df8592be85a0e преди f7c9f8e3607440fe39300efbaf46cf7b5eecb23f; 493ced1ac47c48bb86d9d4e8e87df8592be85a0e преди b3b5a037d520afe3d5276e653bc0ff516bbda34c; 493ced1ac47c48bb86d9d4e8e87df8592be85a0e преди 8650db85b4259d2885d2a80fbc2317ce24194133; 493ced1ac47c48bb86d9d4e8e87df8592be85a0e преди 21ec92774d1536f71bdc90b0e3d052eff99cf093
    • Linux Linux: 5.3; преди 5.3; 5.10.253 до 5.10.*; 5.15.203 до 5.15.*; 6.1.167 до 6.1.*; 6.6.130 до 6.6.*; 6.12.77 до 6.12.*; 6.18.17 до 6.18.*; 6.19.7 до 6.19.*; от 7.0 нататък
    • Siemens: още 4 продукта, добавени от Siemens

      SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP, SIMATIC S7-1500 TM MFP - GNU/Linux subsystem, SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

    История

    • 25 март 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-23300: Linux | freedomonline.bg