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  - 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. (CVE-2026-23300)

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Linux Distros Unpatched Vulnerability : CVE-2026-23300

medium Nessus Plugin ID 303725

Version 1.4

Version 1.3

Version 1.2

Version 1.1

Version 1.4 May 3, 2026, 4:59 AM CVSS metrics ("CVSSv2 score" set to 7.5) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:N/AC:L/Au:S/C:N/I:P/A:C") CVSSv2 severity (based on CVE-2026-23300, severity increased from "Medium" to "High") Detection (updated detection logic) Plugin metadata Plugin Feed: 202605030459
Version 1.3 May 2, 2026, 11:12 PM Detection (updated detection logic) Plugin metadata Plugin Feed: 202605022312
Version 1.2 Mar 28, 2026, 12:01 PM CVSS metrics ("CVSSv2 score" set to 6.8) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:C") CVSS metrics ("CVSSv3 score" set to 6.5) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H") Detection (updated detection logic) Plugin metadata Plugin Feed: 202603281201
Version 1.1 Mar 26, 2026, 1:29 AM New Plugin Feed: 202603260129