Към съдържанието
Търсене

CVE-2026-99074: Linux

Няма оценка

CVSS

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: ipv4: stop PMTU walk when nexthop group shrinks Commit 7d3f3b4367f3 ("net: ipv4: Cache pmtu for all packet paths if multipath enabled") made __ip_rt_update_pmtu() update every path. For nexthop objects, fib_info_num_path() and fib_info_nhc() independently load nh->nh_grp. RCU protects each group's lifetime but does not make the loads observe the same group. If replacement shrinks the group after the loop accepts an index, fib_info_nhc() returns NULL and update_or_create_fnhe() dereferences it. A deterministic probe only widened the existing window between the real operations. On v7.2, an RTM_NEWNEXTHOP replacement published a one-member group after the PMTU reader accepted index 1 from a two-member group, producing: KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: update_or_create_fnhe+0x45/0x15b0 Stop when the indexed path is absent. Groups are dense, so no later index exists in that snapshot. The same real-writer window completed 114,423 PMTU iterations without an oops with this check. A reproducer is available on request. Replacement requires CAP_NET_ADMIN in the network namespace. Where unprivileged user namespaces are permitted, a local user can obtain it in a new user and network namespace.

    Засегнати продукти

    • Linux Linux: fc07a232326a623d0be482e307c08ea7049c2846 преди 82d83eec893d8ae84f280aec44c60d9fdecc62b5; b1f7bdee5750d6cbb9497140cd6582abc5fdcb9e преди a411df69524f91fe3adb8f9544d33e701fc9732c; 3bed2abab4a682d426624ce9add9d7b6d475d4e4 преди 7fd60d3c9a1e1b11ef5f1643bbae78d91eae2f4a; 7f5005457b3072fe1ddf15bfef869f2a1d98e05e преди c60d17d6dd61adc761ac6f65a008fefbc54cbf87; 7d3f3b4367f315a61fc615e3138f3d320da8c466 преди c6d670ac656badfd0e15355e07a13a6bdf3b69fd; 7d3f3b4367f315a61fc615e3138f3d320da8c466 преди f27483f9975b5065ff67054cc7eb8edac6083488; 7d3f3b4367f315a61fc615e3138f3d320da8c466 преди 6619e01855e65ef35723685a557e3eb106f4ecf5; 5.15.179 преди 5.15.224; 6.1.129 преди 6.1.191; 6.6.79 преди 6.6.160; 6.12.16 преди 6.12.113
    • Linux Linux: 6.13; преди 6.13; 5.15.224 до 5.15.*; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.113 до 6.12.*; 6.18.57 до 6.18.*; 7.2.11 до 7.2.*; 7.3 до *

    История

    • 23 октомври 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-99074: Linux | freedomonline.bg