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CVE-2026-43027: 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: netfilter: nf_conntrack_helper: pass helper to expect cleanup nf_conntrack_helper_unregister() calls nf_ct_expect_iterate_destroy() to remove expectations belonging to the helper being unregistered. However, it passes NULL instead of the helper pointer as the data argument, so expect_iter_me() never matches any expectation and all of them survive the cleanup. After unregister returns, nfnl_cthelper_del() frees the helper object immediately. Subsequent expectation dumps or packet-driven init_conntrack() calls then dereference the freed exp->helper, causing a use-after-free. Pass the actual helper pointer so expectations referencing it are properly destroyed before the helper object is freed. BUG: KASAN: slab-use-after-free in string+0x38f/0x430 Read of size 1 at addr ffff888003b14d20 by task poc/103 Call Trace: string+0x38f/0x430 vsnprintf+0x3cc/0x1170 seq_printf+0x17a/0x240 exp_seq_show+0x2e5/0x560 seq_read_iter+0x419/0x1280 proc_reg_read+0x1ac/0x270 vfs_read+0x179/0x930 ksys_read+0xef/0x1c0 Freed by task 103: The buggy address is located 32 bytes inside of freed 192-byte region [ffff888003b14d00, ffff888003b14dc0)

    Засегнати продукти

    • Linux Linux: ac7b848390036dadd4351899d2a23748075916bd преди 5cf28d5c8dcbbe8af6d3b145babe491906d7bad1; ac7b848390036dadd4351899d2a23748075916bd преди 504ba4168466c91210c45acdc332479cfd5f2da6; ac7b848390036dadd4351899d2a23748075916bd преди dc1739eff48e34cc71d4e2f03715493fbcebd8af; ac7b848390036dadd4351899d2a23748075916bd преди 2cf2737c85a2ba2b52024dafe68ffad2676f97be; ac7b848390036dadd4351899d2a23748075916bd преди 2c16e4d64dd91227742dfe196a3e7b0568bef65a; ac7b848390036dadd4351899d2a23748075916bd преди 620f3d14c1ef51d425060a3056ad8dbae8f998a3; ac7b848390036dadd4351899d2a23748075916bd преди 90bd7e8501349db3006d21fbc09df9ffcb172965; ac7b848390036dadd4351899d2a23748075916bd преди a242a9ae58aa46ff7dae51ce64150a93957abe65
    • Linux Linux: 4.14; преди 4.14; 5.10.253 до 5.10.*; 5.15.203 до 5.15.*; 6.1.168 до 6.1.*; 6.6.134 до 6.6.*; 6.12.81 до 6.12.*; 6.18.22 до 6.18.*; 6.19.12 до 6.19.*; от 7.0 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

    • 1 май 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-43027: Linux | freedomonline.bg