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CVE-2026-64352: 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: bpf: Allow LPM map access from sleepable BPF programs trie_lookup_elem() annotates its rcu_dereference_check() walks with only rcu_read_lock_bh_held(). Because rcu_dereference_check(p, c) resolves to "c || rcu_read_lock_held()", this passes for XDP/NAPI and classic RCU readers but fails for sleepable BPF programs, which enter via __bpf_prog_enter_sleepable() and hold only rcu_read_lock_trace(). trie_update_elem() and trie_delete_elem() have the same problem in a different form: they walk the trie with plain rcu_dereference(), which asserts rcu_read_lock_held() unconditionally. Both are reachable from sleepable BPF programs via the bpf_map_update_elem / bpf_map_delete_elem helpers, and from the syscall path under classic rcu_read_lock(). In the writer paths the trie is actually protected by trie->lock (an rqspinlock taken across the walk); we never relied on the RCU read-side lock to keep nodes alive there. A sleepable LSM hook that ends up touching an LPM trie therefore triggers lockdep on debug kernels: ============================= WARNING: suspicious RCU usage 7.1.0-... Tainted: G E ----------------------------- kernel/bpf/lpm_trie.c:249 suspicious rcu_dereference_check() usage! 1 lock held by net_tests/540: #0: (rcu_tasks_trace_srcu_struct){....}-{0:0}, at: __bpf_prog_enter_sleepable+0x26/0x280 Call Trace: dump_stack_lvl lockdep_rcu_suspicious trie_lookup_elem bpf_prog_..._enforce_security_socket_connect bpf_trampoline_... security_socket_connect __sys_connect do_syscall_64 This is lockdep-only -- no UAF, since Tasks Trace RCU does serialize against the trie's reclaim path -- but it spams the console once per distinct callsite on every debug kernel running a sleepable BPF LSM that touches an LPM trie, which is increasingly common. For the lookup path, switch the rcu_dereference_check() annotation from rcu_read_lock_bh_held() to

    Засегнати продукти

    • Linux Linux: 694cea395fded425008e93cd90cfdf7a451674af преди f0967d4f1ba4323a3cb7dc8fdba74dd3a8caaf04; 694cea395fded425008e93cd90cfdf7a451674af преди 304ca50582f0c047370f85e13caec456f78c9fcc; 694cea395fded425008e93cd90cfdf7a451674af преди ec662a8b2cde01e76b37ccd4b992d0342299e69c; 694cea395fded425008e93cd90cfdf7a451674af преди 9bfdf4b81b0e56d47bc6c46c34a46638be716695; 694cea395fded425008e93cd90cfdf7a451674af преди 57454944737f3ad9a8703aecbbb79713b513a94b; 694cea395fded425008e93cd90cfdf7a451674af преди bd6ad9a6b30498d845413e863fb95c6fab3babe3; 694cea395fded425008e93cd90cfdf7a451674af преди 2f884d371fafea137afea504d49ee4a7c8d7985b
    • Linux Linux: 5.14; преди 5.14; 5.15.212 до 5.15.*; 6.1.178 до 6.1.*; 6.6.145 до 6.6.*; 6.12.97 до 6.12.*; 6.18.40 до 6.18.*; 7.1.4 до 7.1.*; от 7.2 нататък

    История

    • 25 юли 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-64352: Linux | freedomonline.bg