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CVE-2026-23398: 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: icmp: fix NULL pointer dereference in icmp_tag_validation() icmp_tag_validation() unconditionally dereferences the result of rcu_dereference(inet_protos[proto]) without checking for NULL. The inet_protos[] array is sparse -- only about 15 of 256 protocol numbers have registered handlers. When ip_no_pmtu_disc is set to 3 (hardened PMTU mode) and the kernel receives an ICMP Fragmentation Needed error with a quoted inner IP header containing an unregistered protocol number, the NULL dereference causes a kernel panic in softirq context. Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] RIP: 0010:icmp_unreach (net/ipv4/icmp.c:1085 net/ipv4/icmp.c:1143) Call Trace: <IRQ> icmp_rcv (net/ipv4/icmp.c:1527) ip_protocol_deliver_rcu (net/ipv4/ip_input.c:207) ip_local_deliver_finish (net/ipv4/ip_input.c:242) ip_local_deliver (net/ipv4/ip_input.c:262) ip_rcv (net/ipv4/ip_input.c:573) __netif_receive_skb_one_core (net/core/dev.c:6164) process_backlog (net/core/dev.c:6628) handle_softirqs (kernel/softirq.c:561) </IRQ> Add a NULL check before accessing icmp_strict_tag_validation. If the protocol has no registered handler, return false since it cannot perform strict tag validation.

    Засегнати продукти

    • Linux Linux: 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e преди 571d9d7b650f02d1e38c01128817868bceac9edd; 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e преди d783fa413c702ff0f8f8bea63f862e28eeaf39e3; 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e преди 1f9f2c6d4b2a613b7756fc5679c5116ba2ca0161; 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e преди b61529c357f1ee4d64836eb142a542d2e7ad67ce; 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e преди 9647e99d2a617c355d2b378be0ff6d0e848fd579; 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e преди d938dd5a0ad780c891ea3bc94cae7405f11e618a; 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e преди 1e4e2f5e48cec0cccaea9815fb9486c084ba41e2; 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e преди 614aefe56af8e13331e50220c936fc0689cf5675
    • Linux Linux: 3.14; преди 3.14; 5.10.253 до 5.10.*; 5.15.203 до 5.15.*; 6.1.167 до 6.1.*; 6.6.130 до 6.6.*; 6.12.78 до 6.12.*; 6.18.20 до 6.18.*; 6.19.10 до 6.19.*; 7.0 до *
    • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: V3.1.6 преди *
    • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: V3.1.6 преди *
    • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: преди *
    • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: V3.1.6 преди *

    История

    • 26 март 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-23398: Linux | freedomonline.bg