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CVE-2026-31669: Linux, грешка в паметта

9.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се по мрежата, без особени условия, без вход и без действие от потребителя.

CVE радар: още уязвимости от този вид

  • Експлоатация: няма данни за експлоатация
  • Атаката може да се автоматизира

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix slab-use-after-free in __inet_lookup_established The ehash table lookups are lockless and rely on SLAB_TYPESAFE_BY_RCU to guarantee socket memory stability during RCU read-side critical sections. Both tcp_prot and tcpv6_prot have their slab caches created with this flag via proto_register(). However, MPTCP's mptcp_subflow_init() copies tcpv6_prot into tcpv6_prot_override during inet_init() (fs_initcall, level 5), before inet6_init() (module_init/device_initcall, level 6) has called proto_register(&tcpv6_prot). At that point, tcpv6_prot.slab is still NULL, so tcpv6_prot_override.slab remains NULL permanently. This causes MPTCP v6 subflow child sockets to be allocated via kmalloc (falling into kmalloc-4k) instead of the TCPv6 slab cache. The kmalloc-4k cache lacks SLAB_TYPESAFE_BY_RCU, so when these sockets are freed without SOCK_RCU_FREE (which is cleared for child sockets by design), the memory can be immediately reused. Concurrent ehash lookups under rcu_read_lock can then access freed memory, triggering a slab-use-after-free in __inet_lookup_established. Fix this by splitting the IPv6-specific initialization out of mptcp_subflow_init() into a new mptcp_subflow_v6_init(), called from mptcp_proto_v6_init() before protocol registration. This ensures tcpv6_prot_override.slab correctly inherits the SLAB_TYPESAFE_BY_RCU slab cache.

Засегнати продукти

  • Linux Linux: b19bc2945b40b9fd38e835700907ffe8534ef0de преди f6e1f25fa5e733570f6d6fe37a4dfed2a0deba47; b19bc2945b40b9fd38e835700907ffe8534ef0de преди fb1f54b7d16f393b8b65d328410f78b4beea8fcc; b19bc2945b40b9fd38e835700907ffe8534ef0de преди 3fd6547f5b8ac99687be6d937a0321efda760597; b19bc2945b40b9fd38e835700907ffe8534ef0de преди eb9c6aeb512f877cf397deb1e4526f646c70e4a7; b19bc2945b40b9fd38e835700907ffe8534ef0de преди 15fa9ead4d5e6b6b9c794e84144146c917f2cb62; b19bc2945b40b9fd38e835700907ffe8534ef0de преди b313e9037d98c13938740e5ebda7852929366dff; b19bc2945b40b9fd38e835700907ffe8534ef0de преди 9b55b253907e7431210483519c5ad711a37dafa1
  • Linux Linux: 5.12; преди 5.12; 5.15.203 до 5.15.*; 6.1.169 до 6.1.*; 6.6.135 до 6.6.*; 6.12.82 до 6.12.*; 6.18.23 до 6.18.*; 6.19.13 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

Вид слабост

История

  • 24 април 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-31669: Linux, грешка в паметта | freedomonline.bg