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CVE-2026-74587: Linux

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.

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

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: sctp: fix use-after-free of cached ASCONF chunk addip_last_asconf caches the outstanding outbound ASCONF chunk. The normal ASCONF-ACK completion path releases the chunk and clears the pointer. However, sctp_asconf_queue_teardown() releases the cached chunk without clearing addip_last_asconf. During peer restart handling, sctp_sf_do_dupcook_a() queues SCTP_CMD_PURGE_ASCONF_QUEUE, which invokes sctp_asconf_queue_teardown() while the association remains alive and leaves the pointer dangling. A delayed authenticated ASCONF-ACK can then reach sctp_sf_do_asconf_ack(), which accesses the stale chunk and passes it to sctp_process_asconf_ack(), causing a use-after-free and a second release. Clearing the pointer exposes a race with T4 expiry. Peer restart handling queues the timer stop before the purge, but SCTP_CMD_TIMER_STOP uses timer_delete(), which does not wait for a callback already running on another CPU. Such a callback can reach sctp_sf_t4_timer_expire() after the purge and dereference NULL. Clear addip_last_asconf after releasing the cached chunk, and make sctp_sf_t4_timer_expire() consume a stale T4 expiry if no outstanding ASCONF remains.

Засегнати продукти

  • Linux Linux: a000c01e60e40e15304ffe48fff051d17a7bea91 преди 10459b03e2d9ee12435e96f587de4d4cacdbf435; a000c01e60e40e15304ffe48fff051d17a7bea91 преди e1bb114e09372fd6e03387ced9ef566da336ed6c; a000c01e60e40e15304ffe48fff051d17a7bea91 преди 179676f0166230c80053a392303485b37c93dd33; a000c01e60e40e15304ffe48fff051d17a7bea91 преди dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d; a000c01e60e40e15304ffe48fff051d17a7bea91 преди 618b5c6d049896fcfabb91afc072954c92cb2693; a000c01e60e40e15304ffe48fff051d17a7bea91 преди 07daf4f9750104960a1d60831b2353c0d41f35fb; a000c01e60e40e15304ffe48fff051d17a7bea91 преди d949992bc3f00027a2c755e860a11950c75f6073; a000c01e60e40e15304ffe48fff051d17a7bea91 преди 8c283e7b56adce00193837f3311b06662466fb21
  • Linux Linux: 3.0; преди 3.0; 5.10.265 до 5.10.*; 5.15.216 до 5.15.*; 6.1.183 до 6.1.*; 6.6.152 до 6.6.*; 6.12.104 до 6.12.*; 6.18.45 до 6.18.*; 7.1.9 до 7.1.*; 7.2 до *

История

  • 22 август 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-74587: Linux | freedomonline.bg