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CVE-2026-72072: Linux, грешка в паметта

7.8

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 локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

CVE радар: още уязвимости от този вид

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

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: macsec: fix use-after-free of metadata_dst on RX SC delete When an offloaded MACsec RX SC is deleted, macsec_del_rxsc_ctx() freed the per-SC metadata_dst with metadata_dst_free(), which kfree()s the object unconditionally and ignores the dst reference count. The RX datapath in mlx5e_macsec_offload_handle_rx_skb() looks up the SC under rcu_read_lock() via xa_load(), takes a reference with dst_hold() and attaches the dst to the skb with skb_dst_set(). A reader that already obtained the rx_sc pointer can race with the delete path and operate on freed memory. Fix the owner side by dropping the reference with dst_release() instead of freeing unconditionally, and convert the RX datapath to dst_hold_safe() so a reader racing the SC delete cannot attach a dst whose last reference was just dropped; only attach it when a reference was actually taken. mlx5e_macsec_add_rxsc() also published sc_xarray_element via xa_alloc() before rx_sc->md_dst was allocated and initialised, so a datapath reader that looked the SC up by fs_id could observe rx_sc with md_dst still NULL or, on weakly-ordered architectures, a non-NULL md_dst pointer whose contents were not yet visible. NULL-check the xa_load() result and md_dst on the datapath, and reorder add_rxsc() so the xa_alloc() publish happens only after md_dst is fully initialised; the xarray RCU publish then pairs with the rcu_read_lock()/xa_load() in the datapath. Note: macsec_del_rxsc_ctx() also kfree()s rx_sc->sc_xarray_element without an RCU grace period while the same datapath reads it under rcu_read_lock(); that is a separate pre-existing issue left to a follow-up patch. Found by 0sec automated security-research tooling (https://0sec.ai).

Засегнати продукти

  • Linux Linux: b7c9400cbc48c3713190b3bce4e0c87e924e4104 преди b1a4d0c568bbb52c7c04f4fce3c097dae89ed6cb; b7c9400cbc48c3713190b3bce4e0c87e924e4104 преди 218cc15a4c907659ad4b0e68c535c61594311205; b7c9400cbc48c3713190b3bce4e0c87e924e4104 преди 4a5073b7b30243658f58b2d2d35a823da7fd34d9; b7c9400cbc48c3713190b3bce4e0c87e924e4104 преди ed3cc4218070d6b98bf5fb456dccae424fd38c4f; b7c9400cbc48c3713190b3bce4e0c87e924e4104 преди 088873af13590ebde10de2ade847f57a05ec61c6; b7c9400cbc48c3713190b3bce4e0c87e924e4104 преди de74d8fd10291763d97b218f09adcc7513c975e4
  • Linux Linux: 6.1; преди 6.1; 6.1.178 до 6.1.*; 6.6.145 до 6.6.*; 6.12.97 до 6.12.*; 6.18.40 до 6.18.*; 7.1.5 до 7.1.*; от 7.2 нататък

Вид слабост

История

  • 15 август 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-72072: Linux, грешка в паметта | freedomonline.bg