Към съдържанието
Търсене

CVE-2026-74310: Linux

9.3

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, без вход и без действие от потребителя.

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

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: vhost/net: complete zerocopy ubufs only once vhost-net initializes one ubuf_info per outstanding zerocopy TX descriptor and hands it to the backend socket. The networking stack may then clone a zerocopy skb before all skb references are released. For example, batman-adv fragmentation reaches skb_split(), which calls skb_zerocopy_clone() and increments the same ubuf_info refcount. vhost_zerocopy_complete() currently treats every ubuf callback as a completed vhost descriptor. It dereferences ubuf->ctx, writes the descriptor completion state, and drops the vhost_net_ubuf_ref even when the callback only releases a cloned skb reference. A backend reset can therefore wait for and free the vhost_net_ubuf_ref while another cloned skb still carries the same ubuf_info. A later completion then dereferences the freed ubufs pointer. KASAN reports the stale completion as: BUG: KASAN: slab-use-after-free in vhost_zerocopy_complete+0x1d7/0x1f0 BUG: KASAN: slab-use-after-free in vhost_zerocopy_complete+0x101/0x1f0 vhost_zerocopy_complete skb_copy_ubufs __dev_forward_skb2 veth_xmit The freed object was allocated from vhost_net_ioctl() while setting the backend and freed through kfree_rcu()/kvfree_rcu_bulk after backend removal, while delayed skb completion still reached vhost_zerocopy_complete(). Honor the generic ubuf_info refcount before touching vhost state, and run the vhost descriptor completion only for the final ubuf reference. This matches the msg_zerocopy_complete() ownership rule for cloned zerocopy skbs.

Засегнати продукти

  • Linux Linux: bab632d69ee48a106e779b60cc01adfe80a72807 преди ea71f873423fb73e66ad88936d6759ac0ad4aa53; bab632d69ee48a106e779b60cc01adfe80a72807 преди 6445b945024f4c7675ae5352b2d5885cb1deea71; bab632d69ee48a106e779b60cc01adfe80a72807 преди a9f8a1d2e3ff511eafd4c5462481950c2f4d2b5d; bab632d69ee48a106e779b60cc01adfe80a72807 преди 321c73baf54d971ce3771fea275c98a247f7ee35; bab632d69ee48a106e779b60cc01adfe80a72807 преди c069437924663539a93a1e5afe90838d9ccee284; bab632d69ee48a106e779b60cc01adfe80a72807 преди 8f6898fe80794f2d7c3d38c1158c806e4074a1c4
  • Linux Linux: 3.1; преди 3.1; 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

История

  • 15 август 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-74310: Linux | freedomonline.bg