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CVE-2026-74584: Linux

7.1

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: RDMA/bnxt_re: zero shared page before exposing to userspace bnxt_re_alloc_ucontext() allocates uctx->shpg via __get_free_page(GFP_KERNEL). The buddy allocator does not zero pages without __GFP_ZERO, so the page contains stale kernel data from whatever object most recently freed it. The page is then mapped into userspace via vm_insert_page() under BNXT_RE_MMAP_SH_PAGE in bnxt_re_mmap(). The driver only ever writes 4 bytes (a u32 AVID) at offset BNXT_RE_AVID_OFFT (0x10) inside bnxt_re_create_ah(); the remaining 4092 bytes of the page are exposed to userspace unsanitised, leaking kernel memory contents. Any user with access to /dev/infiniband/uverbsX on a host with a bnxt_re device (typically rdma group membership) can read this data via a single mmap() at pgoff 0 after IB_USER_VERBS_CMD_GET_CONTEXT. Other shared pages in the same file already use get_zeroed_page() correctly: drivers/infiniband/hw/bnxt_re/ib_verbs.c srq->uctx_srq_page = (void *)get_zeroed_page(GFP_KERNEL); cq->uctx_cq_page = (void *)get_zeroed_page(GFP_KERNEL); uctx->shpg is the only outlier. Bring it in line with the existing convention by switching to get_zeroed_page().

Засегнати продукти

  • Linux Linux: 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 преди 53c97e9882f4e747b4ac31b211317c2eba541af9; 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 преди 9896bdfd21d918e9f26a52bc6109cc77970ee0b1; 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 преди 9128c2411b83a64c0a69d2ff059c741bde25a9cc; 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 преди c19b360fa10c521c0b681875cdaa51545d45a491; 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 преди a3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1; 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 преди e2b143df29003d2704b51f62e9297006953dbacb; 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 преди c75f8ce4baa29ae57fe615c6a2c5101f59b8b89a; 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 преди f6b079629becfa977f9c51fe53ad2e6dcc55ef44
  • Linux Linux: 4.11; преди 4.11; 5.10.260 до 5.10.*; 5.15.211 до 5.15.*; 6.1.177 до 6.1.*; 6.6.144 до 6.6.*; 6.12.95 до 6.12.*; 6.18.37 до 6.18.*; 7.0.14 до 7.0.*; от 7.1 нататък

История

  • 22 август 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-74584: Linux | freedomonline.bg