CVE-2026-74584: Linux Vulnerability

Description

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().

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 1ac5a404797523cedaf424a3aaa3cf8f9548dff8, < 53c97e9882f4e747b4ac31b211317c2eba541af9; >= 1ac5a404797523cedaf424a3aaa3cf8f9548dff8, < 9896bdfd21d918e9f26a52bc6109cc77970ee0b1; >= 1ac5a404797523cedaf424a3aaa3cf8f9548dff8, < 9128c2411b83a64c0a69d2ff059c741bde25a9cc; >= 1ac5a404797523cedaf424a3aaa3cf8f9548dff8, < c19b360fa10c521c0b681875cdaa51545d45a491; >= 1ac5a404797523cedaf424a3aaa3cf8f9548dff8, < a3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1; >= 1ac5a404797523cedaf424a3aaa3cf8f9548dff8, < e2b143df29003d2704b51f62e9297006953dbacb; >= 1ac5a404797523cedaf424a3aaa3cf8f9548dff8, < c75f8ce4baa29ae57fe615c6a2c5101f59b8b89a; >= 1ac5a404797523cedaf424a3aaa3cf8f9548dff8, < f6b079629becfa977f9c51fe53ad2e6dcc55ef44
Linux	Linux	4.11

References

Timeline

Published: Aug 22, 2026
Last Modified: Aug 22, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-74584?

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().

How severe is CVE-2026-74584?

Severity scoring for CVE-2026-74584 is pending analysis.

How do I fix CVE-2026-74584?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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