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CVE-2026-74584— RDMA/bnxt_re: zero shared page before exposing to userspace

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： RDMA/bnxt_re：在向用户空间暴露之前清零共享页面 函数通过 分配 。伙伴分配器在未指定 标志时不会将页面内容清零，因此该页面中可能包含最近释放该页面的对象留下的旧内核数据。 随后， 函数通过 在 中使用 将该页面映射到用户空间。驱动程序仅在 中向偏移量 （0x10）处写入 4 个字节（一个 u32 类型的 AVID），而页面其余的 4092 字节未经过清理便暴露给用户空间，从而导致内核内存内容泄露。 任何能够访问拥有 bnxt_re 设备的主机上 的用户（通常

AI Predicted 7.8 Difficulty: Trivial

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1ac5a404797523cedaf424a3aaa3cf8f9548dff8< 53c97e9882f4e747b4ac31b211317c2eba541af9 affected
1ac5a404797523cedaf424a3aaa3cf8f9548dff8< 9896bdfd21d918e9f26a52bc6109cc77970ee0b1 affected
1ac5a404797523cedaf424a3aaa3cf8f9548dff8< 9128c2411b83a64c0a69d2ff059c741bde25a9cc affected
1ac5a404797523cedaf424a3aaa3cf8f9548dff8< c19b360fa10c521c0b681875cdaa51545d45a491 affected
1ac5a404797523cedaf424a3aaa3cf8f9548dff8< a3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1 affected
1ac5a404797523cedaf424a3aaa3cf8f9548dff8< e2b143df29003d2704b51f62e9297006953dbacb affected
1ac5a404797523cedaf424a3aaa3cf8f9548dff8< c75f8ce4baa29ae57fe615c6a2c5101f59b8b89a affected
1ac5a404797523cedaf424a3aaa3cf8f9548dff8< f6b079629becfa977f9c51fe53ad2e6dcc55ef44 affected
… +10 more rows
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I. Basic Information for CVE-2026-74584

Vulnerability Information
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Vulnerability Title
RDMA/bnxt_re: zero shared page before exposing to userspace
Source: CVE Program / CVE List V5
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().
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 ~ 53c97e9882f4e747b4ac31b211317c2eba541af9 -
Linux Linux 4.11 -

II. Public POCs for CVE-2026-74584

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III. Intelligence Information for CVE-2026-74584

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Patches & Fixes for CVE-2026-74584 (6)

Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total

CVE-2026-74640 ALSA: FCP: fix OOB write in fcp_meter_ctl_get()
CVE-2026-74622 net: atlantic: free RX pages of consumed but not refilled buffers
CVE-2026-74623 net: atlantic: free stranded TX buffers on ring deinit
CVE-2026-74624 netfilter: nf_conntrack: defer invalid log until after unlock
CVE-2026-74625 netfilter: bridge: release template ct on non-IP path
CVE-2026-74627 net: devmem: prevent net-iov / page mixing
CVE-2026-74626 NTB: ntb_netdev: Preserve RX queue depth on allocation failure
CVE-2026-74628 net/x25: fix use-after-free of the socket by its timers
CVE-2026-74629 net/dibs: Correct freeing of dmb_clientid_arr
CVE-2026-74631 net: smc: fix splice entry lifetime imbalance in smc_rx_splice
CVE-2026-74630 ipv6: prevent in6_dev_get() from resurrecting inet6_dev
CVE-2026-74632 mm/huge_memory: fix huge_zero_pfn race
CVE-2026-74633 tracing: Fix NULL pointer dereference in module event cache removal
CVE-2026-74634 ring-buffer: Prevent subbuf order change when resizing is disabled
CVE-2026-74635 fbdev: bitblit: bound-check glyph index in bit_cursor()
CVE-2026-74636 tracing: Fix race between update_event_fields and, event_define_fields
CVE-2026-74637 perf/core: Fix group leader use-after-free after sibling detach
CVE-2026-74639 ALSA: us144mkii: re-anchor capture URBs on resubmission
CVE-2026-74638 drm/v3d: Serialize the scheduler timeout handlers
CVE-2026-74651 staging: rtl8723bs: fix OOB read in rtw_get_wpa_ie()

Showing top 20 of 150 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74584

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