CVE-2026-74584

Kernel-memory disclosure via unzeroed bnxt_re shared page

Published Aug 22, 2026 · Updated Aug 25, 2026

Information disclosure in the Linux kernel's bnxt_re driver allows local users to read stale kernel memory through a uverbs mapping. bnxt_re_alloc_ucontext() obtains uctx->shpg with __get_free_page(GFP_KERNEL), and bnxt_re_mmap() maps it after only four bytes are initialized, exposing the remaining 4,092 bytes. Reachability requires local access to /dev/infiniband/uverbsX on a host with a bnxt_re device; the consequence is read-only disclosure without code execution or service interruption.

CVSS severity7.1
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Linux kernel's bnxt_re driver allows local users to read stale kernel memory through a uverbs mapping. bnxt_re_alloc_ucontext() obtains uctx->shpg with __get_free_page(GFP_KERNEL), and bnxt_re_mmap() maps it after only four bytes are initialized, exposing the remaining 4,092 bytes. Reachability requires local access to /dev/infiniband/uverbsX on a host with a bnxt_re device; the consequence is read-only disclosure without code execution or service interruption.

The record

CVE
CVE-2026-74584
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <53c97e9882f4e747b4ac31b211317c2eba541af9
  2. Affected versionversion=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <9128c2411b83a64c0a69d2ff059c741bde25a9cc
  3. Affected versionversion=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <9896bdfd21d918e9f26a52bc6109cc77970ee0b1
  4. Affected versionversion=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <a3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1
  5. Affected versionversion=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <c19b360fa10c521c0b681875cdaa51545d45a491
  6. Affected versionversion=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <c75f8ce4baa29ae57fe615c6a2c5101f59b8b89a
  7. Affected versionversion=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <e2b143df29003d2704b51f62e9297006953dbacb
  8. Affected versionversion=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <f6b079629becfa977f9c51fe53ad2e6dcc55ef44
  9. Affected versionversion=4.11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <53c97e9882f4e747b4ac31b211317c2eba541af9; version=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <9128c2411b83a64c0a69d2ff059c741bde25a9cc; version=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <9896bdfd21d918e9f26a52bc6109cc77970ee0b1; version=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <a3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1; version=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <c19b360fa10c521c0b681875cdaa51545d45a491; version=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <c75f8ce4baa29ae57fe615c6a2c5101f59b8b89a; version=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <e2b143df29003d2704b51f62e9297006953dbacb; version=1ac5a404797523cedaf424a3aaa3cf8f9548dff8 <f6b079629becfa977f9c51fe53ad2e6dcc55ef44; version=4.11

Published CVSS scores

7.1Linux CNACVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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