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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.18% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 53c97e9882f4e747b4ac31b211317c2eba541af9, 9128c2411b83a64c0a69d2ff059c741bde25a9cc, 9896bdfd21d918e9f26a52bc6109cc77970ee0b1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 53c97e9882f4e747b4ac31b211317c2eba541af9, 9128c2411b83a64c0a69d2ff059c741bde25a9cc, 9896bdfd21d918e9f26a52bc6109cc77970ee0b1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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().

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Aug 22, 2026
Updated
Oct 16, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.11affected
    • 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 and later · before 53c97e9882f4e747b4ac31b211317c2eba541af9affected · git
    • 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 and later · before 9896bdfd21d918e9f26a52bc6109cc77970ee0b1affected · git
    • 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 and later · before 9128c2411b83a64c0a69d2ff059c741bde25a9ccaffected · git
    • 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 and later · before c19b360fa10c521c0b681875cdaa51545d45a491affected · git
    • 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 and later · before a3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1affected · git
    • 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 and later · before e2b143df29003d2704b51f62e9297006953dbacbaffected · git
    • 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 and later · before c75f8ce4baa29ae57fe615c6a2c5101f59b8b89aaffected · git
    • 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 and later · before f6b079629becfa977f9c51fe53ad2e6dcc55ef44affected · git
    • before 4.11not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.177-16.1.177-1
Debian:13linuxbefore 6.12.95-16.12.95-1
Debian:14linuxbefore 7.0.14-17.0.14-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-74582Aug 21, 2026 · packet: use consistent hard_header_len in non-ring send paths
    31Monitor
  • ← EarlierCVE-2026-74583Aug 21, 2026 · net/sched: cls_route: fix fastmap use-after-free on filter
    31Monitor
  • Later →CVE-2026-74585Aug 22, 2026 · thunderbolt: Bound the DROM dual link port number before indexing sw->ports
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux53c97e9882f4e747b4ac31b211317c2eba541af9Vendor (CNA)
Linux Linux9128c2411b83a64c0a69d2ff059c741bde25a9ccVendor (CNA)
Linux Linux9896bdfd21d918e9f26a52bc6109cc77970ee0b1Vendor (CNA)
Linux Linuxa3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1Vendor (CNA)
Linux Linuxc19b360fa10c521c0b681875cdaa51545d45a491Vendor (CNA)
Linux Linuxc75f8ce4baa29ae57fe615c6a2c5101f59b8b89aVendor (CNA)
Linux Linuxe2b143df29003d2704b51f62e9297006953dbacbVendor (CNA)
Linux Linuxf6b079629becfa977f9c51fe53ad2e6dcc55ef44Vendor (CNA)
debian:linux6.1.177-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records