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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98354: RDMA/mad: Fix receive buffer leak when PKey enforcement fails

—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.16% (FIRST EPSS).
  • Fixed version: Linux Linux 3476c28c9addfa253f505e6bd87f1f5598b961d0, 39c4ea72a40503e102ae07e6776005f96ca078a6, 4617c9a856188674dddb0ca66979746d07688579; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 3476c28c9addfa253f505e6bd87f1f5598b961d0, 39c4ea72a40503e102ae07e6776005f96ca078a6, 4617c9a856188674dddb0ca66979746d07688579; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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/mad: Fix receive buffer leak when PKey enforcement fails ib_mad_complete_recv() initializes mad_recv_wc->rmpp_list and then runs ib_mad_enforce_security() before linking recv_buf onto that list. On failure it calls ib_free_recv_mad(), which only walks rmpp_list and frees the ib_mad_private of every buffer found there. As the list is still empty at that point, nothing is freed at all. The caller cannot clean up either: ib_mad_recv_done() sets recv to NULL right after ib_mad_complete_recv() returns, assuming the MAD layer took ownership of the buffer. Every MAD that fails the PKey check therefore leaks one ib_mad_private (about 300 bytes per IB port MAD, ~2K for OPA), and a remote node can trigger this repeatedly by sending MADs with a wrong PKey. Link recv_buf onto rmpp_list right after the list is initialized, so the error path has something to free.

Published
Oct 6, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 5th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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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

    • 4.13affected
    • 47a2b338fe63200d716d2e24131cdb49f17c77da and later · before 4617c9a856188674dddb0ca66979746d07688579affected · git
    • 47a2b338fe63200d716d2e24131cdb49f17c77da and later · before 8e2036fb47a5b152d53eadbd35abf311bd34cc7faffected · git
    • 47a2b338fe63200d716d2e24131cdb49f17c77da and later · before bad289e42f512646a988f278f536d21547df73f1affected · git
    • 47a2b338fe63200d716d2e24131cdb49f17c77da and later · before 752b30e9d339008e5ce7eed412e9446078916129affected · git
    • 47a2b338fe63200d716d2e24131cdb49f17c77da and later · before 39c4ea72a40503e102ae07e6776005f96ca078a6affected · git
    • 47a2b338fe63200d716d2e24131cdb49f17c77da and later · before 5091e25ec503f7fc02723ca435226467b68caac7affected · git
    • 47a2b338fe63200d716d2e24131cdb49f17c77da and later · before c0d8df85db146d6275e226cb950023be69dd6c77affected · git
    • 47a2b338fe63200d716d2e24131cdb49f17c77da and later · before 3476c28c9addfa253f505e6bd87f1f5598b961d0affected · git
    • before 4.13not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.8-17.2.8-1

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-2026-98352Oct 6, 2026 · RDMA/rtrs-clt: Fix CQ pool leak when connect is interrupted
    0Monitor
  • ← EarlierCVE-2026-98353Oct 6, 2026 · RDMA/erdma: Use IRQ-safe XArray helpers for QP and CQ tables
    0Monitor
  • Later →CVE-2026-98355Oct 6, 2026 · RDMA/rtrs: guard against null kobj name
    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 Linux3476c28c9addfa253f505e6bd87f1f5598b961d0Vendor (CNA)
Linux Linux39c4ea72a40503e102ae07e6776005f96ca078a6Vendor (CNA)
Linux Linux4617c9a856188674dddb0ca66979746d07688579Vendor (CNA)
Linux Linux5091e25ec503f7fc02723ca435226467b68caac7Vendor (CNA)
Linux Linux752b30e9d339008e5ce7eed412e9446078916129Vendor (CNA)
Linux Linux8e2036fb47a5b152d53eadbd35abf311bd34cc7fVendor (CNA)
Linux Linuxbad289e42f512646a988f278f536d21547df73f1Vendor (CNA)
Linux Linuxc0d8df85db146d6275e226cb950023be69dd6c77Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.8-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · 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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 13, 2026+38 d
EPSS, last 120 days

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

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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.

References

Show all references (7 more)

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

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