Bug 2546401 (CVE-2026-98354)

Summary: CVE-2026-98354 kernel: RDMA/mad: Fix receive buffer leak when PKey enforcement fails
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Remote Direct Memory Access (RDMA) subsystem. A remote attacker can trigger a Denial of Service (DoS) by repeatedly sending Management Datagrams (MADs) containing an invalid partition key (PKey). Because the kernel does not properly track and free allocated receive buffers when partition security validation fails, these packets cause an unreleased memory buildup that can eventually exhaust available system memory.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-06 09:14:52 UTC 
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.
Comment 1 gkamathe 2026-10-07 06:50:11 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98354.mbox