CVE-2026-98354: Linux kernel · RDMA/mad: Fix receive buffer leak when PKey enforcement fails
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 01:28 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 6 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
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.
References
- ubuntu.com/security/CVE-2026-98354 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98354 (opens in a new tab)
- git.kernel.org/linus/3476c28c9addfa253f505e6bd87f1f5598b961d0 (opens in a new tab)
- git.kernel.org/stable/c/3476c28c9addfa253f505e6bd87f1f5598b961d0 (opens in a new tab)
- git.kernel.org/stable/c/39c4ea72a40503e102ae07e6776005f96ca078a6 (opens in a new tab)
- git.kernel.org/stable/c/4617c9a856188674dddb0ca66979746d07688579 (opens in a new tab)
- git.kernel.org/stable/c/5091e25ec503f7fc02723ca435226467b68caac7 (opens in a new tab)
- git.kernel.org/stable/c/752b30e9d339008e5ce7eed412e9446078916129 (opens in a new tab)
- git.kernel.org/stable/c/8e2036fb47a5b152d53eadbd35abf311bd34cc7f (opens in a new tab)
- git.kernel.org/stable/c/bad289e42f512646a988f278f536d21547df73f1 (opens in a new tab)
- git.kernel.org/stable/c/c0d8df85db146d6275e226cb950023be69dd6c77 (opens in a new tab)