CVE-2026-89530Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: svcrdma: Reject inline replies that overflow the pull-up buffer An RPC-over-RDMA client can request a reply, such as an NFS READ payload, without providing a Write lis…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 8.1
— → 9.8
none → critical
9.8 → 8.1
critical → high
8.1 → 9.8
high → critical
9.8 → 8.1
critical → high
8.1 → 7
0.2% → 0.7%
7 → 9.8
high → critical
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
svcrdma: Reject inline replies that overflow the pull-up buffer
An RPC-over-RDMA client can request a reply, such as an NFS READ payload, without providing a Write list or a Reply chunk to carry it. When such a reply needs more scatter/gather entries than the device's Send Queue supports, svc_rdma_pull_up_needed() selects pull-up and svc_rdma_pull_up_reply_msg() linearizes the whole reply into sctxt->sc_xprt_buf. That buffer is only sc_max_req_size bytes, while the reply on this path is bounded only by the client's request, so svc_rdma_xb_linearize() copies past the end of the buffer and corrupts adjacent slab memory. The oversized length is then stored in sc_sges[0].length and posted, so the device also reads beyond the mapped region.
The SGE-exhaustion branch is the only pull-up path that can exceed the buffer: the threshold branch pulls up only replies smaller than RPCRDMA_PULLUP_THRESH, and replies that fit the device's SGE budget are sent directly without linearization. Make svc_rdma_pull_up_needed() report -E2BIG when the reply it would pull up cannot fit sc_max_req_size, and fail the request with ERR_CHUNK as RFC 8166 Section 4.5.3 directs rather than dropping the connection.
The helper no longer answers a simple yes/no question: it now reports pull-up, no pull-up, or -E2BIG for a reply too large to linearize. Rename svc_rdma_pull_up_needed() to svc_rdma_check_pull_up() so its name no longer implies a boolean predicate.
Linux >= e248aa7be86e8179f20ac0931774ecd746f3f5bf < 8068358f445a11296328ffa7c524701596814a17Linux >= e248aa7be86e8179f20ac0931774ecd746f3f5bf < fcd91b9957462d398792201c239dffaeff1cc8b2Linux >= e248aa7be86e8179f20ac0931774ecd746f3f5bf < 1949dd1576f7a8aa161b1330c6125df9d53046d5Linux >= e248aa7be86e8179f20ac0931774ecd746f3f5bf < 8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cfLinux >= e248aa7be86e8179f20ac0931774ecd746f3f5bf < 0fbe20dfe74b783d255bf389a6ea77aa25dc7860Linux 9b65b18f817d9ada2bf67351f24bdcce6789a0bbLinux d564356e1919d1178568c19af410cfc1a9076663Linux >= 4.19.22 < 4.20Linux >= 4.20.9 < 4.21Linux 5.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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