In the Linux kernel, the following vulnerability has been resolved:
NFSD: Protect against send buffer overflow in NFSv2 READ
Since before the git era, NFSD has conserved the number of pages held by each nfsd thread by combining the RPC receive and send buffers into a single array of pages. This works because there are no cases where an operation needs a large RPC Call message and a large RPC Reply at the same time.
Once an RPC Call has been received, svc_process() updates svc_rqst::rq_res to describe the part of rq_pages that can be used for constructing the Reply. This means that the send buffer (rq_res) shrinks when the received RPC record containing the RPC Call is large.
A client can force this shrinkage on TCP by sending a correctly- formed RPC Call header contained in an RPC record that is excessively large. The full maximum payload size cannot be constructed in that case.
CVSS Details
- CVSS 3.1 Base Score: 9.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernelUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-5.15.75-48.135Upgrade bpftoolUpgrade kernel-livepatch-4.14.355-280.698Upgrade kernel-develUpgrade bpftool-debuginfoUpgrade kernel-debuginfoUpgrade kernel-tools-develUpgrade kernel-headersUpgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade perfUpgrade perf-debuginfoUpgrade python-perfUpgrade kernel-tools | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Sep 22, 2025 | Sep 22, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade kernelUpgrade python3-perfUpgrade kernel-tools-libs | Jan 15, 2026 | Jan 13, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-tools-libsUpgrade kernelUpgrade bpftoolUpgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade python3-perf | Feb 3, 2026 | Jan 30, 2026 |
| Oracle_linux | — | Upgrade kernel | Feb 2, 2026 | Sep 18, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 18, 2025 |
| Ubuntu | — | Upgrade linux-nvidiaUpgrade linux-oracle-5.15Upgrade linux-gcpUpgrade linux-oracleUpgrade linux-intel-iotgUpgrade linux-gkeUpgrade linux-gcp-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-realtimeUpgrade linux-azure-5.15Upgrade linux-ibmUpgrade linux-intel-iotg-5.15Upgrade linux-aws-5.15Upgrade linux-riscv-5.15Upgrade linux-kvmUpgrade linux-hwe-5.15Upgrade linux-awsUpgrade linux-gkeopUpgrade linux-lowlatencyUpgrade linux-azureUpgrade linux-raspiUpgrade linux | Sep 26, 2025 | Sep 18, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 18, 2025 |
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