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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade kernel-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-develUpgrade kernel-tools-debuginfoUpgrade kernel-livepatch-5.15.75-48.135Upgrade kernelUpgrade bpftoolUpgrade kernel-livepatch-4.14.355-280.698Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-headersUpgrade perf-debuginfoUpgrade python-perf-debuginfoUpgrade kernel-toolsUpgrade python-perfUpgrade perf | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Sep 22, 2025 | Sep 22, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade kernel | Jan 15, 2026 | Jan 13, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-tools-libsUpgrade bpftoolUpgrade kernelUpgrade python3-perfUpgrade kernel-abi-stablelistsUpgrade kernel-tools | 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-raspiUpgrade linux-lowlatencyUpgrade linuxUpgrade linux-azureUpgrade linux-gkeopUpgrade linux-awsUpgrade linux-hwe-5.15Upgrade linux-gcp-5.15Upgrade linux-nvidiaUpgrade linux-ibmUpgrade linux-intel-iotg-5.15Upgrade linux-oracle-5.15Upgrade linux-gcpUpgrade linux-kvmUpgrade linux-oracleUpgrade linux-riscv-5.15Upgrade linux-azure-fdeUpgrade linux-aws-5.15Upgrade linux-gkeUpgrade linux-realtimeUpgrade linux-intel-iotgUpgrade linux-lowlatency-hwe-5.15Upgrade linux-azure-5.15 | 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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