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In the Linux kernel, the following vulnerability has been resolved:
nvme-tcp: fix host memory disclosure on R2T for a read command
nvme_tcp_handle_r2t() does not check the direction of the request the R2T refers to. A malicious controller can send an R2T for a READ and the host will answer it: nvme_tcp_setup_h2c_data_pdu() builds the H2CData header and nvme_tcp_try_send_data() sends the request's data buffer. That buffer is the READ destination, so its contents go to the controller.
The command then completes normally and nothing is logged.
Against a test controller that answers every READ with an R2T, a 4096 byte buffered read returned all 4096 bytes, split over two R2Ts. The pages contained stale kernel data, including an array of struct page pointers.
Reject an R2T for a request that is not a write.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade kernel-rt-coreUpgrade kernel-rt-debug-coreUpgrade kernel-debug-modules-extraUpgrade kernel-zfcpdump-modulesUpgrade kernel-rt-debug-modulesUpgrade kernel-rt-modules-extraUpgrade kernelUpgrade kernel-headersUpgrade kernel-rt-debugUpgrade kernel-cross-headersUpgrade kernel-debug-modulesUpgrade kernel-abi-stablelistsUpgrade kernel-debug-develUpgrade bpftoolUpgrade kernel-rt-develUpgrade kernel-tools-libsUpgrade kernel-tools-libs-develUpgrade kernel-rt-modulesUpgrade kernel-debugUpgrade perfUpgrade kernel-toolsUpgrade kernel-debug-coreUpgrade kernel-coreUpgrade python3-perfUpgrade kernel-develUpgrade kernel-modules-extraUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-modulesUpgrade kernel-zfcpdump-coreUpgrade kernel-docUpgrade kernel-zfcpdump-develUpgrade kernel-rt-debug-develUpgrade kernel-zfcpdumpUpgrade kernel-rtUpgrade kernel-rt-debug-modules-extra | Oct 11, 2026 | Oct 5, 2026 |
| Amazon_linux_2023 | — | Upgrade bpftool-debuginfoUpgrade kernel-modules-extra-commonUpgrade kernel-headersUpgrade kernel-livepatch-6.1.188-233.385Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-toolsUpgrade perfUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade perf-debuginfoUpgrade kernel-debuginfoUpgrade kernel-modules-extraUpgrade kernelUpgrade kernel-develUpgrade python3-perf-debuginfoUpgrade kernel-tools-develUpgrade bpftoolUpgrade python3-perf | Oct 13, 2026 | Sep 11, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Sep 30, 2026 | Sep 11, 2026 |
| Redhat_linux | — | No solution existsUpgrade kernel-rtUpgrade kernel | Sep 21, 2026 | Sep 11, 2026 |
| Rocky_linux | — | Upgrade kernel-tools-debuginfoUpgrade kernelUpgrade kernel-modules-coreUpgrade kernel-rt-develUpgrade rtlaUpgrade kernel-zfcpdump-debuginfoUpgrade kernel-develUpgrade python3-perfUpgrade kernel-modules-extraUpgrade kernel-debug-uki-virtUpgrade kernel-rt-coreUpgrade kernel-rt-debug-coreUpgrade kernel-zfcpdump-develUpgrade kernel-debuginfoUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-rt-debug-develUpgrade kernel-debugUpgrade kernel-rt-modules-extraUpgrade kernel-rt-debugUpgrade perfUpgrade kernel-rt-debug-kvmUpgrade kernel-debug-develUpgrade kernel-debug-coreUpgrade kernel-coreUpgrade kernel-rt-debug-debuginfoUpgrade kernel-rtUpgrade kernel-toolsUpgrade kernel-uki-virtUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-debuginfo-common-s390xUpgrade kernel-debug-debuginfoUpgrade kernel-rt-debug-modules-extraUpgrade kernel-modules-extra-matchedUpgrade kernel-debuginfo-common-x86_64Upgrade perf-debuginfoUpgrade kernel-debug-modules-coreUpgrade kernel-debug-devel-matchedUpgrade kernel-modulesUpgrade rvUpgrade kernel-devel-matchedUpgrade kernel-debug-modules-extraUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-tools-libs-develUpgrade kernel-tools-libsUpgrade kernel-rt-debug-modulesUpgrade bpftool-debuginfoUpgrade kernel-rt-modules-coreUpgrade kernel-rt-debuginfoUpgrade bpftoolUpgrade kernel-zfcpdump-modulesUpgrade kernel-rt-modulesUpgrade kernel-rt-debuginfo-common-x86_64Upgrade kernel-debug-modulesUpgrade python3-perf-debuginfoUpgrade libperf-debuginfoUpgrade kernel-zfcpdump-coreUpgrade kernel-uki-virt-addonsUpgrade libperfUpgrade kernel-zfcpdumpUpgrade kernel-rt-debug-modules-coreUpgrade kernel-rt-kvm | Sep 28, 2026 | Sep 26, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 21, 2026 | Sep 11, 2026 |
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