In the Linux kernel, the following vulnerability has been resolved:
SUNRPC: double free xprt_ctxt while still in use
When an RPC request is deferred, the rq_xprt_ctxt pointer is moved out of the svc_rqst into the svc_deferred_req. When the deferred request is revisited, the pointer is copied into the new svc_rqst - and also remains in the svc_deferred_req.
In the (rare?) case that the request is deferred a second time, the old svc_deferred_req is reused - it still has all the correct content. However in that case the rq_xprt_ctxt pointer is NOT cleared so that when xpo_release_xprt is called, the ctxt is freed (UDP) or possible added to a free list (RDMA). When the deferred request is revisited for a second time, it will reference this ctxt which may be invalid, and the free the object a second time which is likely to oops.
So change svc_defer() to *always* clear rq_xprt_ctxt, and assert that the value is now stored in the svc_deferred_req.
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 perfUpgrade kernel-toolsUpgrade kernel-debuginfoUpgrade perf-debuginfoUpgrade kernel-livepatch-5.15.117-72.142Upgrade kernel-debuginfo-common-aarch64Upgrade kernel-develUpgrade kernel-tools-develUpgrade kernelUpgrade kernel-debuginfo-common-x86_64Upgrade bpftool-debuginfoUpgrade kernel-headersUpgrade python-perfUpgrade python-perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade bpftool | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-toolsUpgrade perf-debuginfoUpgrade kernel-headersUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-libbpf-develUpgrade kernelUpgrade perfUpgrade bpftoolUpgrade kernel-tools-debuginfoUpgrade kernel-libbpfUpgrade python3-perf-debuginfoUpgrade kernel-livepatch-6.1.34-56.100Upgrade kernel-develUpgrade kernel-libbpf-staticUpgrade kernel-debuginfo-common-aarch64Upgrade python3-perfUpgrade kernel-debuginfoUpgrade kernel-tools-develUpgrade bpftool-debuginfo | Feb 20, 2026 | Dec 30, 2025 |
| Debian | — | Upgrade linux | Dec 31, 2025 | Dec 31, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 30, 2025 |
| Ubuntu | — | Upgrade linux-oracle-5.15Upgrade linux-ibm-5.15Upgrade linux-gcpUpgrade linux-nvidia-tegraUpgrade linux-intel-iot-realtimeUpgrade linux-ibmUpgrade linuxUpgrade linux-nvidia-tegra-igxUpgrade linux-nvidia-tegra-5.15Upgrade linux-azure-5.15Upgrade linux-gkeopUpgrade linux-lowlatencyUpgrade linux-xilinx-zynqmpUpgrade linux-gcp-5.15Upgrade linux-aws-5.15Upgrade linux-kvmUpgrade linux-lowlatency-hwe-5.15Upgrade linux-oracleUpgrade linux-bluefieldUpgrade linux-gkeUpgrade linux-raspiUpgrade linux-intel-iotg-5.15Upgrade linux-hwe-5.15Upgrade linux-realtimeUpgrade linux-riscv-5.15Upgrade linux-intel-iotgUpgrade linux-azureUpgrade linux-nvidiaUpgrade linux-awsUpgrade linux-azure-fde | Jan 6, 2026 | Jan 2, 2026 |
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