AZL-100646
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-100646.json
- JSON Data
- https://api.osv.dev/v1/vulns/AZL-100646
- Upstream
- Published
- 2026-09-11T20:19:29Z
- Modified
- 2026-09-13T06:06:36Z
- Summary
- CVE-2026-89481 affecting package kernel 6.6.150.1-1
- Details
-
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.
- References