CVE-2026-89526
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
In the Linux kernel svcrdma module, the RPC/RDMA Read chunk position field is supplied by the remote client and stored verbatim. xdr_count_read_segments() checks only 4-byte alignment and never compares the position against the received inline body length, so in the single-chunk path a position past the inline body underflows the tail length and exposes adjacent slab memory, while in the multi-chunk path overlapping chunks cause unsigned underflows and copies past the receive buffer.
Risk Assessment
A remote attacker can expose kernel memory contents or corrupt memory, potentially leading to information disclosure or code execution. It affects servers running RDMA services.
Recommendation
Update the Linux kernel to a version with the fix that bounds inline-range copies in svc_rdma_copy_inline_range() against the saved RPC body and rejects single and multi-chunk Read lists with positions beyond the body or overlapping.
Other vulnerabilities in Linux kernel
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- CVE-2026-80917Unknown
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- CVE-2026-80916Unknown
A vulnerability in the Linux kernel's KCOV mechanism causes data corruption and race conditions on PREEMPT_RT systems. The issue stems from storing temporary KCOV state in per-CPU areas, which can be overwritten by nested softirq preemption. Additionally, under certain initialization conditions, it may lead to kernel panic or memory leaks.
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In the Linux kernel, the drm/xe driver's DPT allocation paths were fixed. The fallback from VRAM to system memory was removed as it did not work and caused black screen with pipe faults. Also, stolen memory usage is avoided due to latency and risk of random system hangs under load.
- CVE-2026-80886Unknown
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- CVE-2026-80885Unknown
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: svcrdma: Validate Read chunk positions before reconstruction The RPC/RDMA Read chunk position field is supplied by the remote client and stored verbatim in the parsed chunk list. xdr_count_read_segments() checks only 4-byte alignment; it never compares the position against the received inline body length. In the single-chunk path, svc_rdma_read_complete_one() splits the head and tail kvecs at ch_position. A position past the inline body underflows the tail length, exposing adjacent slab memory to the upper XDR decoder. In the multi-chunk path, svc_rdma_read_multiple_chunks() computes gap lengths between chunks as unsigned subtractions from ch_position. Overlapping Read chunks cause these subtractions to underflow. A final position past the inline body likewise underflows the trailing gap length. svc_rdma_copy_inline_range() then copies past the receive buffer into request pages that are returned to the client through the Reply channel. Bound inline-range copies in svc_rdma_copy_inline_range() against the decoded inline RPC body saved in rc_saved_arg. Reject a single Read chunk positioned beyond that body, and reject multi-chunk lists where accumulated read bytes exceed the next chunk's position. Apply the same position and overlap checks in the call-chunk interleaving path.