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CVE-2026-100075: RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-25 · updated 2026-10-19

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.

Affected products

• Linux kernel: from 4.7 before 5.10.270; from 5.11 before 5.15.221; from 5.16 before 6.1.188; from 6.2 before 6.6.157; from 6.7 before 6.12.110; from 6.13 before 6.18.52 — fixed in 5.10.270, 5.15.221, 6.1.188, 6.12.110, 6.18.52, 6.6.157

How to fix

Upgrade to a fixed version: Linux kernel 5.10.270, 5.15.221, 6.1.188, 6.12.110. Check the vendor advisory for mitigations.

References

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

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