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CVE-2025-71068
svcrdma: bound check rq_pages index in inline path
Published 2026-01-13 (9 months ago) by the Linux kernel CNA. Subsystem net/sunrpc. Debian urgency: not yet assigned.
What to do, per Debian release
Debian's own status for CVE-2025-71068 in every release this site tracks, and what each one means in practice. Every status below is the one the Debian Security Team publishes for this CVE. source
| Release | Status | Version | What this means |
|---|---|---|---|
| Debian 12bookworm | vulnerable | 6.1.190-1 | No fix published anywhere yet, neither in Debian nor upstream for the series bookworm tracks. Watch the Debian tracker page for this CVE. Advisories for bookworm have historically landed a median of 23 days after publication. |
| Debian 13trixie | fixedDSA-6126-1 · 2026-02-09 · text | 6.12.69-1 | Update the kernel and reboot. DSA-6126-1 shipped the fix on 2026-02-09, in 6.12.69-1. A running kernel keeps the old code until the machine restarts. |
| Debian 14forky | fixed | 6.18.3-1 | Update the kernel and reboot. Fixed in 6.18.3-1. A running kernel keeps the old code until the machine restarts. |
| Debian unstablesid | fixed | 6.18.3-1 | Update the kernel and reboot. Fixed in 6.18.3-1. A running kernel keeps the old code until the machine restarts. |
The vulnerability
What the bug is
svc_rdma_copy_inline_range indexed rqstp->rq_pages[rc_curpage] without verifying rc_curpage stays within the allocated page array. Add guards before the first use and after advancing to a new page.
Where it lives
The fix touches these files. If the subsystem is one you do not use, the practical exposure is lower, though the package is still the vulnerable one.
net/sunrpc/xprtrdma/svc_rdma_rw.c
- What this is
- KERNEL NFSD, SUNRPC, AND LOCKD SERVERSMAINTAINERS section matched on net/sunrpc/ · linux-nfs@vger.kernel.org · Supported
- Kernel module
- rpcrdma
Check it on the machine
grep -wE 'CONFIG_SUNRPC|CONFIG_SUNRPC_XPRT_RDMA' /boot/config-$(uname -r)Reads the booted kernel's own configuration, on the machine and nowhere else. =y is built in, =m is a module, and an is not set line means the code is not there.
lsmod | grep -w rpcrdmaPrints a line if that module is loaded right now, and nothing if it is not. One that is not loaded can still be loaded later by anything that needs it.
Show whether Debian builds this, per release
Debian builds this as a loadable module. Every release below compiles it as a module on every flavour, so whether the code is in the running kernel depends on whether that module is loaded.
- bookworm, trixie, forky, sidm
- m
- a loadable module on every flavour - check lsmod, can be blacklisted
- Build switches
- CONFIG_SUNRPC, CONFIG_SUNRPC_XPRT_RDMA
- Reads as
- all on means the file is compiled; any one off means it is not.
From the configuration Debian publishes for every kernel flavour it builds. It covers only the architectures Debian ships a linux-config package for, and nothing about a kernel you built yourself. Debian's own status above stays authoritative about the source package.MAINTAINERS kbuild Makefiles Debian linux-config packages
Signals
- Published
- 2026-01-13 (9 months ago)source
- CVSS
- 9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsource recompute it - Attack vector
- network (AV:N)source
- EPSS
- 0.36%, higher than 27.9% of all CVEssource
- CISA KEV
- not listedthe KEV catalogue
- Debian urgency
- not yet assignedsource
- Subsystem
- net/sunrpc
Upstream fixes
The versions the CNA records as introducing and fixing this, and the commit for each. source
| Introduced | Fixed in | Commit |
|---|---|---|
| 5.11 | 5.15.198 | a22316f5e9a2 |
| 5.11 | 6.6.120 | 7ba826aae1d4 |
| 5.11 | 6.12.64 | 5f140b525180 |
| 5.11 | 6.18.3 | da1ccfc4c452 |
| 5.11 | 6.19 | d1bea0ce35b6 |
Debian advisories
| Advisory | Date | Shipped to | Debian |
|---|---|---|---|
| DSA-6126-1 | 2026-02-09 | trixie 6.12.69-1 | tracker |
Why the CNA scored it this way
Quoted from the kernel CNA's own scoring file, word for word. A highlighted metric carries the most severe value CVSS v3.1 defines for it, which is what pushes the score up. source
- AV:NAttack vector, network
- An unauthenticated RPC-over-RDMA peer can reach this through an enabled NFS/RDMA listener over routable iWARP or RoCE networks.
- AC:LAttack complexity, low
- Crafted Read-chunk positions and lengths deterministically exhaust rq_pages; the fault can occur before RDMA operations are posted or remote keys are validated.
- PR:NPrivileges required, none
- The vulnerable copy occurs while decoding and assembling the transport message, before svc_process() performs RPC or NFS authentication.
- UI:NUser interaction, none
- Sending the malicious RPC-over-RDMA message directly triggers the vulnerable path without victim action.
- S:UScope, unchanged
- The vulnerable NFS/RDMA service and the affected kernel resources belong to the same security authority.
- C:HConfidentiality impact, high
- The unchecked index is interpreted as a struct page pointer, while oversized inline ranges can also read beyond the receive buffer; successful exploitation can expose arbitrary kernel memory.
- I:HIntegrity impact, high
- Attacker-selected bytes are passed to memcpy with a destination derived from the unchecked page pointer, creating a potentially controlled kernel-memory write and control-flow-hijacking primitive.
- A:HAvailability impact, high
- The guaranteed invalid or NULL page-pointer path can produce a kernel fault, oops, or panic, and an unauthenticated peer can trigger it repeatedly.