Critical 9.8Published Jun 30, 2025

CVE-2025-38089sunrpc: handle SVC_GARBAGE during svc auth processing as auth error

Updated under an hour ago (Oct 27, 2026, 8:40 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: sunrpc: handle SVC_GARBAGE during svc auth processing as auth error tianshuo han reported a remotely-triggerable crash if the client sends a kernel RPC server a specially crafted packet. If decoding the RPC reply fails in such a way that SVC_GARBAGE is returned without setting the rq_accept_statp pointer, then that pointer can be dereferenced and a value stored there. If it's the first time the thread has processed an RPC, then that pointer will be set to NULL and the kernel will crash. In other cases, it could create a memory scribble. The server sunrpc code treats a SVC_GARBAGE return from svc_authenticate or pg_authenticate as if it should send a GARBAGE_ARGS reply. RFC 5531 says that if authentication fails that the RPC should be rejected instead with a status of AUTH_ERR. Handle a SVC_GARBAGE return as an AUTH_ERROR, with a reason of AUTH_BADCRED instead of returning GARBAGE_ARGS in that case. This sidesteps the whole problem of touching the rpc_accept_statp pointer in this situation and avoids the crash.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 29cd2927fb914cc53b5ba4f67d2b74695c994ba4 before 599c489eea793821232a2f69a00fa57d82b0ac98; from 29cd2927fb914cc53b5ba4f67d2b74695c994ba4 before 353e75b55e583635bf71cde6abcec274dba05edd; from 29cd2927fb914cc53b5ba4f67d2b74695c994ba4 before c90459cd58bb421d275337093d8e901e0ba748dd; from 29cd2927fb914cc53b5ba4f67d2b74695c994ba4 before 94d10a4dba0bc482f2b01e39f06d5513d0f75742; 9b59f5c4911e87264507e0934cd2bb277390c560; from 6.3.4 before 6.4	CNA record
linux linux_kernel linux:linux_kernel	from 6.3.4 before 6.4; from 6.4.1 before 6.6.95; from 6.7 before 6.12.35; from 6.13 before 6.15.4; 6.4; 6.4; 6.4; 6.4; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/599c489eea793821232a2f69a00fa57d82b0ac98	patch
https://git.kernel.org/stable/c/353e75b55e583635bf71cde6abcec274dba05edd	patch
https://git.kernel.org/stable/c/c90459cd58bb421d275337093d8e901e0ba748dd	patch
https://git.kernel.org/stable/c/94d10a4dba0bc482f2b01e39f06d5513d0f75742	patch
https://www.openwall.com/lists/oss-security/2025/07/02/2	mailing-list
https://github.com/keymaker-arch/NFSundown	exploit, patch
http://www.openwall.com/lists/oss-security/2025/07/02/2	mailing-list

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.