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Fencer Vulns
critical 9.8

CVE-2025-38089 in the critical feed json

sunrpc: handle SVC_GARBAGE during svc auth processing as auth error

published 2025-06-30 16 mo ago modified 2026-10-15 24 d ago also EUVD-2025-19770

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 46%
public exploits
0
none known

Summary

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.

Patch / fix

  • Linux Linux 6.4, 6.6.95, 6.12.35, 6.15.4, 6.16
  • linux Debian 14, Debian 13 6.12.35-1

debian advisories DEBIAN-CVE-2025-38089

  • linux Ubuntu 24.04 LTS 6.8.0-100.100
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1046.49
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1047.50
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1043.48
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1044.44
  • linux-azure Ubuntu 24.04 LTS 6.8.0-1046.52
  • linux-gkeop Ubuntu 24.04 LTS 6.8.0-1030.33
  • linux-raspi Ubuntu 24.04 LTS 6.8.0-1047.51

ubuntu advisories UBUNTU-CVE-2025-38089

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kpatch-patch-5_14_0-570_17_1 RHEL 9 1-5.el9_6
  • kernel RHEL 10.0 6.12.0-55.22.1.el10_0
  • rv RHEL 10.0 6.12.0-55.22.1.el10_0
  • perf RHEL 10.0 6.12.0-55.22.1.el10_0
  • rtla RHEL 10.0 6.12.0-55.22.1.el10_0
  • libperf RHEL 10.0 6.12.0-55.22.1.el10_0
  • kernel-rt RHEL 10.0 6.12.0-55.22.1.el10_0
  • kernel-64k RHEL 10.0 6.12.0-55.22.1.el10_0

red hat advisories RHSA-2025:12976RHSA-2025:12977RHSA-2025:11810RHSA-2025:11428RHSA-2025:11411

  • kernel-rt Linux Micro 6.2 6.12.0-160000.6.1
  • kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-source SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.6.1
  • kernel-default-base SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1.160000.2.4
  • kernel-syms SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-obs-qa SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1
  • kernel-kvmsmall SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1

suse advisories SUSE-SU-2025:21074-1SUSE-SU-2025:21139-1SUSE-SU-2026:20560-1SUSE-SU-2025:21179-1SUSE-SU-2025:03575-1SUSE-SU-2025:03572-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.6.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-kvmsmall openSUSE Leap 16.0 6.12.0-160000.6.1

opensuse advisories openSUSE-SU-2025:20081-1

  • kernel AlmaLinux 9 5.14.0-570.28.1.el9_6
  • rv AlmaLinux 9 5.14.0-570.28.1.el9_6
  • perf AlmaLinux 9 5.14.0-570.28.1.el9_6
  • rtla AlmaLinux 9 5.14.0-570.28.1.el9_6
  • libperf AlmaLinux 9 5.14.0-570.28.1.el9_6
  • kernel-rt AlmaLinux 9 5.14.0-570.28.1.el9_6
  • kernel-64k AlmaLinux 9 5.14.0-570.28.1.el9_6
  • kernel-core AlmaLinux 9 5.14.0-570.28.1.el9_6

almalinux advisories ALSA-2025:11411ALSA-2025:11428

  • kernel Rocky Linux 9 5.14.0-570.28.1.el9_6
  • kernel Rocky Linux 10 6.12.0-55.22.1.el10_0

rocky linux advisories RLSA-2025:11411RLSA-2025:11428

  • kernel Azure Linux 3.0 6.6.96.1-1

azure linux advisories AZL-64398

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-38089 updated cvss 7.5

kernel: sunrpc: handle SVC_GARBAGE during svc auth processing as auth error

  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.79.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.79.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.79.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.79.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.79.1.el9_4
    fixed: vendor fix RHSA-2025:11810
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-570.28.1.el9_6, perf 5.14.0-570.28.1.el9_6, rtla 5.14.0-570.28.1.el9_6, python3-perf 5.14.0-570.28.1.el9_6, kernel-devel-matched 5.14.0-570.28.1.el9_6, kernel-64k-devel-matched 5.14.0-570.28.1.el9_6, +7 more
    fixed: vendor fix RHSA-2025:11411
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-55.22.1.el10_0, perf 6.12.0-55.22.1.el10_0, rtla 6.12.0-55.22.1.el10_0, python3-perf 6.12.0-55.22.1.el10_0, kernel-devel-matched 6.12.0-55.22.1.el10_0, kernel-64k-devel-matched 6.12.0-55.22.1.el10_0, +7 more
    fixed: vendor fix RHSA-2025:11428
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.79.1.el9_4, perf 5.14.0-427.79.1.el9_4, rtla 5.14.0-427.79.1.el9_4, kernel-devel-matched 5.14.0-427.79.1.el9_4, kernel-64k-devel-matched 5.14.0-427.79.1.el9_4, kernel-debug-devel-matched 5.14.0-427.79.1.el9_4, +6 more
    fixed: vendor fix RHSA-2025:11810
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-570.28.1.el9_6, kernel-64k 5.14.0-570.28.1.el9_6, kernel-core 5.14.0-570.28.1.el9_6, kernel-tools 5.14.0-570.28.1.el9_6, kernel-modules 5.14.0-570.28.1.el9_6, kernel-64k-core 5.14.0-570.28.1.el9_6, +28 more
    fixed: vendor fix RHSA-2025:11411
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-55.22.1.el10_0, kernel-64k 6.12.0-55.22.1.el10_0, kernel-core 6.12.0-55.22.1.el10_0, kernel-tools 6.12.0-55.22.1.el10_0, kernel-modules 6.12.0-55.22.1.el10_0, kernel-64k-core 6.12.0-55.22.1.el10_0, +27 more
    fixed: vendor fix RHSA-2025:11428
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.79.1.el9_4, kernel 5.14.0-427.79.1.el9_4, kernel-64k 5.14.0-427.79.1.el9_4, kernel-core 5.14.0-427.79.1.el9_4, kernel-tools 5.14.0-427.79.1.el9_4, python3-perf 5.14.0-427.79.1.el9_4, +33 more
    fixed: vendor fix RHSA-2025:11810
show 9 more
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-570.28.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.28.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.28.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.28.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.28.1.el9_6
    fixed: vendor fix RHSA-2025:11411
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-55.22.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.22.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.22.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.22.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.22.1.el10_0
    fixed: vendor fix RHSA-2025:11428
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-570.28.1.el9_6, kernel-rt-64k 5.14.0-570.28.1.el9_6, kernel-rt-core 5.14.0-570.28.1.el9_6, kernel-rt-modules 5.14.0-570.28.1.el9_6, kernel-rt-64k-core 5.14.0-570.28.1.el9_6, kernel-rt-debug-core 5.14.0-570.28.1.el9_6, +14 more
    fixed: vendor fix RHSA-2025:11411
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-55.22.1.el10_0, kernel-rt-64k 6.12.0-55.22.1.el10_0, kernel-rt-core 6.12.0-55.22.1.el10_0, kernel-rt-modules 6.12.0-55.22.1.el10_0, kernel-rt-64k-core 6.12.0-55.22.1.el10_0, kernel-rt-debug-core 6.12.0-55.22.1.el10_0, +14 more
    fixed: vendor fix RHSA-2025:11428
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.79.1.el9_4, kernel-rt-core 5.14.0-427.79.1.el9_4, kernel-rt-modules 5.14.0-427.79.1.el9_4, kernel-rt-debug-core 5.14.0-427.79.1.el9_4, kernel-rt-modules-core 5.14.0-427.79.1.el9_4, kernel-rt-debug-modules 5.14.0-427.79.1.el9_4, +4 more
    fixed: vendor fix RHSA-2025:11810
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-570.28.1.el9_6, kernel-rt-kvm 5.14.0-570.28.1.el9_6, kernel-rt-core 5.14.0-570.28.1.el9_6, kernel-rt-modules 5.14.0-570.28.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.28.1.el9_6, kernel-rt-debug-core 5.14.0-570.28.1.el9_6, +6 more
    fixed: vendor fix RHSA-2025:11411
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-55.22.1.el10_0, kernel-rt-kvm 6.12.0-55.22.1.el10_0, kernel-rt-core 6.12.0-55.22.1.el10_0, kernel-rt-modules 6.12.0-55.22.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.22.1.el10_0, kernel-rt-debug-core 6.12.0-55.22.1.el10_0, +6 more
    fixed: vendor fix RHSA-2025:11428
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.79.1.el9_4, kernel-rt-kvm 5.14.0-427.79.1.el9_4, kernel-rt-core 5.14.0-427.79.1.el9_4, kernel-rt-modules 5.14.0-427.79.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.79.1.el9_4, kernel-rt-debug-core 5.14.0-427.79.1.el9_4, +6 more
    fixed: vendor fix RHSA-2025:11810
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
24 d ago

Exploit prediction

0.56% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/keymaker-arch/NFSundown referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.