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Fencer Vulns
high 8.9

CVE-2025-30156 json

Ceph: AES-CBC misuse in CephX and RADOSGW enables authentication bypass and credential forgery

published 2026-08-27 2 mo ago modified 2026-10-19 20 d ago also BIT-ceph-2025-30156 , EUVD-2025-210807 , GHSA-7q3q-3975-qw3q

cvss
8.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 0%
public exploits
0
none known

Summary

Ceph is an open-source distributed storage platform providing object, block, and file storage. In versions prior to 20.2.4 and 19.2.6, the CephX authentication protocol encrypts tickets with AES-128-CBC in an unauthenticated mode that uses a hard-coded initialization vector and no message authentication, allowing an attacker to forge credentials and gain cluster-wide access. Because the ciphertext is malleable and the monitor will encrypt attacker-chosen entity names, an attacker holding one low-privilege key and able to observe CephX traffic can use the monitor as an encryption oracle and splice ciphertext blocks into valid tickets for privileged entities such as Manager, MDS, and OSD. The same lack of authentication also lets an attacker with CephX permissions escalate privileges by flipping a single bit in a service ticket to set its allow_all field to true. This issue is fixed in versions 20.2.4 and 19.2.6.

Patch / fix

  • bitnami ceph 19.2.6, 20.2.4
  • linuxfoundation ceph 19.2.6, 20.2.4
  • redhat ceph 19.2.6, 20.2.4
  • ceph Debian 14 20.2.4+ds-1

debian advisories DEBIAN-CVE-2025-30156

  • ceph ceph storage 8.1 2:19.2.1-423.el9cp
  • cephadm ceph storage 8.1 2:19.2.1-423.el9cp
  • librbd1 ceph storage 8.1 2:19.2.1-423.el9cp
  • librgw2 ceph storage 8.1 2:19.2.1-423.el9cp
  • rbd-nbd ceph storage 8.1 2:19.2.1-423.el9cp
  • ceph-mib ceph storage 8.1 2:19.2.1-423.el9cp
  • ceph-base ceph storage 8.1 2:19.2.1-423.el9cp
  • ceph-fuse ceph storage 8.1 2:19.2.1-423.el9cp

red hat advisories RHSA-2026:79101RHSA-2026:27735RHSA-2026:27731RHSA-2026:27708RHSA-2026:18587RHSA-2026:18134

  • kernel AlmaLinux 10 6.12.0-211.7.1.el10_2
  • rv AlmaLinux 10 6.12.0-211.7.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.7.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.7.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.7.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.7.1.el10_2
  • kernel-64k AlmaLinux 10 6.12.0-211.7.1.el10_2
  • kernel-core AlmaLinux 10 6.12.0-211.7.1.el10_2

almalinux advisories ALSA-2026:18134ALSA-2026:18587

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-2025-30156 updated cvss 8.7

kernel: ceph: kernel: Ceph: exploit of hardcoded IVECs, in a misuse of AES, resulting in authentication bypass

  • Red Hat Ceph Storage 7 rgw, ceph, cephadm, librbd1, librgw2, rbd-nbd, +17 more Red Hat Ceph Storage 8 rgw, cephadm
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-core, kernel-tools, python3-perf, +17 more Red Hat Openshift Data Foundation 4 odf4/cephcsi-rhel9
    affected: workaround, no fix available
  • Red Hat Ceph Storage 7.1 rhceph/rhceph-7-rhel9 1791452477
    fixed: vendor fix RHSA-2026:83548
  • Red Hat Ceph Storage 8.1 rhceph/rhceph-8-rhel9 1791176990
    fixed: vendor fix RHSA-2026:79243
  • Red Hat Ceph Storage 8.1 Tools ceph 19.2.1-423.el9cp, cephadm 19.2.1-423.el9cp, librbd1 19.2.1-423.el9cp, librgw2 19.2.1-423.el9cp, rbd-nbd 19.2.1-423.el9cp, ceph-mib 19.2.1-423.el9cp, +17 more
    fixed: vendor fix RHSA-2026:79101
  • Red Hat Ceph Storage 9.2 rhceph/rhceph-9-rhel10 1790843527
    fixed: vendor fix RHSA-2026:86618
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.123.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.123.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.123.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.123.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.123.1.el9_6
    fixed: vendor fix RHSA-2026:27708
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.5.1.el9_8, perf 5.14.0-687.5.1.el9_8, rtla 5.14.0-687.5.1.el9_8, python3-perf 5.14.0-687.5.1.el9_8, kernel-devel-matched 5.14.0-687.5.1.el9_8, kernel-64k-devel-matched 5.14.0-687.5.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:18587
show 24 more
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.7.1.el10_2, perf 6.12.0-211.7.1.el10_2, rtla 6.12.0-211.7.1.el10_2, python3-perf 6.12.0-211.7.1.el10_2, kernel-devel-matched 6.12.0-211.7.1.el10_2, kernel-64k-devel-matched 6.12.0-211.7.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:18134
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) rv 5.14.0-427.132.1.el9_4, perf 5.14.0-427.132.1.el9_4, rtla 5.14.0-427.132.1.el9_4, kernel-devel-matched 5.14.0-427.132.1.el9_4, kernel-64k-devel-matched 5.14.0-427.132.1.el9_4, kernel-debug-devel-matched 5.14.0-427.132.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:27735
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.82.1.el10_0, perf 6.12.0-55.82.1.el10_0, rtla 6.12.0-55.82.1.el10_0, python3-perf 6.12.0-55.82.1.el10_0, kernel-devel-matched 6.12.0-55.82.1.el10_0, kernel-64k-devel-matched 6.12.0-55.82.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:27731
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.123.1.el9_6, perf 5.14.0-570.123.1.el9_6, rtla 5.14.0-570.123.1.el9_6, python3-perf 5.14.0-570.123.1.el9_6, kernel-devel-matched 5.14.0-570.123.1.el9_6, kernel-64k-devel-matched 5.14.0-570.123.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:27708
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.5.1.el9_8, kernel-64k 5.14.0-687.5.1.el9_8, kernel-core 5.14.0-687.5.1.el9_8, kernel-tools 5.14.0-687.5.1.el9_8, kernel-modules 5.14.0-687.5.1.el9_8, kernel-64k-core 5.14.0-687.5.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:18587
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.7.1.el10_2, kernel-64k 6.12.0-211.7.1.el10_2, kernel-core 6.12.0-211.7.1.el10_2, kernel-tools 6.12.0-211.7.1.el10_2, kernel-modules 6.12.0-211.7.1.el10_2, kernel-64k-core 6.12.0-211.7.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:18134
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool 7.3.0-427.132.1.el9_4, kernel 5.14.0-427.132.1.el9_4, kernel-64k 5.14.0-427.132.1.el9_4, kernel-core 5.14.0-427.132.1.el9_4, kernel-tools 5.14.0-427.132.1.el9_4, python3-perf 5.14.0-427.132.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:27735
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.82.1.el10_0, kernel-64k 6.12.0-55.82.1.el10_0, kernel-core 6.12.0-55.82.1.el10_0, kernel-tools 6.12.0-55.82.1.el10_0, kernel-modules 6.12.0-55.82.1.el10_0, kernel-64k-core 6.12.0-55.82.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:27731
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.123.1.el9_6, kernel-64k 5.14.0-570.123.1.el9_6, kernel-core 5.14.0-570.123.1.el9_6, kernel-tools 5.14.0-570.123.1.el9_6, kernel-modules 5.14.0-570.123.1.el9_6, kernel-64k-core 5.14.0-570.123.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:27708
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.5.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.5.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.5.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.5.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.5.1.el9_8
    fixed: vendor fix RHSA-2026:18587
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.7.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.7.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.7.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.7.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.7.1.el10_2
    fixed: vendor fix RHSA-2026:18134
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.82.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.82.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.82.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.82.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.82.1.el10_0
    fixed: vendor fix RHSA-2026:27731
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.5.1.el9_8, kernel-rt-64k 5.14.0-687.5.1.el9_8, kernel-rt-core 5.14.0-687.5.1.el9_8, kernel-rt-modules 5.14.0-687.5.1.el9_8, kernel-rt-64k-core 5.14.0-687.5.1.el9_8, kernel-rt-debug-core 5.14.0-687.5.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:18587
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.7.1.el10_2, kernel-rt-64k 6.12.0-211.7.1.el10_2, kernel-rt-core 6.12.0-211.7.1.el10_2, kernel-rt-modules 6.12.0-211.7.1.el10_2, kernel-rt-64k-core 6.12.0-211.7.1.el10_2, kernel-rt-debug-core 6.12.0-211.7.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:18134
  • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt 5.14.0-427.132.1.el9_4, kernel-rt-core 5.14.0-427.132.1.el9_4, kernel-rt-modules 5.14.0-427.132.1.el9_4, kernel-rt-debug-core 5.14.0-427.132.1.el9_4, kernel-rt-modules-core 5.14.0-427.132.1.el9_4, kernel-rt-debug-modules 5.14.0-427.132.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:27735
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.82.1.el10_0, kernel-rt-64k 6.12.0-55.82.1.el10_0, kernel-rt-core 6.12.0-55.82.1.el10_0, kernel-rt-modules 6.12.0-55.82.1.el10_0, kernel-rt-64k-core 6.12.0-55.82.1.el10_0, kernel-rt-debug-core 6.12.0-55.82.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:27731
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.123.1.el9_6, kernel-rt-64k 5.14.0-570.123.1.el9_6, kernel-rt-core 5.14.0-570.123.1.el9_6, kernel-rt-modules 5.14.0-570.123.1.el9_6, kernel-rt-64k-core 5.14.0-570.123.1.el9_6, kernel-rt-debug-core 5.14.0-570.123.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:27708
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.5.1.el9_8, kernel-rt-core 5.14.0-687.5.1.el9_8, kernel-rt-modules 5.14.0-687.5.1.el9_8, kernel-rt-debug-core 5.14.0-687.5.1.el9_8, kernel-rt-modules-core 5.14.0-687.5.1.el9_8, kernel-rt-debug-modules 5.14.0-687.5.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:18587
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.7.1.el10_2, kernel-rt-core 6.12.0-211.7.1.el10_2, kernel-rt-modules 6.12.0-211.7.1.el10_2, kernel-rt-debug-core 6.12.0-211.7.1.el10_2, kernel-rt-modules-core 6.12.0-211.7.1.el10_2, kernel-rt-debug-modules 6.12.0-211.7.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:18134
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt 5.14.0-427.132.1.el9_4, kernel-rt-kvm 5.14.0-427.132.1.el9_4, kernel-rt-core 5.14.0-427.132.1.el9_4, kernel-rt-modules 5.14.0-427.132.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.132.1.el9_4, kernel-rt-debug-core 5.14.0-427.132.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:27735
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.82.1.el10_0, kernel-rt-kvm 6.12.0-55.82.1.el10_0, kernel-rt-core 6.12.0-55.82.1.el10_0, kernel-rt-modules 6.12.0-55.82.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.82.1.el10_0, kernel-rt-debug-core 6.12.0-55.82.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:27731
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.123.1.el9_6, kernel-rt-kvm 5.14.0-570.123.1.el9_6, kernel-rt-core 5.14.0-570.123.1.el9_6, kernel-rt-modules 5.14.0-570.123.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.123.1.el9_6, kernel-rt-debug-core 5.14.0-570.123.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:27708
  • Red Hat Ceph Storage 7.1 rhceph/grafana-rhel9 1791450715, rhceph/keepalived-rhel9 1791453133, rhceph/snmp-notifier-rhel9 1791450035, rhceph/rhceph-haproxy-rhel9 1791452229, rhceph/rhceph-promtail-rhel9 1791451373 Red Hat Ceph Storage 8.1 rhceph/grafana-rhel9 1791176238, rhceph/keepalived-rhel9 1791175257, rhceph/oauth2-proxy-rhel9 1791176282, rhceph/snmp-notifier-rhel9 1791176336, rhceph/rhceph-haproxy-rhel9 1791176338, rhceph/rhceph-promtail-rhel9 1791176366 Red Hat Ceph Storage 9 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +19 more Red Hat Ceph Storage 9.2 rhceph/alloy-rhel10 1790774976, rhceph/grafana-rhel10 1790774121, rhceph/keepalived-rhel10 1790842990, rhceph/oauth2-proxy-rhel10 1790774021, rhceph/snmp-notifier-rhel10 1790773439, rhceph/rhceph-haproxy-rhel10 1790846345
    not affected: vulnerable code not present
  • Red Hat OpenStack Platform 18.0 rhoso/openstack-cinder-volume-rhel9
    not affected: vulnerable code not in execute path

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
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.09% chance of exploitation in the next 30 days, higher than 0% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.9 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
OSV 3.1 8.9 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

Affected packages

ecosystem package affected fixed in
bitnami ceph
<19.2.6
>=20.0.0, <20.2.4
19.2.6
20.2.4

Affected products

  • ceph ceph

Classification

Weakness
  • CWE-327 Use of a Broken or Risky Cryptographic Algorithm

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.