CVE-2026-52954: libceph: handle rbtree insertion error in decode_choose_args()

mediumCVSS 5.5CVE-2026-52954

CSIRTS triage

Other

What: This vulnerability relates to handling errors in the libceph library.
Who is affected: Deployments using the affected library are at risk.
Urgency: Remediation is medium priority due to a severity rating of 5.5.
Action: Update to a patched version of libceph.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-52954

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-529540.53% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-52954	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund

Recent advisories for libceph

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-52957: libceph: Fix potential null-ptr-deref in decode_choose_args()msrc · 2026-06-09
criticalCVE-2026-52956: libceph: Fix potential out-of-bounds access in __ceph_x_decrypt()msrc · 2026-06-09
highCVE-2026-52955: libceph: Fix potential out-of-bounds access in crush_decode()msrc · 2026-06-09
mediumCVE-2026-52958: libceph: Fix potential out-of-bounds access in osdmap_decode()msrc · 2026-06-09