CVE-2026-52957: libceph: Fix potential null-ptr-deref in decode_choose_args()

highCVSS 7.5CVE-2026-52957

CSIRTS triage

vendor: libceph product: libcephOther

What: There is a potential null pointer dereference in decode_choose_args().
Who is affected: Users of libceph.
Urgency: Remediation is urgent due to a high severity rating of 7.5.
Action: Update libceph to the latest version.

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

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-52957

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-2026-529570.53% 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-2026-52957	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownMultiple vulnerabilities in Debian LTS Linux kernel (July 10, 2026)cert-fr-avis
unknownMultiple vulnerabilities in SUSE Linux kernel (July 10, 2026)cert-fr-avis
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.

mediumCVE-2026-52954: libceph: handle rbtree insertion error 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