CVE-2026-68082: libceph: fix two unsafe bare decodes in decode_lockers()

highCVSS 8.2CVE-2026-68082

CSIRTS triage

vendor: Linux product: Linux Kernel Memory corruption

What: The libceph library contains unsafe bare decodes in the decode_lockers() function that can read beyond buffer boundaries.
Who is affected: Linux systems using Ceph storage with libceph, particularly those handling distributed locks.
Urgency: Unknown severity; unsafe decoding may cause crashes or information disclosure depending on attacker-controlled data.
Action: Apply Linux kernel patch fixing safe decoding in libceph decode_lockers().

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 8.2
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68082

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-2026-680820.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-68082	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownDSA-6466-1 linux - security updatedebian
medium[NEW] [medium] Linux Kernel: Multiple vulnerabilities enable denial of servicecert-bund
criticalCVE-2026-68082: In the Linux kernel, the following vulnerability has been resolved: libceph: fix two unsafe ba…nvd

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-2026-68433: In the Linux kernel, the following vulnerability has been resolved: libceph: bound get_version…nvd · 2026-08-12
mediumCVE-2026-68154: libceph: reject zero bucket types in crush_decodemsrc · 2026-08-11
mediumCVE-2026-68157: libceph: guard missing CRUSH type name lookupmsrc · 2026-08-11
lowCVE-2026-68433: libceph: bound get_version reply decode to front lenmsrc · 2026-08-11
criticalCVE-2026-68153: libceph: remove debugfs files before client teardownmsrc · 2026-08-11
mediumCVE-2026-68159: libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZEmsrc · 2026-08-11