CVE-2026-68157
In the Linux kernel, the following vulnerability has been resolved:
libceph: guard missing CRUSH type name lookup
Localized read selection can walk a parent bucket whose name exists in
the CRUSH map while its type has no matching entry in type_names.
get_immediate_parent() then dereferences a NULL type_cn and passes an
invalid pointer into strcmp(), causing a null-ptr-deref.
Skip such malformed parent buckets unless both the bucket name and type
name metadata are present. This keeps malformed hierarchy data from
crashing locality lookup and safely falls back to "not local".
[ idryomov: add WARN_ON_ONCE ]
CSIRTS triage
- What
- Missing guard on CRUSH type name lookup can cause information disclosure or crash when processing cluster maps with invalid type IDs.
- Who is affected
- Systems running Ceph clients or daemons processing untrusted cluster map data.
- Urgency
- Moderate urgency; CVSS 5.5 indicates potential denial of service or information disclosure from malformed cluster maps.
- Action
- Apply libceph patch adding guards to CRUSH type name lookups.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.69% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 50% of all EPSS-scored CVEs.
Advisory coverage (2)
- mediumCVE-2026-68157: libceph: guard missing CRUSH type name lookupmsrc · 2026-08-11
- highCVE-2026-68157: In the Linux kernel, the following vulnerability has been resolved: libceph: guard missing CRU…nvd · 2026-08-10
External references
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