CVE-2026-68157 libceph: guard missing CRUSH type name lookup
A null pointer dereference in the Linux kernel's libceph module allows attackers to cause a denial of service via malformed CRUSH map data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68157?
CVE-2026-68157 is a high-severity vulnerability in Linux, published on 10 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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 ]
Weakness: CWE-476
Which versions are affected by CVE-2026-68157?
How do I fix CVE-2026-68157?
Apply the vendor's patch.
Is CVE-2026-68157 being exploited?
There is no known exploitation of CVE-2026-68157 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68157, DEBIAN-CVE-2026-68157, GHSA-mr29-956m-24vp, UBUNTU-CVE-2026-68157.