CVE-2026-89656
CVE CVE-2026-89656EUVD EUVD-2026-76568Published 2026-09-11T19:45:45.000ZLast changed 2026-09-14T12:01:50.000ZCVSS 9.8
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: libceph: reject buckets with mismatched CRUSH ids crush_decode() stores bucket data by array slot, and the mapper later derives the per-bucket workspace index from the decoded bucket id. A malformed map can therefore make one bucket reuse another bucket's workspace by encoding an id different from -1 - slot. For uniform buckets, the second replica selection expands the source bucket's permutation into that aliased workspace buffer. If the source bucket is larger than the aliased bucket, the write runs past the smaller permutation array and can escape the kvmalloc'd CRUSH workspace. KASAN reports a slab OOB write of 4 bytes in bucket_perm_choose(). Reject buckets whose encoded id does not match their array slot. Valid CRUSH maps already use the canonical negative id corresponding to the bucket slot, so this restores the invariant expected by work->work[-1 - in->id] without changing valid map behavior.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux 66a0e2d579dbec5c676cfe446234ffebb267c564 <3cde4a8302301679937474a5f7a851394cc1bd11; 66a0e2d579dbec5c676cfe446234ffebb267c564 <4aeb93daadf388e72073abc204312dd364eeb30a; 66a0e2d579dbec5c676cfe446234ffebb267c564 <baad5875fdd2f5e248250fc3519bb045d64f1716; patch: 5.15.221; 66a0e2d579dbec5c676cfe446234ffebb267c564 <79900d978158b2d80eef952fc41b9e4dc58d7b83; 4.11; 66a0e2d579dbec5c676cfe446234ffebb267c564 <00562ccd4e88d092b9b851df50fad20442bfeb24; patch: 5.10.270; patch: 7.2.4; patch: 6.18.50; patch: 7.3-rc1; patch: 6.6.157; 66a0e2d579dbec5c676cfe446234ffebb267c564 <6e5c6ce252b1eccfd41670a5cf95ab44f7ba7022; patch: 6.1.188; 66a0e2d579dbec5c676cfe446234ffebb267c564 <ee59040d6ed1a5f8d10d27174b8f32c90ca8e89a; patch: 6.12.109; patch: 0; 66a0e2d579dbec5c676cfe446234ffebb267c564 <3516a4131c4e45d62ee4e42e82c36930e8c1fbbd
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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