CVE-2026-89656Critical· 9.8▾ MidnightIn 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…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 5.9
— → 9.8
none → critical
9.8 → 5.9
critical → medium
5.9 → 9.8
medium → critical
9.8 → 7
critical → high
0.2% → 0.8%
7 → 8.8
8.8 → 9.8
high → critical
Last analysed / modified upstream
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.
Linux >= 66a0e2d579dbec5c676cfe446234ffebb267c564 < ee59040d6ed1a5f8d10d27174b8f32c90ca8e89aLinux >= 66a0e2d579dbec5c676cfe446234ffebb267c564 < baad5875fdd2f5e248250fc3519bb045d64f1716Linux >= 66a0e2d579dbec5c676cfe446234ffebb267c564 < 4aeb93daadf388e72073abc204312dd364eeb30aLinux >= 66a0e2d579dbec5c676cfe446234ffebb267c564 < 6e5c6ce252b1eccfd41670a5cf95ab44f7ba7022Linux >= 66a0e2d579dbec5c676cfe446234ffebb267c564 < 3516a4131c4e45d62ee4e42e82c36930e8c1fbbdLinux >= 66a0e2d579dbec5c676cfe446234ffebb267c564 < 00562ccd4e88d092b9b851df50fad20442bfeb24Linux >= 66a0e2d579dbec5c676cfe446234ffebb267c564 < 79900d978158b2d80eef952fc41b9e4dc58d7b83Linux >= 66a0e2d579dbec5c676cfe446234ffebb267c564 < 3cde4a8302301679937474a5f7a851394cc1bd11Linux 4.11Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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