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CVE-2026-89656— libceph: reject buckets with mismatched CRUSH ids

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已解决以下漏洞： libceph：拒绝 CRUSH ID 不匹配的桶 通过数组槽位（array slot）存储桶数据，而映射器（mapper）随后根据解码后的桶 ID 推导每个桶的工作区（workspace）索引。因此，一个格式错误的映射（malformed map）可能通过编码一个与 不一致的 ID，使得某个桶复用另一个桶的工作区。 对于均匀桶（uniform buckets），第二个副本选择过程会将源桶的置换（permutation）扩展到该别名工作区缓冲区中。如果源桶比被别名桶更大，写

AI Predicted 7.8 Difficulty: Hard

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 66a0e2d579dbec5c676cfe446234ffebb267c564< 3516a4131c4e45d62ee4e42e82c36930e8c1fbbd affected
66a0e2d579dbec5c676cfe446234ffebb267c564< 00562ccd4e88d092b9b851df50fad20442bfeb24 affected
66a0e2d579dbec5c676cfe446234ffebb267c564< 79900d978158b2d80eef952fc41b9e4dc58d7b83 affected
66a0e2d579dbec5c676cfe446234ffebb267c564< 3cde4a8302301679937474a5f7a851394cc1bd11 affected
4.11 affected
< 4.11 unaffected
6.12.109≤ 6.12.* unaffected
6.18.50≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-89656

Vulnerability Information
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Vulnerability Title
libceph: reject buckets with mismatched CRUSH ids
Source: CVE Program / CVE List V5
Vulnerability Description
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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 66a0e2d579dbec5c676cfe446234ffebb267c564 ~ 3516a4131c4e45d62ee4e42e82c36930e8c1fbbd -
Linux Linux 4.11 -

II. Public POCs for CVE-2026-89656

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III. Intelligence Information for CVE-2026-89656

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Patches & Fixes for CVE-2026-89656 (4)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89491 ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
CVE-2026-89477 sctp: fix NULL deref on untransmitted RECONF completion
CVE-2026-89478 sctp: drop a chunk if its transport was removed
CVE-2026-89479 sctp: stop processing a packet once its association is deleted
CVE-2026-89480 nvme-tcp: reject a read that transferred too few bytes
CVE-2026-89482 nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89481 nvme-tcp: fix host memory disclosure on R2T for a read command
CVE-2026-89483 nvme: zero the discard fallback page
CVE-2026-89484 lockd: fix NULL dereference on lockowner allocation failure
CVE-2026-89485 lockd: pin next file across nlm_inspect_file lock-drop
CVE-2026-89486 ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()
CVE-2026-89487 openvswitch: only skb_tx_error() a packet we are about to drop
CVE-2026-89488 openvswitch: Fix CT limit teardown use-after-free
CVE-2026-89489 openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
CVE-2026-89500 ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
CVE-2026-89497 orangefs: skip leading spaces before parsing client debug masks
CVE-2026-89498 orangefs: fix double-free of trailer_buf on readdir copy failure
CVE-2026-89499 ring-buffer: Stop remote reader update when page swap fails
CVE-2026-89496 ocfs2: always run deallocs on copy-on-write completion
CVE-2026-89501 ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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