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CVE-2026-89573— dm array: reject an array block whose value size is not the caller's

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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 3.9版本存在安全漏洞，该漏洞源于dm-array中array_block_check()仅将头部与自身比较，未验证数组块的value size与调用者是否一致，可能导致element_at()以8字节步长遍历4字节条目并读取4096字节块的偏移8160处，造成越界读取。

CVSS 7.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 6513c29f44f2cc970c0e9fecfe5a6526c3e73025< 35cd3b278448c79614f65ab6bbc9ed348d847df9 affected
6513c29f44f2cc970c0e9fecfe5a6526c3e73025< a8237cb8fa0a628d903e76635bfdeae4202036b9 affected
6513c29f44f2cc970c0e9fecfe5a6526c3e73025< a530a9a419a7c5fdb7dae55ffa2dd7a130631842 affected
6513c29f44f2cc970c0e9fecfe5a6526c3e73025< 522fa26da24ccaa298ebe3c1c97395d2d63dfc21 affected
6513c29f44f2cc970c0e9fecfe5a6526c3e73025< 7bf4b5cb42a4e27f36bcbc6209d82a5da9c0168c affected
6513c29f44f2cc970c0e9fecfe5a6526c3e73025< ac4a5eb8b002a0742c938fc98b922e243f53573a affected
6513c29f44f2cc970c0e9fecfe5a6526c3e73025< cb409b38b0232ee4385ef55cddcd6fbdd011a8a2 affected
6513c29f44f2cc970c0e9fecfe5a6526c3e73025< 4538a287bdf5d0f9a379c678e5262b9f5783f547 affected
… +10 more rows
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I. Basic Information for CVE-2026-89573

Vulnerability Information
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Vulnerability Title
dm array: reject an array block whose value size is not the caller's
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dm array: reject an array block whose value size is not the caller's array_block_check() can only compare the header against itself, so a block with value_size 4 and max_entries 1018 is internally consistent and passes. dm-cache keeps two arrays -- mappings at 8 bytes and hints at 4 -- and the roots for both live in the superblock. Point the mappings root at a hint block and __load_mappings() walks it through an info whose value size is 8, so element_at() strides 8 bytes over 4-byte entries and reaches offset 8160 of a 4096-byte block. get_ablock() and __shadow_ablock() are the two places that hold the block and the caller at once. Reject there when the two value sizes disagree. Arrays only ever read their own blocks, so this fires on crafted metadata only.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 3.9版本存在安全漏洞，该漏洞源于dm-array中array_block_check()仅将头部与自身比较，未验证数组块的value size与调用者是否一致，可能导致element_at()以8字节步长遍历4字节条目并读取4096字节块的偏移8160处，造成越界读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 6513c29f44f2cc970c0e9fecfe5a6526c3e73025 ~ 35cd3b278448c79614f65ab6bbc9ed348d847df9 -
Linux Linux 3.9 -

II. Public POCs for CVE-2026-89573

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III. Intelligence Information for CVE-2026-89573

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Patches & Fixes for CVE-2026-89573 (8)

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

CVE-2026-89688 9.8 CRITICAL nfsd: drop the stateid, not the stateowner, on seqid_op replay retry
CVE-2026-89656 9.8 CRITICAL libceph: reject buckets with mismatched CRUSH ids
CVE-2026-89655 9.8 CRITICAL ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock
CVE-2026-89658 9.8 CRITICAL NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup
CVE-2026-89660 9.8 CRITICAL NFSD: Prevent client use-after-free during admin state revocation
CVE-2026-89659 9.8 CRITICAL NFSD: Prevent client use-after-free during delegation revoke
CVE-2026-89662 9.8 CRITICAL NFSD: Prevent lock owner use-after-free during client teardown
CVE-2026-89669 9.8 CRITICAL nfsd: initialize copy-notify stateid before publishing it
CVE-2026-89674 9.8 CRITICAL nfsd: fix XDR length calculation in nfsd4_ff_encode_layoutget
CVE-2026-89675 9.8 CRITICAL nfsd: fix UAF in async copy cancel and shutdown
CVE-2026-89676 9.8 CRITICAL nfsd: fix stale s2s_cp_stateids IDR entry for async COPY
CVE-2026-89677 9.8 CRITICAL nfsd: fix possible fh_compose of wrong dentry in nfsd4_create_file()
CVE-2026-89681 9.8 CRITICAL nfsd: fix layout fence worker double-reference race
CVE-2026-89686 9.8 CRITICAL nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke
CVE-2026-89703 9.8 CRITICAL nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations
CVE-2026-89479 9.8 CRITICAL sctp: stop processing a packet once its association is deleted
CVE-2026-89478 9.8 CRITICAL sctp: drop a chunk if its transport was removed
CVE-2026-89702 9.8 CRITICAL nfsd: size fh_verify server sockaddr slot by xpt_locallen
CVE-2026-89482 9.8 CRITICAL nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89708 9.8 CRITICAL nfsd: RCU-protect cl_cb_session to fix use-after-free on session teardown

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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