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CVE-2026-89458— s390/dasd: Do not complete a failed ESE read as successful

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存在安全漏洞，该漏洞源于s390/dasd驱动在完成未分配ESE磁道的NRF读取时，未检查ese_read()返回值即标记请求成功，导致块层获取陈旧或未初始化内存。

AI Predicted 6.5 Difficulty: Hard EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1565.002 · Transmitted Data Manipulation

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux 5e6bdd37c5526ef01326df5dabb93011ee89237e< 8cb96cffceead3cbd0541154d7ecc5e6474edda1 affected
5e6bdd37c5526ef01326df5dabb93011ee89237e< 77168af195d04b34c6de62b874624e74d64cef8d affected
5e6bdd37c5526ef01326df5dabb93011ee89237e< 921ff697bb6f7067059793becf8b2d00de71ce41 affected
5e6bdd37c5526ef01326df5dabb93011ee89237e< 55f4df40178cdfede0d7ae848fbab00efa9b95c1 affected
5e6bdd37c5526ef01326df5dabb93011ee89237e< c9adf8399732306dfc97b3adb4778038743e3f5e affected
5e6bdd37c5526ef01326df5dabb93011ee89237e< 52b331c99baac653ca794bd8487c8ec4de8db203 affected
5e6bdd37c5526ef01326df5dabb93011ee89237e< b0d94dd6e82df396e2254c8b0f25eff7d19c2e7f affected
5e6bdd37c5526ef01326df5dabb93011ee89237e< cddb447c62466f3076938ce120028d7b591f9f37 affected
… +14 more rows
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I. Basic Information for CVE-2026-89458

Vulnerability Information
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Vulnerability Title
s390/dasd: Do not complete a failed ESE read as successful
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/dasd: Do not complete a failed ESE read as successful dasd_int_handler() completes an NRF read of an unallocated ESE track by calling ese_read() and unconditionally marking the request DASD_CQR_SUCCESS. dasd_eckd_ese_read() can return an error before it has zeroed the destination buffer: a failed sense-data parse or a current track outside the requested range both return early, leaving the destination pages untouched. The request is still completed successfully, so the block layer is handed stale / uninitialized memory instead of zeros. Check the ese_read() return value and fail the request through the normal error path instead of forcing DASD_CQR_SUCCESS.
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
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存在安全漏洞，该漏洞源于s390/dasd驱动在完成未分配ESE磁道的NRF读取时，未检查ese_read()返回值即标记请求成功，导致块层获取陈旧或未初始化内存。
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 5e6bdd37c5526ef01326df5dabb93011ee89237e ~ 8cb96cffceead3cbd0541154d7ecc5e6474edda1 -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-89458

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III. Intelligence Information for CVE-2026-89458

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Patches & Fixes for CVE-2026-89458 (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

V. Comments for CVE-2026-89458

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