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CVE-2026-89854— scsi: qla2xxx: Fix cs84xx use-after-free on host teardown

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，以下漏洞已得到修复： SCSI: qla2xxx: 修复主机拆除（teardown）过程中 cs84xx 的释放后使用（use-after-free）问题 函数在通过 释放 的最后一个引用时，并未将 指针置空。该函数原本在 之前执行，而 负责移除 这个主机 sysfs 属性。 在两者执行之间的时间窗口内，如果对 属性进行并发读取，会触发 函数，该函数会解引用已经释放的 ，从而导致释放后使用（use-after-free）错误。 修复方法： 将 的调用位置移动到 之后，分别在 和 中调整执行顺

CVSS 7.8 · High EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux fe1b806f4f7172b1eae18ddeebb7d8fb351043f7< 8c1ebcade6aac58137f2645b579894301febabf3 affected
fe1b806f4f7172b1eae18ddeebb7d8fb351043f7< 1d8bbc4344b9367d9d54731475d745fbc9ea28f2 affected
fe1b806f4f7172b1eae18ddeebb7d8fb351043f7< 2c3b17ee53f034936f7398dbf4d143e608b7c35c affected
fe1b806f4f7172b1eae18ddeebb7d8fb351043f7< ae09260be7454ed7630a913f147591a25e3a9d09 affected
fe1b806f4f7172b1eae18ddeebb7d8fb351043f7< fcf0804dfe05862007189ac9dc4dc2063be36de1 affected
fe1b806f4f7172b1eae18ddeebb7d8fb351043f7< 8286a9095fb59751fba171afa2b4f590271c87d5 affected
fe1b806f4f7172b1eae18ddeebb7d8fb351043f7< 122bf170c94a3797531b12fee580639a5dc893ed affected
fe1b806f4f7172b1eae18ddeebb7d8fb351043f7< 33d102102d925357c5fd172dd6672a27d74b3215 affected
… +10 more rows
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I. Basic Information for CVE-2026-89854

Vulnerability Information
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Vulnerability Title
scsi: qla2xxx: Fix cs84xx use-after-free on host teardown
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Fix cs84xx use-after-free on host teardown qla84xx_put_chip() drops the last reference to ha->cs84xx and frees it via __qla84xx_chip_release() without clearing ha->cs84xx. During teardown it ran before scsi_remove_host(), which is what removes the 84xx_fw_version host sysfs attribute. A concurrent read of that attribute in the window between the two calls executes qla24xx_84xx_fw_version_show(), which dereferences the freed ha->cs84xx, resulting in a use-after-free. Move qla84xx_put_chip() to after scsi_remove_host() in both qla2x00_remove_one() and qla2x00_disable_board_on_pci_error(). Once scsi_remove_host() returns, the sysfs attribute is gone and kernfs has drained any in-flight show(), so no reader can touch cs84xx; the put still runs before the host and ha are freed.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 ~ 8c1ebcade6aac58137f2645b579894301febabf3 -
Linux Linux 3.14 -

II. Public POCs for CVE-2026-89854

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III. Intelligence Information for CVE-2026-89854

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Other References for CVE-2026-89854 (8)

Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total

CVE-2026-90048 9.8 CRITICAL fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()
CVE-2026-90012 9.8 CRITICAL spi: Fix DMA mapping ownership on partial map failure
CVE-2026-89970 9.8 CRITICAL nvmet-auth: Synchronize timeout work during SQ teardown
CVE-2026-89857 9.8 CRITICAL scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject
CVE-2026-89969 9.8 CRITICAL nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU
CVE-2026-89847 9.8 CRITICAL scsi: qla2xxx: Avoid double completion in async IOCB timeout
CVE-2026-89972 9.8 CRITICAL nvme: add missing SRCU grace period in error path
CVE-2026-89990 9.8 CRITICAL ceph: lock mutex in ceph_mds_check_access()
CVE-2026-90036 9.8 CRITICAL NFSD: Prevent client use-after-free during blocked-lock reaping
CVE-2026-90038 9.8 CRITICAL NFSD: Prevent client use-after-free during export state revocation
CVE-2026-90037 9.8 CRITICAL NFSD: Prevent client use-after-free during close_lru reaping
CVE-2026-89788 9.8 CRITICAL ksmbd: fix tree connection use-after-free in smb2_tree_connect()
CVE-2026-89783 9.8 CRITICAL xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
CVE-2026-90042 9.8 CRITICAL ceph: properly decrypt filenames in vmalloc() buffers
CVE-2026-89778 9.8 CRITICAL isofs: fix out-of-bounds page array access on empty zisofs block
CVE-2026-89915 9.3 CRITICAL KVM: arm64: Remove VM-wide VNCR mapping counter
CVE-2026-90049 9.3 CRITICAL net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()
CVE-2026-89775 9.3 CRITICAL KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation
CVE-2026-89916 9.3 CRITICAL KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry
CVE-2026-89930 9.3 CRITICAL KVM: nVMX: Service local TLB flushes on failed nested VM-Enter

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-89854

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