CVE-2026-89854

Local use-after-free via concurrent sysfs read

Published Sep 16, 2026 · Updated Sep 16, 2026

Use-after-free in the Linux qla2xxx driver allows local users to trigger invalid memory access by reading a sysfs attribute during host teardown. qla84xx_put_chip frees ha->cs84xx before scsi_remove_host removes 84xx_fw_version, so its show callback dereferences the stale pointer. Reachability requires a cs84xx-backed adapter and a read concurrent with driver teardown; no further consequence is publicly documented.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Use-after-free in the Linux qla2xxx driver allows local users to trigger invalid memory access by reading a sysfs attribute during host teardown. qla84xx_put_chip frees ha->cs84xx before scsi_remove_host removes 84xx_fw_version, so its show callback dereferences the stale pointer. Reachability requires a cs84xx-backed adapter and a read concurrent with driver teardown; no further consequence is publicly documented.

The record

CVE
CVE-2026-89854
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.14
  2. Affected versionversion=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <122bf170c94a3797531b12fee580639a5dc893ed
  3. Affected versionversion=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <1d8bbc4344b9367d9d54731475d745fbc9ea28f2
  4. Affected versionversion=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <2c3b17ee53f034936f7398dbf4d143e608b7c35c
  5. Affected versionversion=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <33d102102d925357c5fd172dd6672a27d74b3215
  6. Affected versionversion=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <8286a9095fb59751fba171afa2b4f590271c87d5
  7. Affected versionversion=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <8c1ebcade6aac58137f2645b579894301febabf3
  8. Affected versionversion=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <ae09260be7454ed7630a913f147591a25e3a9d09
  9. Affected versionversion=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <fcf0804dfe05862007189ac9dc4dc2063be36de1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.14; version=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <122bf170c94a3797531b12fee580639a5dc893ed; version=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <1d8bbc4344b9367d9d54731475d745fbc9ea28f2; version=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <2c3b17ee53f034936f7398dbf4d143e608b7c35c; version=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <33d102102d925357c5fd172dd6672a27d74b3215; version=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <8286a9095fb59751fba171afa2b4f590271c87d5; version=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <8c1ebcade6aac58137f2645b579894301febabf3; version=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <ae09260be7454ed7630a913f147591a25e3a9d09; version=fe1b806f4f7172b1eae18ddeebb7d8fb351043f7 <fcf0804dfe05862007189ac9dc4dc2063be36de1

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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