CVE-2026-89865

Kernel heap exposure via uninitialized SFP DMA buffer

Published Sep 16, 2026 · Updated Sep 16, 2026

Uninitialized-memory exposure in Linux qla2xxx allows attackers to write stale kernel heap data to adapter flash through crafted bsg payloads. Five FRU and I2C handlers allocate a 256-byte DMA buffer without zeroing it, initialize only a short prefix, and let qla2x00_write_sfp replace the transfer length with a payload byte of up to 255. Reachability requires a qla2xxx adapter and access to a FRU or I2C bsg handler; the published record does not specify the required host privileges.

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

What happened

Uninitialized-memory exposure in Linux qla2xxx allows attackers to write stale kernel heap data to adapter flash through crafted bsg payloads. Five FRU and I2C handlers allocate a 256-byte DMA buffer without zeroing it, initialize only a short prefix, and let qla2x00_write_sfp replace the transfer length with a payload byte of up to 255. Reachability requires a qla2xxx adapter and access to a FRU or I2C bsg handler; the published record does not specify the required host privileges.

The record

CVE
CVE-2026-89865
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=3.2
  2. Affected versionversion=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <09703bc7c0be3a7a155b0ff5f21f6765ba3f519c
  3. Affected versionversion=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <581590f560b74399151b3cbc88574424c2f3d2dc
  4. Affected versionversion=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <84bde5ce4038d9ad811e5c994305bbfcbd7a9f79
  5. Affected versionversion=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <97c45c75f5cdec96b1a4fba8b1d55d0dd01af1e8
  6. Affected versionversion=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <a476377a66897549dd49bee319f4df66623417b7
  7. Affected versionversion=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <a5501c42256235523c4dddf799f032dfbf4f4c77
  8. Affected versionversion=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <b157256c28086c434afd70cc78bf9b4d8caf1276
  9. Affected versionversion=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <b47d4a1547d9ef21b2e9d1a739fe2204d4be05dc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.2; version=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <09703bc7c0be3a7a155b0ff5f21f6765ba3f519c; version=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <581590f560b74399151b3cbc88574424c2f3d2dc; version=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <84bde5ce4038d9ad811e5c994305bbfcbd7a9f79; version=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <97c45c75f5cdec96b1a4fba8b1d55d0dd01af1e8; version=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <a476377a66897549dd49bee319f4df66623417b7; version=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <a5501c42256235523c4dddf799f032dfbf4f4c77; version=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <b157256c28086c434afd70cc78bf9b4d8caf1276; version=697a4bc69159c3396035b0506ffa55c4b2d0b1f4 <b47d4a1547d9ef21b2e9d1a739fe2204d4be05dc

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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