CVE-2026-89953

Memory exhaustion via leaked mtdoops page bitmaps

Published Sep 16, 2026 · Updated Sep 16, 2026

Memory leak in the Linux kernel mtdoops driver allows attackers to consume kernel memory by repeatedly re-registering an MTD device. mtdoops_notify_remove() leaves oops_page_used allocated, so mtdoops_notify_add() overwrites the only pointer with a new vmalloc bitmap after reattachment. Exposure requires mtdoops to remain loaded while its configured backing MTD device can disappear and return; ordinary static MTD configurations are not affected.

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

Memory leak in the Linux kernel mtdoops driver allows attackers to consume kernel memory by repeatedly re-registering an MTD device. mtdoops_notify_remove() leaves oops_page_used allocated, so mtdoops_notify_add() overwrites the only pointer with a new vmalloc bitmap after reattachment. Exposure requires mtdoops to remain loaded while its configured backing MTD device can disappear and return; ordinary static MTD configurations are not affected.

The record

CVE
CVE-2026-89953
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
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=2.6.33
  2. Affected versionversion=be95745f01677245a061a8f51473ef5ec8ad008e <1e5cd8bc902331ff801df88cbb299029ae062753
  3. Affected versionversion=be95745f01677245a061a8f51473ef5ec8ad008e <477d61d54e097e90f748aa18d013805abd56bcbd
  4. Affected versionversion=be95745f01677245a061a8f51473ef5ec8ad008e <698944132083d143ef965c0090ee14ba1d9e1a5f
  5. Affected versionversion=be95745f01677245a061a8f51473ef5ec8ad008e <8414f0e9f707226de20b48c7048179fd86d352fc
  6. Affected versionversion=be95745f01677245a061a8f51473ef5ec8ad008e <956e7da12c114f13c63d126ab1d79c3b6a819060
  7. Affected versionversion=be95745f01677245a061a8f51473ef5ec8ad008e <a91ac71e67c3e01ed9afd9841435bebb930293f8
  8. Affected versionversion=be95745f01677245a061a8f51473ef5ec8ad008e <d06f91a52af11630c9f7e487f6daf242ac310cb8
  9. Affected versionversion=be95745f01677245a061a8f51473ef5ec8ad008e <f25c804947e0a28c15e73da8e2e0db959cbed716

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.33; version=be95745f01677245a061a8f51473ef5ec8ad008e <1e5cd8bc902331ff801df88cbb299029ae062753; version=be95745f01677245a061a8f51473ef5ec8ad008e <477d61d54e097e90f748aa18d013805abd56bcbd; version=be95745f01677245a061a8f51473ef5ec8ad008e <698944132083d143ef965c0090ee14ba1d9e1a5f; version=be95745f01677245a061a8f51473ef5ec8ad008e <8414f0e9f707226de20b48c7048179fd86d352fc; version=be95745f01677245a061a8f51473ef5ec8ad008e <956e7da12c114f13c63d126ab1d79c3b6a819060; version=be95745f01677245a061a8f51473ef5ec8ad008e <a91ac71e67c3e01ed9afd9841435bebb930293f8; version=be95745f01677245a061a8f51473ef5ec8ad008e <d06f91a52af11630c9f7e487f6daf242ac310cb8; version=be95745f01677245a061a8f51473ef5ec8ad008e <f25c804947e0a28c15e73da8e2e0db959cbed716

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

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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

T1499Endpoint Denial of Service

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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