Unknown

CVE-2026-89953 — mtd: mtdoops: free page bitmap when the backing MTD is removed

In the Linux kernel, the following vulnerability has been resolved: mtd: mtdoops: free page bitmap when the backing MTD is removed mtdoops_notify_add() allocates oops_page_used when the configured MTD device is registered. mtdoops_notify_remove() detaches from that device but leaves the bitmap allocated. If the same MTD device is later registered again, the add path allocates a new bitmap and overwrites the old pointer, leaking one vmalloc allocation per remove/add cycle. This is only visible when the backing MTD device can disappear and be registered again while mtdoops remains loaded, so the usual static MTD case does not expose it. Free the bitmap after unregistering the dumper and flushing the pending workers, then clear the pointer and page count before a later attach can allocate fresh state. Clearing the pointer also keeps the module exit path from freeing the same bitmap a second time after a remove event.

Published Sep 16, 2026 · Updated Oct 19, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.21%

ahead of 11% of scored CVEs · Oct 19, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ be95745f01677245a061a8f51473ef5ec8ad008e and < 477d61d54e097e90f748aa18d013805abd56bcbd≥ be95745f01677245a061a8f51473ef5ec8ad008e and < a91ac71e67c3e01ed9afd9841435bebb930293f8≥ be95745f01677245a061a8f51473ef5ec8ad008e and < 698944132083d143ef965c0090ee14ba1d9e1a5f≥ be95745f01677245a061a8f51473ef5ec8ad008e and < f25c804947e0a28c15e73da8e2e0db959cbed716≥ be95745f01677245a061a8f51473ef5ec8ad008e and < 8414f0e9f707226de20b48c7048179fd86d352fc≥ be95745f01677245a061a8f51473ef5ec8ad008e and < d06f91a52af11630c9f7e487f6daf242ac310cb8≥ be95745f01677245a061a8f51473ef5ec8ad008e and < 1e5cd8bc902331ff801df88cbb299029ae062753≥ be95745f01677245a061a8f51473ef5ec8ad008e and < 956e7da12c114f13c63d126ab1d79c3b6a819060 and 1 more version 2.6.33	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 19, 2026 · 4 reading(s) · max 0.21%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 16, 2026
Affected products added · linux/linux
Oct 16, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 16, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 19, 2026 – Oct 19, 2026
1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

10 on the record

git.kernel.org/stable/c/698944132083d143ef965c0090ee14ba1d9e1a5f
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-89953
GitHub Security Advisories
git.kernel.org/stable/c/956e7da12c114f13c63d126ab1d79c3b6a819060
NIST National Vulnerability Database
git.kernel.org/stable/c/f25c804947e0a28c15e73da8e2e0db959cbed716
NIST National Vulnerability Database
git.kernel.org/stable/c/1e5cd8bc902331ff801df88cbb299029ae062753
NIST National Vulnerability Database
git.kernel.org/stable/c/477d61d54e097e90f748aa18d013805abd56bcbd
NIST National Vulnerability Database
git.kernel.org/stable/c/a91ac71e67c3e01ed9afd9841435bebb930293f8
NIST National Vulnerability Database
github.com/advisories/GHSA-wvj7-v5wh-67w6
GitHub Security Advisories
git.kernel.org/stable/c/d06f91a52af11630c9f7e487f6daf242ac310cb8
NIST National Vulnerability Database
git.kernel.org/stable/c/8414f0e9f707226de20b48c7048179fd86d352fc
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-98866 sched/cache: Introduce task_struct->sched_cache_grp to fix UAF 1d
Unknown CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 1d
Unknown CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 1d
Unknown CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 1d
Unknown CVE-2026-98857 ipvs: bound LBLCR and LBLC cache growth 1d
Unknown CVE-2026-98858 io_uring: fix task_work add use-after-free with SQPOLL 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-89953 is "mtd: mtdoops: free page bitmap when the backing MTD is removed", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.21% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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