CVE-2026-93049 — mtd: mtdswap: Avoid freeing registered blktrans device twice
In the Linux kernel, the following vulnerability has been resolved: mtd: mtdswap: Avoid freeing registered blktrans device twice In mtdswap_add_mtd(), debugfs setup failure after successful blktrans registration can free mbd_dev twice. add_mtd_blktrans_dev() initializes the blktrans device reference and publishes the disk. Once that succeeds, del_mtd_blktrans_dev() tears the disk down and drops the blktrans reference; when that reference reaches zero, blktrans_dev_release() frees the mtd_blktrans_dev. The debugfs failure path called del_mtd_blktrans_dev(mbd_dev), then fell through the common cleanup label and called kfree(mbd_dev) again. Clear the local pointer after deregistration so the common cleanup can still release the mtdswap state without freeing the blktrans object twice. This issue was found by a static analysis checker and confirmed by manual source review.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
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.
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 |
≥ e8e3edb95ce6a146bc774b6cfad3553f4383edc8 and < ecadb9137aeaa0615183f8d23eabea2b45c862f1≥ e8e3edb95ce6a146bc774b6cfad3553f4383edc8 and < eec130fc9ffbbd08a5d5432683122b79aca2a726≥ e8e3edb95ce6a146bc774b6cfad3553f4383edc8 and < d5086911d532b82ca070d944aa08ddde00baefe4≥ e8e3edb95ce6a146bc774b6cfad3553f4383edc8 and < 0ce48c6ddea1a8e675a2eb0221b62a9950788f3c≥ e8e3edb95ce6a146bc774b6cfad3553f4383edc8 and < a82d93fcfdfd26af17049c34319dfdd079cd1901≥ e8e3edb95ce6a146bc774b6cfad3553f4383edc8 and < 5c349c533e72af2313c3be0f80a24d7407fa4777≥ e8e3edb95ce6a146bc774b6cfad3553f4383edc8 and < 37be7bc2c2d09c18e939da20224405864a0090b9≥ e8e3edb95ce6a146bc774b6cfad3553f4383edc8 and < 779aa4c66a96bf43d2d62982ea1a9096a9128d87 and 1 moreversion 4.14 |
Vulnerable | CVE Program (cve.org) e CISA ADP |
EPSS over time FIRST
Oct 15, 2026 → Oct 16, 2026 · 2 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.
Timeline
What happened to this CVE, newest first.
- 2026
- Record published
- Affected products added · linux/linux
- Source status changed · → Received
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 15, 2026 – Oct 15, 2026
References
8 on the record
- git.kernel.org/stable/c/a82d93fcfdfd26af17049c34319dfdd079cd1901
- git.kernel.org/stable/c/eec130fc9ffbbd08a5d5432683122b79aca2a726
- git.kernel.org/stable/c/5c349c533e72af2313c3be0f80a24d7407fa4777
- git.kernel.org/stable/c/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c
- git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87
- git.kernel.org/stable/c/d5086911d532b82ca070d944aa08ddde00baefe4
- git.kernel.org/stable/c/ecadb9137aeaa0615183f8d23eabea2b45c862f1
- git.kernel.org/stable/c/37be7bc2c2d09c18e939da20224405864a0090b9
Elsewhere on this site
Related CVEs (same products)
- Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 2d
- Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 2d
- Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 3d
- Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 3d
- Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 3d
- Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 3d
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-2026-93049 is "mtd: mtdswap: Avoid freeing registered blktrans device twice", 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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