Linux Kernel up to 7.2.5 mtdswap mtdswap_add_mtd double free

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00+

Summaryinfo

A vulnerability marked as very critical has been reported in Linux Kernel up to 7.2.5. This issue affects the function mtdswap_add_mtd of the component mtdswap. Performing a manipulation results in double free. This vulnerability was named CVE-2026-93049. The attack needs to be approached locally. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.2.5. It has been classified as very critical. This affects the function mtdswap_add_mtd of the component mtdswap. The manipulation with an unknown input leads to a double free vulnerability. CWE is classifying the issue as CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-93049 since 09/17/2026. The exploitability is told to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/17/2026).

Upgrading to version 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch ecadb9137aeaa0615183f8d23eabea2b45c862f1/eec130fc9ffbbd08a5d5432683122b79aca2a726/d5086911d532b82ca070d944aa08ddde00baefe4/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c/a82d93fcfdfd26af17049c34319dfdd079cd1901/5c349c533e72af2313c3be0f80a24d7407fa4777/37be7bc2c2d09c18e939da20224405864a0090b9/779aa4c66a96bf43d2d62982ea1a9096a9128d87 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Double free
CWE: CWE-415 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.270/5.15.221/6.1.188/6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: ecadb9137aeaa0615183f8d23eabea2b45c862f1/eec130fc9ffbbd08a5d5432683122b79aca2a726/d5086911d532b82ca070d944aa08ddde00baefe4/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c/a82d93fcfdfd26af17049c34319dfdd079cd1901/5c349c533e72af2313c3be0f80a24d7407fa4777/37be7bc2c2d09c18e939da20224405864a0090b9/779aa4c66a96bf43d2d62982ea1a9096a9128d87

Timelineinfo

09/17/2026 Advisory disclosed
09/17/2026 +0 days CVE reserved
09/17/2026 +0 days VulDB entry created
09/17/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-93049 (🔒)
GCVE (CVE): GCVE-0-2026-93049
GCVE (VulDB): GCVE-100-407103

Entryinfo

Created: 09/17/2026 23:09
Changes: 09/17/2026 23:09 (59)
Complete: 🔍
Cache ID: 216::103

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