CVE-2026-93049: Linux kernel · mtd: mtdswap: Avoid freeing registered blktrans device twice
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in eec130fc9ffbbd08a5d5432683122b79aca2a726 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in eec130fc9ffbbd08a5d5432683122b79aca2a726, ecadb9137aeaa0615183f8d23eabea2b45c862f1, d5086911d532b82ca070d944aa08ddde00baefe4 +5
Exploitation evidence
Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
Description
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.
References
- git.kernel.org/stable/c/ecadb9137aeaa0615183f8d23eabea2b45c862f1 (opens in a new tab)
- git.kernel.org/stable/c/eec130fc9ffbbd08a5d5432683122b79aca2a726 (opens in a new tab)
- git.kernel.org/stable/c/d5086911d532b82ca070d944aa08ddde00baefe4 (opens in a new tab)
- git.kernel.org/stable/c/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c (opens in a new tab)
- git.kernel.org/stable/c/a82d93fcfdfd26af17049c34319dfdd079cd1901 (opens in a new tab)
- git.kernel.org/stable/c/5c349c533e72af2313c3be0f80a24d7407fa4777 (opens in a new tab)
- git.kernel.org/stable/c/37be7bc2c2d09c18e939da20224405864a0090b9 (opens in a new tab)
- git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87 (opens in a new tab)