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CVE-2026-93049— mtd: mtdswap: Avoid freeing registered blktrans device twice

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已修复： mtd: mtdswap：避免对已注册的 blktrans 设备执行两次释放操作 在 中，如果在成功注册 设备后， 初始化失败，可能会导致 被释放两次。 负责初始化 设备的引用并注册磁盘。一旦成功， 会拆卸磁盘并减少 引用计数；当引用计数降为零时， 会释放 对象。 在 初始化失败的代码路径中，程序调用了 ，随后进入通用清理标签，再次调用 ，从而导致该对象被释放两次。修复方式是：在注销操作完成后立即将本地指针置空（clear the local pointer），这样后续的通

AI Predicted 7.8 Difficulty: Hard EPSS 0.22% · P11

Possible ATT&CK Techniques 1 AI

T1202.003

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux e8e3edb95ce6a146bc774b6cfad3553f4383edc8< ecadb9137aeaa0615183f8d23eabea2b45c862f1 affected
e8e3edb95ce6a146bc774b6cfad3553f4383edc8< eec130fc9ffbbd08a5d5432683122b79aca2a726 affected
e8e3edb95ce6a146bc774b6cfad3553f4383edc8< d5086911d532b82ca070d944aa08ddde00baefe4 affected
e8e3edb95ce6a146bc774b6cfad3553f4383edc8< 0ce48c6ddea1a8e675a2eb0221b62a9950788f3c affected
e8e3edb95ce6a146bc774b6cfad3553f4383edc8< a82d93fcfdfd26af17049c34319dfdd079cd1901 affected
e8e3edb95ce6a146bc774b6cfad3553f4383edc8< 5c349c533e72af2313c3be0f80a24d7407fa4777 affected
e8e3edb95ce6a146bc774b6cfad3553f4383edc8< 37be7bc2c2d09c18e939da20224405864a0090b9 affected
e8e3edb95ce6a146bc774b6cfad3553f4383edc8< 779aa4c66a96bf43d2d62982ea1a9096a9128d87 affected
… +10 more rows
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I. Basic Information for CVE-2026-93049

Vulnerability Information
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Vulnerability Title
mtd: mtdswap: Avoid freeing registered blktrans device twice
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux e8e3edb95ce6a146bc774b6cfad3553f4383edc8 ~ ecadb9137aeaa0615183f8d23eabea2b45c862f1 -
Linux Linux 4.14 -

II. Public POCs for CVE-2026-93049

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III. Intelligence Information for CVE-2026-93049

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Patches & Fixes for CVE-2026-93049 (8)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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