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

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.

以下是该漏洞描述的中文翻译： 在 Linux 内核中，以下漏洞已得到修复： mtd: mtdoops: 在后端 MTD 设备移除时释放页位图 在配置的 MTD 设备注册时会分配 位图。 虽会从该设备解绑，但未释放该位图。若同一 MTD 设备随后再次注册，注册路径会分配新的位图并覆盖旧指针，导致每次移除/注册循环都会泄漏一个 vmalloc 分配的内存。 这种情况仅在后端 MTD 设备可能消失并重新注册、且 mtdoops 模块仍加载时才会显现，因此在常见的静态 MTD 场景下不会触发。 修复方案是在注销 dumpe

AI Predicted 4.4 Difficulty: Theoretical EPSS 0.21% · P10

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux be95745f01677245a061a8f51473ef5ec8ad008e< 477d61d54e097e90f748aa18d013805abd56bcbd affected
be95745f01677245a061a8f51473ef5ec8ad008e< a91ac71e67c3e01ed9afd9841435bebb930293f8 affected
be95745f01677245a061a8f51473ef5ec8ad008e< 698944132083d143ef965c0090ee14ba1d9e1a5f affected
be95745f01677245a061a8f51473ef5ec8ad008e< f25c804947e0a28c15e73da8e2e0db959cbed716 affected
be95745f01677245a061a8f51473ef5ec8ad008e< 8414f0e9f707226de20b48c7048179fd86d352fc affected
be95745f01677245a061a8f51473ef5ec8ad008e< d06f91a52af11630c9f7e487f6daf242ac310cb8 affected
be95745f01677245a061a8f51473ef5ec8ad008e< 1e5cd8bc902331ff801df88cbb299029ae062753 affected
be95745f01677245a061a8f51473ef5ec8ad008e< 956e7da12c114f13c63d126ab1d79c3b6a819060 affected
… +10 more rows
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I. Basic Information for CVE-2026-89953

Vulnerability Information
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Vulnerability Title
mtd: mtdoops: free page bitmap when the backing MTD is removed
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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 be95745f01677245a061a8f51473ef5ec8ad008e ~ 477d61d54e097e90f748aa18d013805abd56bcbd -
Linux Linux 2.6.33 -

II. Public POCs for CVE-2026-89953

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III. Intelligence Information for CVE-2026-89953

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Other References for CVE-2026-89953 (8)

Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total

CVE-2026-90048 9.8 CRITICAL fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()
CVE-2026-90012 9.8 CRITICAL spi: Fix DMA mapping ownership on partial map failure
CVE-2026-89970 9.8 CRITICAL nvmet-auth: Synchronize timeout work during SQ teardown
CVE-2026-89857 9.8 CRITICAL scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject
CVE-2026-89969 9.8 CRITICAL nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU
CVE-2026-89847 9.8 CRITICAL scsi: qla2xxx: Avoid double completion in async IOCB timeout
CVE-2026-89972 9.8 CRITICAL nvme: add missing SRCU grace period in error path
CVE-2026-89990 9.8 CRITICAL ceph: lock mutex in ceph_mds_check_access()
CVE-2026-90036 9.8 CRITICAL NFSD: Prevent client use-after-free during blocked-lock reaping
CVE-2026-90038 9.8 CRITICAL NFSD: Prevent client use-after-free during export state revocation
CVE-2026-90037 9.8 CRITICAL NFSD: Prevent client use-after-free during close_lru reaping
CVE-2026-89788 9.8 CRITICAL ksmbd: fix tree connection use-after-free in smb2_tree_connect()
CVE-2026-89783 9.8 CRITICAL xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
CVE-2026-90042 9.8 CRITICAL ceph: properly decrypt filenames in vmalloc() buffers
CVE-2026-89778 9.8 CRITICAL isofs: fix out-of-bounds page array access on empty zisofs block
CVE-2026-89915 9.3 CRITICAL KVM: arm64: Remove VM-wide VNCR mapping counter
CVE-2026-90049 9.3 CRITICAL net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()
CVE-2026-89775 9.3 CRITICAL KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation
CVE-2026-89916 9.3 CRITICAL KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry
CVE-2026-89930 9.3 CRITICAL KVM: nVMX: Service local TLB flushes on failed nested VM-Enter

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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