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CVE-2026-89993— dmaengine: dw-edma: Initialize IRQ data before requesting IRQs

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，已修复以下漏洞： dmaengine: dw-edma: 在请求 IRQ 之前初始化 IRQ 数据 dw_edma_irq_request() 在 dw_edma_channel_setup() 填充反向指针之前，就将 struct dw_edma_irq 传入了 request_irq()。因此，共享中断可能在 dw_irq->dw 仍为 NULL 时进入处理函数，从而导致空指针解引用错误。 修复方法是在安装每个处理程序之前设置反向指针。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1531.006

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf< b86280b12ccf33b68b309b7cb0e4476894dfe77c affected
e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf< 07e50cef557def076418c67051a336e4c6bd50e1 affected
e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf< 17ef63843c0fcbf1efdfbbfb0f5584a5ea2c91ba affected
e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf< d232bc6cf4562132ef50644484dfd4b23a593295 affected
e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf< fac202d73e7a649b7d4010325c6c6dcd9334fe65 affected
e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf< d91fb6c0d10dad32929dc5c6850f89df34e1bfcd affected
e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf< 647217abea849d3d45f8cb0b8ee5b78d50f26985 affected
5.3 affected
… +8 more rows
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I. Basic Information for CVE-2026-89993

Vulnerability Information
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Vulnerability Title
dmaengine: dw-edma: Initialize IRQ data before requesting IRQs
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: dw-edma: Initialize IRQ data before requesting IRQs dw_edma_irq_request() passes struct dw_edma_irq to request_irq() before dw_edma_channel_setup() fills the back pointer. A shared interrupt can therefore enter the handler with dw_irq->dw still NULL, leading to a NULL pointer dereference. Set the back pointer before installing each handler.
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 e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf ~ b86280b12ccf33b68b309b7cb0e4476894dfe77c -
Linux Linux 5.3 -

II. Public POCs for CVE-2026-89993

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III. Intelligence Information for CVE-2026-89993

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Other References for CVE-2026-89993 (6)

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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