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CVE-2026-89891— media: em28xx: fix use-after-free of dev_next->devlist on disconnect

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，以下漏洞已得到修复： 媒体子系统：em28xx 驱动：修复断开连接时 dev_next->devlist 的“使用已释放内存”（use-after-free）问题 当具有 的设备被探测（probe）且走 路径时， 会将 和 都通过该函数添加到全局列表 中。然而，在断开连接（disconnect）过程中， 仅调用 ，导致 仍保留在全局列表中。随后，当 通过 被释放时，其在全局列表 中的条目就变成了一个悬空指针（dangling pointer）。当下一个设备探测过程调用 时， 检测到该已释放的

AI Predicted 5.5 Difficulty: Hard EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1611 · Escape to Host

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f410b4093fdd4d8f4644d3d486afe3040eceef7b< f61720346fdcc1a2deec59a2f6cbb0cc20d1dc18 affected
f410b4093fdd4d8f4644d3d486afe3040eceef7b< 1ed575b1991f68569eb589b7747d3bc26aa6a8a2 affected
f410b4093fdd4d8f4644d3d486afe3040eceef7b< da4b07da6281e39ce4c01e1227e036f3bf600e14 affected
f410b4093fdd4d8f4644d3d486afe3040eceef7b< 20aacd87550be297dc39a3f9532dcfff91586510 affected
f410b4093fdd4d8f4644d3d486afe3040eceef7b< 20c2c65f3d9f7c278dc9750531d3201ac8bf78b7 affected
f410b4093fdd4d8f4644d3d486afe3040eceef7b< 0782807552b6aff41b4656c6c9076a3231d3e79d affected
f410b4093fdd4d8f4644d3d486afe3040eceef7b< 16cb1ee17e093175b4d9ae33202f68e5b108cca2 affected
f410b4093fdd4d8f4644d3d486afe3040eceef7b< 826915b6b65e2d3251e7248ea54289a22d748c84 affected
… +10 more rows
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I. Basic Information for CVE-2026-89891

Vulnerability Information
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Vulnerability Title
media: em28xx: fix use-after-free of dev_next->devlist on disconnect
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: media: em28xx: fix use-after-free of dev_next->devlist on disconnect When a device with has_dual_ts=1 is probed and the is_audio_only path is taken, both dev and dev->dev_next are added to the global em28xx_devlist via em28xx_init_extension(). However, during disconnect, em28xx_close_extension(dev) only calls list_del(&dev->devlist), leaving dev->dev_next->devlist still linked in the global list. When dev_next is subsequently freed via kref_put(), its devlist entry becomes a dangling pointer in em28xx_devlist. The next device probe that calls em28xx_init_extension() triggers a list corruption BUG when list_add_tail detects the freed node. This bug was exposed by commit a368ecde8a50 ("USB: core: Fix duplicate endpoint bug by clearing reserved bits in the descriptor") which clears reserved bits in bEndpointAddress during endpoint parsing. This causes fuzzed endpoint addresses like 0xf3 to be normalized to 0x83, which em28xx interprets as a vendor audio endpoint, enabling the is_audio_only + has_dual_ts code path that was previously unreachable with such descriptors. Fix this by removing dev->dev_next->devlist from the global list in em28xx_close_extension() before the device is freed.
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 f410b4093fdd4d8f4644d3d486afe3040eceef7b ~ f61720346fdcc1a2deec59a2f6cbb0cc20d1dc18 -
Linux Linux 4.17 -

II. Public POCs for CVE-2026-89891

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III. Intelligence Information for CVE-2026-89891

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Other References for CVE-2026-89891 (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

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Same vendor: Linux

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