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CVE-2026-89823— drm: fix race between partial drm_dev_register() failure and ioctl

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，已解决以下漏洞： drm：修复 drm_dev_register() 部分失败与 ioctl 操作之间的竞态条件 如果 在注册 minor 设备后失败（例如：渲染节点已注册，但主设备节点注册失败），用户空间可能已经打开了第一个 minor 设备，并进入了 的关键区段。由于 标志从未被设置， 会在错误处理路径释放设备资源的同时继续执行，从而产生竞态条件。 该问题通过引入 函数来修复。该函数会设置 标志，并等待 SRCU（Sleepable RCU）屏障，确保所有正在进行的 关键区段在执行清理操

CVSS 7.8 · High EPSS 0.17% · P6

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux bee330f3d67273a68dcb99f59480d59553c008b2< 26d9162213952927cd59c0d94b7e0e992b347bec affected
bee330f3d67273a68dcb99f59480d59553c008b2< 24d28d15c0f7f7d4a1c229f8730314f0f8758810 affected
bee330f3d67273a68dcb99f59480d59553c008b2< 6729990df9e70623bf53f855b521ae71ca9cb278 affected
bee330f3d67273a68dcb99f59480d59553c008b2< a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c affected
bee330f3d67273a68dcb99f59480d59553c008b2< 19dbfe4d586aecfed121cb3fa62281761d9d341f affected
bee330f3d67273a68dcb99f59480d59553c008b2< 79d09cfe90304ff4f195e47d569800f5e0f8b854 affected
bee330f3d67273a68dcb99f59480d59553c008b2< 2d1215a72159d00001e08dee162e27718934bee9 affected
bee330f3d67273a68dcb99f59480d59553c008b2< eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e affected
… +10 more rows
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I. Basic Information for CVE-2026-89823

Vulnerability Information
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Vulnerability Title
drm: fix race between partial drm_dev_register() failure and ioctl
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm: fix race between partial drm_dev_register() failure and ioctl If drm_dev_register() fails after registering a minor (e.g. render minor registered, primary minor fails), userspace could have opened the first minor and entered a drm_dev_enter() critical section. Since the unplugged flag was never set, the ioctl proceeds while the error path tears down device resources. Fix this by introducing drm_dev_synchronize_unplug(), which sets the unplugged flag and waits for the SRCU barrier, ensuring all in-flight drm_dev_enter() critical sections complete before cleanup proceeds; call it on the error path of drm_dev_register().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 bee330f3d67273a68dcb99f59480d59553c008b2 ~ 26d9162213952927cd59c0d94b7e0e992b347bec -
Linux Linux 4.18 -

II. Public POCs for CVE-2026-89823

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III. Intelligence Information for CVE-2026-89823

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Other References for CVE-2026-89823 (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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