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CVE-2026-53321— io_uring/napi: cap busy_poll_to 10 msec

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.

Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel 6.9版本存在安全漏洞，该漏洞源于io_uring/napi缺少繁忙轮询上限，可能导致任务卡住并触发内核警告。

AI Predicted 3.3 Difficulty: Moderate EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5< 39767f944a8c9e696566c37ad5b20131406c4b8d affected
8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5< cb3af525f8dfb8930f0c123e5755fa967a12d5c1 affected
8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5< df8599ee18c0e5fe343ffe0b4c379636b8bb839a affected
6.9 affected
< 6.9 unaffected
6.18.33≤ 6.18.* unaffected
7.0.10≤ 7.0.* unaffected
7.1≤ * unaffected
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I. Basic Information for CVE-2026-53321

Vulnerability Information
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Vulnerability Title
io_uring/napi: cap busy_poll_to 10 msec
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: io_uring/napi: cap busy_poll_to 10 msec Currently there's no cap on the maximum amount of time that napi is allowed to poll if no events are found, which can lead to kernel complaints on a task being stuck as there's no conditional rescheduling done within that loop. Just cap it to 10 msec in total, that's already way above any kind of sane value that will reap any benefits, yet low enough that it's nowhere near being able to trigger preemption complaints.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel 6.9版本存在安全漏洞，该漏洞源于io_uring/napi缺少繁忙轮询上限，可能导致任务卡住并触发内核警告。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5 ~ 39767f944a8c9e696566c37ad5b20131406c4b8d -
Linux Linux 6.9 -

II. Public POCs for CVE-2026-53321

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III. Intelligence Information for CVE-2026-53321

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Patches & Fixes for CVE-2026-53321 (3)

Same Patch Batch · Linux · 2026-06-26 · 47 CVEs total

CVE-2026-53309 9.8 CRITICAL ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison
CVE-2026-53281 8.8 HIGH iommu/vt-d: Avoid NULL pointer dereference or refcount corruption
CVE-2026-53322 8.8 HIGH vfio/pci: Clean up DMABUFs before disabling function
CVE-2026-53300 7.8 HIGH net: enetc: fix NTMP DMA use-after-free issue
CVE-2026-53290 7.8 HIGH drm/xe/eustall: Fix drm_dev_put called before stream disable in close
CVE-2026-53284 7.5 HIGH btrfs: only release the dirty pages io tree after successful writes
CVE-2026-53310 soc/tegra: cbb: Fix cross-fabric target timeout lookup
CVE-2026-53324 net: mana: Use pci_name() for debugfs directory naming
CVE-2026-53318 wifi: mt76: mt7925: prevent NULL pointer dereference in mt7925_tx_check_aggr()
CVE-2026-53320 nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()
CVE-2026-53319 blk-wbt: remove WARN_ON_ONCE from wbt_init_enable_default()
CVE-2026-53323 net: dsa: remove redundant netdev_lock_ops() from conduit ethtool ops
CVE-2026-53312 iommu/riscv: Remove overflows on the invalidation path
CVE-2026-53311 fuse: fix uninit-value in fuse_dentry_revalidate()
CVE-2026-53304 scsi: sg: Resolve soft lockup issue when opening /dev/sgX
CVE-2026-53308 power: supply: max77705: Free allocated workqueue and fix removal order
CVE-2026-53307 pinctrl: pinconf-generic: Fully validate 'pinmux' property
CVE-2026-53305 usb: typec: ps883x: Fix Oops at unbind
CVE-2026-53306 tty: hvc_iucv: fix off-by-one in number of supported devices
CVE-2026-53301 reset: amlogic: t7: Fix null reset ops

Showing top 20 of 47 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53321

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