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CVE-2026-99130— io_uring/cancel: don't spin on local work the task can't run

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： io_uring/cancel：避免在任务无法执行本地工作时自旋 io_uring_cancel_generic() 函数在退出任务的 tctx 上下文中，若任何 io_uring 环上仍有待处理的本地工作，则拒绝进入睡眠状态。该函数假设当前任务即为该环的提交者，并认为下一轮 io_uring_try_cancel_requests() 调用将执行这些本地工作。然而，这一假设并不适用于在任务通过 io_uring_create() 或 io_ringfd_registe

AI Predicted 7.5 Difficulty: Easy Updated Oct 28, 2026

Possible ATT&CK Techniques 1 AI

T1499.001 · OS Exhaustion Flood

Affected Version Matrix 8

Vendor	Product	Version Range	Status
Linux	Linux	`360cd42c4e95ff06d8d7b0a54e42236c7e7c187f< 94d13387b96e50a4288f7bbdfe401189246a11a1`	affected
		`360cd42c4e95ff06d8d7b0a54e42236c7e7c187f< 3005459e0ddfcef0f555b6e81f672f2c49a1c0aa`	affected
		`360cd42c4e95ff06d8d7b0a54e42236c7e7c187f< fddcf4c5321b3ea5f72166c3fd36a9d1c34f80c7`	affected
		`6.4`	affected
		`< 6.4`	unaffected
		`6.18.59≤ 6.18.*`	unaffected
		`7.2.13≤ 7.2.*`	unaffected
		`7.3≤ *`	unaffected

Updated Oct 28, 2026

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Vulnerability Information

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Vulnerability Title

io_uring/cancel: don't spin on local work the task can't run

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/cancel: don't spin on local work the task can't run io_uring_cancel_generic() refuses to sleep while any ring on the exiting task's tctx has local work pending. It assumes the task is that ring's submitter and that the next io_uring_try_cancel_requests() pass will run the work. This does not hold for a ring that was still IORING_SETUP_R_DISABLED when the task got its tctx node from io_uring_create() or io_ringfd_register(). The submitter is set later by IORING_REGISTER_ENABLE_RINGS, possibly from another task, and only the submitter may run local work on an IORING_SETUP_DEFER_TASKRUN ring. To the exiting task the work stays pending forever, the loop never reaches schedule(), and the task trips the WARN_ON_ONCE() once and then spins in do_exit(). An unprivileged user can set this up at will by creating a disabled ring, having a child enable it and stop, posting to the ring with IORING_OP_MSG_RING and exiting with a request in flight that only the child can complete. The exiting thread burns a CPU until the child runs or dies, and with panic_on_warn set the WARN panics the kernel. Fix by skipping the sleep only when io_allowed_defer_tw_run() allows the task to run the work. This is reasonable since work it cannot run cannot complete any of its requests either, so nothing is lost by sleeping. Drop the WARN_ON_ONCE() since handing a disabled ring to another thread is a supported scenario, not a bug state.

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	360cd42c4e95ff06d8d7b0a54e42236c7e7c187f ~ 94d13387b96e50a4288f7bbdfe401189246a11a1	-
Linux	Linux	6.4	-

II. Public POCs for CVE-2026-99130

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-99130

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Patches & Fixes for CVE-2026-99130 (1)

🔗 io_uring/cancel: don't spin on local work the task can't run - kernel/git/stable/linux.git - Linux kernel stable tree Read full article

https://www.cve.org/CVERecord?id=CVE-2026-99130

Same Patch Batch · Linux · 2026-10-28 · 117 CVEs total

CVE-2026-99144		sched_ext: Fix use-after-free of a destroyed user DSQ by a deferred reenqueue
CVE-2026-99129		selinux: fix BPF token permission checks
CVE-2026-99131		xfs: fix capability check in xfs
CVE-2026-99133		net/iucv: fix the recvmsg window update
CVE-2026-99132		xfs: don't hold buffer locks across sync transaction commit in xfs_sync_sb_buf
CVE-2026-99134		mac802154: fix data race and NULL deref on local->assoc_dev
CVE-2026-99135		dm-integrity: fix infinite loop on discard with large tag size
CVE-2026-99137		cifs: don't update i_size in cifs_do_truncate without a cached handle
CVE-2026-99136		dm-crypt: fix a tiny race condition in crypt_dec_pending
CVE-2026-99138		tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)
CVE-2026-99140		tracing: Fix hist trigger timestamps for buffered events
CVE-2026-99139		tcp: fix use-after-free in do_tcp_getsockopt(TCP_CONGESTION)
CVE-2026-99141		tracing: Fix crash in print_graph_function_event()
CVE-2026-99142		tracing: Check operator stack capacity before pushing
CVE-2026-99143		tracing: Keep the predicate limit separate from program capacity
CVE-2026-99156		scsi: st: Fix use-after-free race between st_remove() and st_open()
CVE-2026-99153		scsi: libiscsi: Validate the ITT reflected in a Reject PDU
CVE-2026-99152		scsi: libiscsi: Validate the task named by a management response
CVE-2026-99154		scsi: libiscsi: Reject a negative task index from parse_pdu_itt
CVE-2026-99151		drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions

Showing top 20 of 117 CVEs. View all on vendor page → →

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