Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%

Buy Us a Coffee

CVE-2026-99144— sched_ext: Fix use-after-free of a destroyed user DSQ by a deferred reenqueue

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： sched_ext：修复因延迟重新入队而导致的已销毁用户 DSQ 释放后使用（use-after-free）问题。延迟重新入队操作可能会读取已被释放的用户 DSQ。该请求会保留在其所属 CPU 的延迟队列中，直到 run_deferred() 函数将其取出。而负责释放 DSQ 的 RCU 回调函数假设“宽限期”（grace period）已将该请求冲刷完毕，因此 exit_dsq() 在检查每 CPU 节点时并未持有延迟队列锁。然而，宽限期仅等待当前正在执行的读取操作

AI Predicted 7.8 Difficulty: Moderate Updated Oct 28, 2026

Possible ATT&CK Techniques 2 AI

T1055 · Process Injection T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 6

Vendor	Product	Version Range	Status
Linux	Linux	`84b1a0ea0b7c23dec240783a592e480780efe459< 633f586329bfd9843bf8acf86c95353f4c16e22d`	affected
		`84b1a0ea0b7c23dec240783a592e480780efe459< 069403dff337feb192bfc70fb28ddc8a171e20c1`	affected
		`7.1`	affected
		`< 7.1`	unaffected
		`7.2.13≤ 7.2.*`	unaffected
		`7.3≤ *`	unaffected

Updated Oct 28, 2026

Get alerts for future matching vulnerabilities Log in to subscribe

Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title

sched_ext: Fix use-after-free of a destroyed user DSQ by a deferred reenqueue

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: sched_ext: Fix use-after-free of a destroyed user DSQ by a deferred reenqueue A deferred reenqueue can read a freed user DSQ. The request stays on its CPU's deferred list until run_deferred() takes it, and the RCU callback that frees the DSQ assumes that the grace period has flushed it, so exit_dsq() checks the per-CPU node without the deferred list lock. A grace period waits for readers in flight, not for a pending run_deferred(). A run_deferred() which starts after the grace period began can detach the request right before the callback looks and then read the freed DSQ's id. Cancel the pending requests before the grace period instead. The irq work that frees the DSQ unlinks every CPU's request under the per-CPU deferred list lock, and schedule_dsq_reenq() ignores a new request under the same lock once the id is invalid. Only a run_deferred() that started before the grace period can hold a request, and it runs with IRQs disabled, so the grace period waits for it and nothing touches the DSQ after the callback.

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	84b1a0ea0b7c23dec240783a592e480780efe459 ~ 633f586329bfd9843bf8acf86c95353f4c16e22d	-
Linux	Linux	7.1	-

II. Public POCs for CVE-2026-99144

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-99144

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-99144 (1)

🔗 sched_ext: Fix use-after-free of a destroyed user DSQ by a deferred reenqueue - kernel/git/stable/linux.git - Linux kernel stable tree Read full article

https://www.cve.org/CVERecord?id=CVE-2026-99144

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

CVE-2026-99143		tracing: Keep the predicate limit separate from program capacity
CVE-2026-99129		selinux: fix BPF token permission checks
CVE-2026-99130		io_uring/cancel: don't spin on local work the task can't run
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-2026-99156		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 → →

IV. Related Vulnerabilities

Same product: Linux

Same vendor: Linux