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CVE-2026-99167— net/sched: fix use-after-free in __tcf_action_put()

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，以下漏洞已被修复： net/sched：修复 __tcf_action_put() 中的释放后使用（use-after-free）问题。 __tcf_action_put() 在减少绑定计数之前先减少了引用计数。另一个线程可能在这两个操作之间释放了该 action 对象，导致更新绑定计数时访问了已被释放的内存。KASAN 报告如下： BUG: KASAN: slab-use-after-free in __tcf_action_put+0x327/0x340 由任务 tc-put-pause

AI Predicted 7.8 Difficulty: Moderate Updated Oct 28, 2026

Possible ATT&CK Techniques 1 AI

T1069 · Permission Groups Discovery

Affected Version Matrix 8

Vendor	Product	Version Range	Status
Linux	Linux	`16af6067392c40e454e49eec834843ab03643d96< 2465d27ef90de9105c2bffb6c35f8ce08918e642`	affected
		`16af6067392c40e454e49eec834843ab03643d96< 2e012e431aa271ef3c84206f48854f539c03bff0`	affected
		`16af6067392c40e454e49eec834843ab03643d96< 7b16eb911091aae237a8673da94e4dfb9cd21d54`	affected
		`4.19`	affected
		`< 4.19`	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

net/sched: fix use-after-free in __tcf_action_put()

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: fix use-after-free in __tcf_action_put() __tcf_action_put() decrements the reference count before decrementing the binding count. Another thread can free the action between these operations, causing the binding-count update to access freed memory. KASAN reports it as: BUG: KASAN: slab-use-after-free in __tcf_action_put+0x327/0x340 Write of size 4 at addr ff11000000d46420 by task tc-put-pause/64 Hold the action IDR mutex across both counter updates and IDR removal, keeping cleanup outside the lock.

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	16af6067392c40e454e49eec834843ab03643d96 ~ 2465d27ef90de9105c2bffb6c35f8ce08918e642	-
Linux	Linux	4.19	-

II. Public POCs for CVE-2026-99167

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-99167

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Patches & Fixes for CVE-2026-99167 (3)

https://www.cve.org/CVERecord?id=CVE-2026-99167

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-2026-99154		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
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-2026-99150		drm/amdgpu: don't drop the runtime PM reference twice in amdgpu_gpr

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

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