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CVE-2026-99159— ring-buffer: Fix the sub-buffer array base in rb_meta_subbuf_idx()

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： ring-buffer：修复 rb_meta_subbuf_idx() 中子缓冲区数组基地址的错误在持久化环形缓冲区（persistent ring buffer）中，rb_meta_subbuf_idx() 可能返回一个比实际值高出一个子缓冲区的索引。随后，rb_setup_ids_meta_page() 会将 subbuf_ids[] 数组整体偏移一个位置，导致 subbuf_ids[0] 为 NULL。当用户空间映射 trace_pipe_raw 时，__rb_

AI Predicted 5.5 Difficulty: Hard Updated Oct 28, 2026

Possible ATT&CK Techniques 3 AI

T1055 · Process Injection T1059 · Command and Scripting Interpreter T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 8

Vendor	Product	Version Range	Status
Linux	Linux	`b14d032973d4e6c36e025e96ea3437de53d072d9< 2f1248b728b56d583ea454fedf239550c49f7b18`	affected
		`b14d032973d4e6c36e025e96ea3437de53d072d9< 7469b3585ef5f65840d467d2caa811a9098c84b9`	affected
		`b14d032973d4e6c36e025e96ea3437de53d072d9< 25132363c723afc39aace8b098f547ab4a0ea759`	affected
		`6.12`	affected
		`< 6.12`	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

ring-buffer: Fix the sub-buffer array base in rb_meta_subbuf_idx()

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix the sub-buffer array base in rb_meta_subbuf_idx() On a persistent ring buffer, rb_meta_subbuf_idx() can return an index one sub-buffer too high. rb_setup_ids_meta_page() then fills subbuf_ids[] shifted by one and leaves subbuf_ids[0] NULL, which __rb_map_vma() dereferences when userspace maps trace_pipe_raw. rb_update_meta_reader() writes two such indices into meta->buffers[], which rb_cpu_meta_valid() would reject on the next boot, discarding the previous boot's trace. A CPU's sub-buffer array starts after its meta header and the nr_subbufs integers that follow, aligned up to a sub-buffer. rb_meta_subbuf_idx() inverts that calculation but skips only the integers, not the header, so its base is one sub-buffer low whenever the omitted header size crosses the alignment boundary. Invert the calculation with rb_subbufs_from_meta() rather than repeating it. rb_range_buffer() maps an index back to an address through the same helper, so the two directions can no longer disagree.

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	b14d032973d4e6c36e025e96ea3437de53d072d9 ~ 2f1248b728b56d583ea454fedf239550c49f7b18	-
Linux	Linux	6.12	-

II. Public POCs for CVE-2026-99159

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-99159

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Patches & Fixes for CVE-2026-99159 (3)

https://www.cve.org/CVERecord?id=CVE-2026-99159

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 → →

IV. Related Vulnerabilities

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Same vendor: Linux