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CVE-2026-98094— staging: fbtft: make dirty_lock IRQ-safe

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，已修复以下漏洞： staging: fbtft: 使 dirty_lock 具备中断安全性（IRQ-safe） 当在硬中断上下文处理 时， 可能会通过 fbcon 渲染路径被调用。与此同时， 在开启本地中断的工作队列上下文中也会获取 。 锁依赖检测工具（Lockdep）报告了涉及 和 的可能中断锁倒置（IRQ lock inversion）问题。一个硬中断可以中断持有 的 CPU，并进入控制台渲染路径，进而尝试再次获取 。 在启用 的 RK3566 系统上观察到了以下锁依赖报告： 解决方案：

AI Predicted 5.3 Difficulty: Easy EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c296d5f9957c03994a699d6739c27d4581a9f6c7< 0843298b159599ee7bc6d14800efdb4bc7349706 affected
c296d5f9957c03994a699d6739c27d4581a9f6c7< a323066337ed85c38decfc7f6bbf42f27605dff1 affected
c296d5f9957c03994a699d6739c27d4581a9f6c7< f2451e18826eb6a33ea51419f39bdd2eb99fa1ea affected
c296d5f9957c03994a699d6739c27d4581a9f6c7< 10cc145b873670438d3b105133dffdae70822db6 affected
c296d5f9957c03994a699d6739c27d4581a9f6c7< 2a609e29efbba79f9abd68c4ec8a2bd7ecf291e7 affected
c296d5f9957c03994a699d6739c27d4581a9f6c7< f0c869df2c33793c8828acaab3e4a5e0176f9f00 affected
c296d5f9957c03994a699d6739c27d4581a9f6c7< dcb48fde8003492256dee45815144aa5ed26ce7c affected
c296d5f9957c03994a699d6739c27d4581a9f6c7< f576944a59f31bcffff121117ebf452c5dd162b7 affected
… +10 more rows
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I. Basic Information for CVE-2026-98094

Vulnerability Information
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Vulnerability Title
staging: fbtft: make dirty_lock IRQ-safe
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: staging: fbtft: make dirty_lock IRQ-safe fbtft_mkdirty() can be reached from the fbcon rendering path while processing printk() in hardirq context. Meanwhile, dirty_lock is also taken by fbtft_deferred_io() in workqueue context with local interrupts enabled. Lockdep reports a possible IRQ lock inversion involving dirty_lock and console_owner. A hardirq can interrupt a CPU holding dirty_lock and enter the console rendering path, which can attempt to acquire dirty_lock again. The following lockdep report was observed on an RK3566 system with CONFIG_PROVE_LOCKING enabled: WARNING: possible irq lock inversion dependency detected swapper/2/0 just changed the state of lock: (console_owner){-...}-{0:0} but this lock took another, HARDIRQ-unsafe lock in the past: (&par->dirty_lock){+.+.}-{2:2} CPU0 CPU1 ---- ---- lock(&par->dirty_lock); local_irq_disable(); lock(console_owner); lock(&par->dirty_lock); <Interrupt> lock(console_owner); *** DEADLOCK *** Use spin_lock_irqsave() for fbtft_mkdirty() and spin_lock_irq() for fbtft_deferred_io(). They only access the dirty line range, so the IRQ-off regions remain short.
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 c296d5f9957c03994a699d6739c27d4581a9f6c7 ~ 0843298b159599ee7bc6d14800efdb4bc7349706 -
Linux Linux 4.0 -

II. Public POCs for CVE-2026-98094

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III. Intelligence Information for CVE-2026-98094

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Patches & Fixes for CVE-2026-98094 (8)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation
CVE-2026-97575 7.8 HIGH media: v4l2-ctrls: validate AV1 tile counts
CVE-2026-97576 7.8 HIGH media: v4l2-ctrls: validate HEVC tile counts
CVE-2026-97941 7.8 HIGH mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-97937 7.8 HIGH ftrace: fork: Initialize function graph state before copy_exec_state()
CVE-2026-97580 7.8 HIGH media: rkvdec: bound HEVC tile loops and PPS id to the array capacity
CVE-2026-97940 7.8 HIGH ipv6: fix fib6 walker UAF on seq stop

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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