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CVE-2026-89769— clocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_state error path

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，已解决以下漏洞： clocksource/drivers/nxp-pit：修复 cpuhp_setup_state 错误路径下的 IRQ 泄漏 当 成功调用 后，若 失败，错误处理会直接跳转到 ，而未释放已注册的 IRQ。 这会导致 IRQ 线泄漏，且由于随后执行 ，使得已注册为中断处理程序 的指针变为悬空指针。如果之后该 IRQ 再次触发，可能会导致释放后使用（use-after-free）问题。 修复方法是：在落入现有清理流程之前，调用 以正确释放 IRQ。

AI Predicted 5.5 Difficulty: Hard

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux bee33f22d7c30626e711b4900e3f460b6e0e104f< d53c29a89a15e56a1797f3ef249955e544782e04 affected
bee33f22d7c30626e711b4900e3f460b6e0e104f< cdcd861123248e871c2ec2be968b0a1b2a5a34b0 affected
bee33f22d7c30626e711b4900e3f460b6e0e104f< 05520e035f8332c8e33f3011b5ca016fde61793d affected
6.18 affected
< 6.18 unaffected
6.18.50≤ 6.18.* unaffected
7.2.4≤ 7.2.* unaffected
7.3-rc1≤ * unaffected
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I. Basic Information for CVE-2026-89769

Vulnerability Information
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Vulnerability Title
clocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_state error path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: clocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_state error path When cpuhp_setup_state fails after pit_clockevent_per_cpu_init has successfully called request_irq, the error handling jumps directly to out_pit_clocksource_unregister without freeing the registered IRQ. This leaks the IRQ line and, since kfree(pit) follows, leaves a dangling pointer registered as the interrupt handler's dev_id, potentially leading to a use-after-free if the IRQ fires afterwards. Fix it by calling pit_clockevent_per_cpu_exit to properly release the IRQ before falling through to the existing cleanup chain.
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 bee33f22d7c30626e711b4900e3f460b6e0e104f ~ d53c29a89a15e56a1797f3ef249955e544782e04 -
Linux Linux 6.18 -

II. Public POCs for CVE-2026-89769

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III. Intelligence Information for CVE-2026-89769

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Other References for CVE-2026-89769 (3)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89491 ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
CVE-2026-89477 sctp: fix NULL deref on untransmitted RECONF completion
CVE-2026-89478 sctp: drop a chunk if its transport was removed
CVE-2026-89479 sctp: stop processing a packet once its association is deleted
CVE-2026-89480 nvme-tcp: reject a read that transferred too few bytes
CVE-2026-89482 nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89481 nvme-tcp: fix host memory disclosure on R2T for a read command
CVE-2026-89483 nvme: zero the discard fallback page
CVE-2026-89484 lockd: fix NULL dereference on lockowner allocation failure
CVE-2026-89485 lockd: pin next file across nlm_inspect_file lock-drop
CVE-2026-89486 ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()
CVE-2026-89487 openvswitch: only skb_tx_error() a packet we are about to drop
CVE-2026-89488 openvswitch: Fix CT limit teardown use-after-free
CVE-2026-89489 openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
CVE-2026-89500 ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
CVE-2026-89497 orangefs: skip leading spaces before parsing client debug masks
CVE-2026-89498 orangefs: fix double-free of trailer_buf on readdir copy failure
CVE-2026-89499 ring-buffer: Stop remote reader update when page swap fails
CVE-2026-89496 ocfs2: always run deallocs on copy-on-write completion
CVE-2026-89501 ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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