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CVE-2026-93097— cxl/mbox: Break poison list loop on an empty payload

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： cxl/mbox: 当载荷为空时，中断毒化列表（poison list）的循环 如果某个设备在每次迭代中均返回 且 标志位被置位， 将永远不会递增，导致 保护机制永远不会触发， 循环因此陷入无限循环，同时一直持有 锁。这会导致由 sysfs 触发的扫描线程挂起，并阻塞该设备上后续的所有毒化（poison）操作。现有的“防止 未清除”的保护逻辑原本旨在限制行为异常的设备，但并未覆盖 的情形。 本次修复在遇到空载荷时直接终止循环，从而防止故障或恶意设备将毒化扫描流程卡死（wed

AI Predicted 5.9 Difficulty: Moderate EPSS 0.20% · P9

Possible ATT&CK Techniques 2 AI

T1012.001 T1078 · Valid Accounts

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux ed83f7ca398b3798b82c1d5d1113011c0e5a2198< 86771c105293ca26bfcc320b4f60d32c137b54aa affected
ed83f7ca398b3798b82c1d5d1113011c0e5a2198< 42eab80981f4d2ac820e253e80ecf92f8cd91f69 affected
ed83f7ca398b3798b82c1d5d1113011c0e5a2198< 6ad491cef1a812cf7b53aa769cd8869516c47362 affected
ed83f7ca398b3798b82c1d5d1113011c0e5a2198< e77594e0cea67ab1c2317a27aa77a744e26ad6a6 affected
ed83f7ca398b3798b82c1d5d1113011c0e5a2198< 8b301c4afbce4bc3f94528441d8d5ce1366504ad affected
6.4 affected
< 6.4 unaffected
6.6.157≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-93097

Vulnerability Information
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Vulnerability Title
cxl/mbox: Break poison list loop on an empty payload
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cxl/mbox: Break poison list loop on an empty payload A device that returns count == 0 with CXL_POISON_FLAG_MORE set on every iteration never advances nr_records, so the max_errors guard never trips and the do/while loops forever while holding poison.mutex. That hangs the sysfs-triggered scan thread and blocks all subsequent poison operations on the device. The existing "Protect against an uncleared _FLAG_MORE" guard was intended to bound a misbehaving device but does not cover the count == 0 case. Stop the loop on an empty payload so a malfunctioning or malicious device cannot wedge the poison scan.
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 ed83f7ca398b3798b82c1d5d1113011c0e5a2198 ~ 86771c105293ca26bfcc320b4f60d32c137b54aa -
Linux Linux 6.4 -

II. Public POCs for CVE-2026-93097

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III. Intelligence Information for CVE-2026-93097

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Patches & Fixes for CVE-2026-93097 (4)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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