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CVE-2025-68760— iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show

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.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于amd iommu驱动中iommu_mmio_write函数边界检查不当，可能导致越界读取。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 7a4ee419e8c144b747a8915856e91a034d7c8f34< b959df804c33913dbfdb90750f2d693502b3d126 affected
7a4ee419e8c144b747a8915856e91a034d7c8f34< 0ec4aaf5f3f559716a6559f3d6d9616e9470bed6 affected
7a4ee419e8c144b747a8915856e91a034d7c8f34< a0c7005333f9a968abb058b1d77bbcd7fb7fd1e7 affected
6.17 affected
< 6.17 unaffected
6.17.13≤ 6.17.* unaffected
6.18.2≤ 6.18.* unaffected
6.19≤ * unaffected
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I. Basic Information for CVE-2025-68760

Vulnerability Information
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Vulnerability Title
iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show In iommu_mmio_write(), it validates the user-provided offset with the check: `iommu->dbg_mmio_offset > iommu->mmio_phys_end - 4`. This assumes a 4-byte access. However, the corresponding show handler, iommu_mmio_show(), uses readq() to perform an 8-byte (64-bit) read. If a user provides an offset equal to `mmio_phys_end - 4`, the check passes, and will lead to a 4-byte out-of-bounds read. Fix this by adjusting the boundary check to use sizeof(u64), which corresponds to the size of the readq() operation.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于amd iommu驱动中iommu_mmio_write函数边界检查不当，可能导致越界读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 7a4ee419e8c144b747a8915856e91a034d7c8f34 ~ b959df804c33913dbfdb90750f2d693502b3d126 -
Linux Linux 6.17 -

II. Public POCs for CVE-2025-68760

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III. Intelligence Information for CVE-2025-68760

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Other References for CVE-2025-68760 (3)

Same Patch Batch · Linux · 2026-01-05 · 16 CVEs total

CVE-2025-68761 7.8 HIGH hfs: fix potential use after free in hfs_correct_next_unused_CNID()
CVE-2025-68764 7.8 HIGH NFS: Automounted filesystems should inherit ro,noexec,nodev,sync flags
CVE-2025-68753 7.1 HIGH ALSA: firewire-motu: add bounds check in put_user loop for DSP events
CVE-2025-68752 iavf: Implement settime64 with -EOPNOTSUPP
CVE-2025-68751 s390/fpu: Fix false-positive kmsan report in fpu_vstl()
CVE-2025-68754 rtc: amlogic-a4: fix double free caused by devm
CVE-2025-68755 staging: most: remove broken i2c driver
CVE-2025-68756 block: Use RCU in blk_mq_[un]quiesce_tagset() instead of set->tag_list_lock
CVE-2025-68757 drm/vgem-fence: Fix potential deadlock on release
CVE-2025-68758 backlight: led-bl: Add devlink to supplier LEDs
CVE-2025-68759 wifi: rtl818x: Fix potential memory leaks in rtl8180_init_rx_ring()
CVE-2025-68762 net: netpoll: initialize work queue before error checks
CVE-2025-68763 crypto: starfive - Correctly handle return of sg_nents_for_len
CVE-2025-68765 mt76: mt7615: Fix memory leak in mt7615_mcu_wtbl_sta_add()
CVE-2025-68766 irqchip/mchp-eic: Fix error code in mchp_eic_domain_alloc()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-68760

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