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CVE-2026-64205— i2c: i801: fix hardware state machine corruption in error path

AI Predicted 5.5 Difficulty: Moderate EPSS 0.12% · P3

Affected Version Matrix 12

VendorProductVersion RangeStatus
LinuxLinux1f760b87e54cf56a25ab68f8dc625e339f6e46d5< 2ef69871b313aa0f02182795f5e0f5aa455f203caffected
1f760b87e54cf56a25ab68f8dc625e339f6e46d5< ef5a347532932f58748dad485c15039f5168c377affected
1f760b87e54cf56a25ab68f8dc625e339f6e46d5< bb5133a7d5f3fe5c387770e25f2e00e682ce11edaffected
1f760b87e54cf56a25ab68f8dc625e339f6e46d5< 00904687b9c5527d569d9a1ca72119823e735a61affected
1f760b87e54cf56a25ab68f8dc625e339f6e46d5< 10dd1a736d557e310a77117832874729a0175d57affected
6.3affected
< 6.3unaffected
6.6.148≤ 6.6.*unaffected
… +4 more rows
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I. Basic Information for CVE-2026-64205

Vulnerability Information
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Vulnerability Title
i2c: i801: fix hardware state machine corruption in error path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: i2c: i801: fix hardware state machine corruption in error path A severe livelock and subsequent Hung Task panic were observed in the i2c-i801 driver during concurrent Fuzzing. The crash is caused by an unconditional hardware register cleanup in the error handling path of i801_access(). When i801_check_pre() fails (e.g., returning -EBUSY because the SMBus controller is actively used by BIOS/ACPI), the kernel does not actually acquire the hardware ownership. However, the code jumps to the 'out' label and executes: iowrite8(SMBHSTSTS_INUSE_STS | STATUS_FLAGS, SMBHSTSTS(priv)); This forcefully clears the INUSE_STS lock and resets the hardware status flags without owning the controller. Doing so interrupts ongoing BIOS/ACPI transactions and totally corrupts the SMBus hardware state machine. Consequently, all subsequent i801_access() calls fail at the pre-check stage, triggering an endless stream of "SMBus is busy, can't use it!" error logs. Over a slow serial console, this printk flood monopolizes the CPU (Console Livelock), starving other processes trying to acquire the mmap_lock down_read semaphore, ultimately triggering the hung task watchdog. Fix this by moving the 'out' label below the hardware register cleanup. If i801_check_pre() fails, we safely bypass the iowrite8() and only release the software locks (pm_runtime and mutex), strictly adhering to the rule of not releasing resources that were never acquired.
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基金会开源的一款操作系统内核。 Linux kernel 6.3版本存在安全漏洞，该漏洞源于i801_access()错误处理路径中对硬件寄存器无条件清理，可能导致控制器在被BIOS/ACPI使用时强制清除INUSE_STS锁并重置状态标志，进而中断正在进行的传输、损坏SMBus硬件状态机，最终引起内核活跃锁及Hung Task崩溃。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 1f760b87e54cf56a25ab68f8dc625e339f6e46d5 ~ 2ef69871b313aa0f02182795f5e0f5aa455f203c -
LinuxLinux 6.3 -

II. Public POCs for CVE-2026-64205

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III. Intelligence Information for CVE-2026-64205

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Patches & Fixes for CVE-2026-64205 (5)

Same Patch Batch · Linux · 2026-07-20 · 9 CVEs total

CVE-2026-642068.8 HIGHBluetooth: L2CAP: cancel pending_rx_work before taking conn->lock
CVE-2026-641887.8 HIGHnet: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()
CVE-2026-641897.8 HIGHnetfilter: ipset: fix race between dump and ip_set_list resize
CVE-2026-641917.8 HIGHi2c: stub: Reject I2C block transfers with invalid length
CVE-2026-64187xfs: fail recovery on a committed log item with no regions
CVE-2026-64190net: team: fix NULL pointer dereference in team_xmit during mode change
CVE-2026-64192bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized
CVE-2026-64207net/sched: dualpi2: fix GSO backlog accounting

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64205

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