CVE-2026-64205: Linux

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: 1f760b87e54cf56a25ab68f8dc625e339f6e46d5 преди 2ef69871b313aa0f02182795f5e0f5aa455f203c; 1f760b87e54cf56a25ab68f8dc625e339f6e46d5 преди ef5a347532932f58748dad485c15039f5168c377; 1f760b87e54cf56a25ab68f8dc625e339f6e46d5 преди bb5133a7d5f3fe5c387770e25f2e00e682ce11ed; 1f760b87e54cf56a25ab68f8dc625e339f6e46d5 преди 00904687b9c5527d569d9a1ca72119823e735a61; 1f760b87e54cf56a25ab68f8dc625e339f6e46d5 преди 10dd1a736d557e310a77117832874729a0175d57
• Linux Linux: 6.3; преди 6.3; 6.6.148 до 6.6.*; 6.12.101 до 6.12.*; 6.18.39 до 6.18.*; 7.1.4 до 7.1.*; от 7.2 нататък

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99265
• CVE-2026-99261
• CVE-2026-99260

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-64205
• https://nvd.nist.gov/vuln/detail/CVE-2026-64205
• https://git.kernel.org/stable/c/2ef69871b313aa0f02182795f5e0f5aa455f203c
• https://git.kernel.org/stable/c/ef5a347532932f58748dad485c15039f5168c377
• https://git.kernel.org/stable/c/bb5133a7d5f3fe5c387770e25f2e00e682ce11ed
• https://git.kernel.org/stable/c/00904687b9c5527d569d9a1ca72119823e735a61
• https://git.kernel.org/stable/c/10dd1a736d557e310a77117832874729a0175d57